
Cuda-W Concept |
Cuda-W
Final Construction
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Cuda-W 2006 |
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| By Warren
Beauchamp |
This page shows the
final construction of the Cuda-W. This streamliner has been in the
making since 2000, when I first started the fairing design
process. The links below detail
the design and construction work that has led to this point.
Cuda-W
design
Cuda-W
Body construction
Cuda-W
drivetrain design & construction (2005)
Cuda-W drivetrain II (2006)
Cuda-W drivetrain III (2008) |
3/24/05
I picked up the fairing at Reg Rodaro's house in Canada on the weekend of
the 19th. It's very cool.
Here it is with the canopy liner
sitting on top of the fairing. It looks like the canopy will
integrate with the fairing with a minimum of hassle.
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From the front you can
see what a nice job Reg did in rounding the sides of the vehicle.
This rounding reduces the effects of side winds.
It's still unknown just how fast
this bike will be, or how well it will handle cross winds.
There's still a lot of work to do,
as only one side of the bulkheads have been attached to the inside
of the body. It's still too cold out to do epoxy work, but very
soon it will be warm enough to allow the epoxy to set up properly
in a foam enclosure heated by a small space heater.
Reg is building a mold of the top
half (or bottom depending how you look at it, the fairing is
symmetrical) of the fairing, that he'll use to build the wheel
fairings and canopy mounts.
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| Here's the fairing with
the canopy removed. The front sub frame will be installed through
this opening, and I'll have to climb in through it as well. It
will be a bit of a acrobatic feat until I get the landing gear
installed. |
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4/18/05
A couple weekends ago I build a set of fairing stands, to allow me
to work on the fairing with fear of it falling over. They turned
out to be heavy duty, so I decided to see if I could climb in a do
a test fit of the engine (me!). I gingerly stepped into the bike,
listening for any creaks or cracks, but it was quiet, so I climbed
in. Woo-Hoo! I fit! There is plenty of length between the seat
bike and front bulkhead, so I don't have to worry about my toes
hitting the bulkhead.
Also the fairing is plenty deep, so
deep that I had to sit up straighter just to see out. I did notice
that the bottom of the fairing is a bit narrow for my butt, that
means I'll need to build a seat bottom into the fairing. This is
actually ok, as I was planning to do that anyway. It's best to
have the seat tilt up in front a bit so you don't slide off.
I tested out the canopy too. Looks
like that should work out fine. I had about 3 fingers between my
head and the inside of the canopy, which should be enough space
for my helmet without too much cramming.
I now have to
work on the drivetrain to complete it and integrate it with
the new fairing.
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7/04/05
The drivetrain has now been
completed enough to take the bike on it's maiden voyage. That was
a trip across the parking lot, but was enough to tell me that it
starts, stops and handles well at low speeds. I met my goal of
"rolling by the Northbrook races", but it still needs
some tweaking before I can race it. As I feared, the frame lacks
some lateral rigidity, so the front wheel has too much side to
side play in the wheel hole. |
I have a
couple things to try to stiffen it up. I'm using a thin wall
7/8" aluminum tube for the subframe's "T" bracket,
which may be flexing. I'll try to find a steel tube to use. Dana
Barlow has recommended a suspension linkage design for the back of
the frame to stiffen it up back there.
Also, the canopy needs to
be mounted and I need to mount a rear brake. The list goes on. I have
a couple more days to work on it before the Northbrook races, but
it looks like I may be racing the old Barracuda.
7/29/05
I raced the old Barracuda at Northbrook, but whether due to
the vehicle or the engine, I was beaten by Rick Gritters, and even
lapped. I'm hoping the new bike is enough faster to close that
gap...
It's been too hot to work out in the barn for the last few weeks, but it's looks like this weekend should be cool enough. I verified that the frame does
still twist and move side to side a bit (though not as much side to side movement of the front wheel after I tightened the steer tube!). I will be building the rear frame mount reinforcement
this weekend, but I need to get my torch bottles refilled. Arg! I added the brake cable guides for the rear brakes,
and have confirmed that the shock does not deflect at all when I get into the bike (!). Now I just need to confirm that the bike sits level and I can mount the rear wheel at the right height and then epoxy the brake bridge into place. Whew! Once I get all that stuff done, I think it will be ready to race next
weekend at the North Indiana HPV races, with the Cuda-W configured
just like the picture above, no canopy. I have not added any chain keepers to the drivetrain yet either. Hopefully I'll have time to do that.
I don't want any lost chains in the middle of the race!
8/03/05
The rear brake bridge is now installed, and I added some spiffy CF
tube chunks to use a cable guides, which worked out nicely.
I decided to add a single tube
between the frame at the bottom of the suspension shock, and the
side of the fairing to triangulate the rear of the front
sub-frame. This should prevent the side to side movement back
there, but still allow the up-down. I think that the side to side
movement was causing the worst part of the lateral wheel movement.
If after the test ride it's still bad, I'll need to build a whole rear frame mount reinforcement
assembly.
I also reinforced the inside of the
seam between the right and left halves of the fairing. Now I just
have to put it all back together and take it for a test ride. It's
much tougher getting in and out of this bike than the old Cuda,
which makes going on self-supported test rides difficult. That's
mostly because there is no landing gear, but partly because it's a
tight fit!
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8/5/05
I added a chain-keeper to the top of the fork portion of the
drivetrain. My "shake and pedal" testing showed that
this was the only place that the chain would drop off. |
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Did some
"machining" (hack saw and files) of the rear dropouts
that Reg made to cut down the weight and adjust for slight
bulkhead misalignment. Heavy duty! |
8/20/05
I raced the Cuda-W at the Northern Indiana HPRA races, and learned
quite a bit about what I still need to do before Battle Mountain,
as well as some things not to do on a bike that's supposed to be
able to go around corners.
The bike now has some scrapes that
will need to be fixed up before Battle Mountain, but other than
that is fine.
Things I learned: |
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- One of my feet hits the front
"T" bracket, so I have to move the clamp there.
- My leg hits the rear shock brace
that I just added on the backstroke, so I need to move that
back further.
- My left leg bounces off the
remote steering rod, causing it to graze the inside of the
fairing. I need to make a new one out of something stiff with
a bend in it to accommodate my leg.
- My right leg grazes the
drivetrain gears, but I think that's because of the other
stuff it's hitting...
- Because the Q is so narrow, and
I have about 1" of crank to tire overlap, if I turn the
bike when my inside foot is in the down position, the tire
hits the crank, which caused some crashes.
- The Cuda-W bounces over 6"
high concrete curbs nicely while sliding backwards on it's
side at a high rate of speed. Kids, don't try this at home...
This is OK for Battle Mountain as it's a straight line run,
but I'll need to build a different drivetrain or use really
short cranks if I want to race this bike in the HPRA races.
- If I hold my inside foot in the
up position, the bike corners nicely, and feels very stable at
speed, but if I start pedaling too soon out of the corner, my
heels strike the fork and sometimes kick the chain off.
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9/12/05
I had a slight digression to build
an HPB and race it. With that out of my system, it's back to
working on the Cuda-W. 3 weeks 'till BM, yikes! I have cut the
hole in the canopy and determined that my head and helmet really
will fit under the bubble. I also obtained some 140mm cranks from
Larry Z. (Thanks Larry!), which have fixed the most of the issues
listed above. They have a bit wider Q than the black widow 155mm
cranks I was using previously, but hopefully they will not be too
wide.
More digression:
I have a surplus silk drogue that's about 6 feet in diameter that I am planning to utilize as an emergency chute on the Cuda-W (Not this year!). Through a series of extensive calculations and rigorous testing I have determined that this chute will work well to stop a high speed HPV in a safe manner. OK, so really I'm just guessing, but the chute can't be much bigger than 6 feet or it either wouldn't open, or
it would tear the back of the bike off when it pops open. Smaller than 3 feet may not slow the bike down fast enough. Remember the chute will be released when the bike
has crashed and is sliding along the ground on it's side, so would need to pop open while being dragged at approximately ground level. Also it will need to deploy very quickly, since the bike begins to spin as soon as it hits the ground. If it pops out when you are going backwards, it won't deploy too well. NASCAR uses pop out spoilers which deploy when the car is sliding backwards to prevent the vehicle from going airborne. Something like that would help prevent the sliding backwards issue, but that's probably too complex and lossy for HPVs. Also what determines when the chute pops out? An automatic system would be nice, but you don't want it deploying during a starting mishap. A manual release is probably the best idea for now, but the pilot would need to pop the chute quickly!
9/21/05
I noticed I still had to modify the drivetrain to gear it up for
70MPH+ capability. I need to add a 32 tooth cog to the
intermediary gear to get to 70MPH at 100RPM. I found a suitable
gear and tried to drill some mounting holes in it, but could not.
I ruined 3 or 4 drill bits before giving up. After asking on the
web I decided to use the heat to un-harden method. I torched it
until it was red hot in the areas I was attempting to drill holes.
It warped the cog nicely, AND when it cooled it was still too hard
to drill. Arg! I found a 28 tooth cog that drilled out just fine,
but that one will only get me to 70MPH at 120 RPM (the same RPM
that I was going when I went 58 MPH in the Barracuda a couple
years ago). Later I tried a titanium coated drill bit, which
dulled as fast as the normal bit, then found a carbide drill bit,
which cut through the cog fine. Now I know to use carbide bits
when drilling cogs!
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On a positive note, over the past weekend I built a base for the back half of the head
bubble, and glassed the Kevlar bubble Reg had made earlier to the
canopy. It faired in pretty well but I will still have a bunch of
filling and sanding to do to make it pretty. |
| The
rear wheel fairing that Reg had been working on also arrived over
the weekend. It looks great and fits well too. I bonded it onto
the rear wheel fairing last night. Now I have a ton of body work
to do to get rid of the seams and scratches in the fairing and
it's associated bits. |
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Here's the
back view. Hmm, apparently I need to trim the canopy flange so it
looks more symmetric, and yes, I'm taking the numbers off for the
BM event.. |
| Also I made a sandwich of 3 layers
of super thick Chinese carbon cloth, which I will cut into strips
to use for canopy alignment tabs. I laid the carbon on a sheet of
plastic wrap, wetted out the carbon, placed another layer of
plastic wrap over the top, then sandwiched it all between two
sheets of 1/2" plywood and put a couple 10 lb weights on top.
It's no vacuum bag, but it should all be integrated together
pretty well, and the excess resin gets squished out the sides.
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9/25/05
4 more days to work on the bike before I have to take the bike to
meet Thom Ollinger, who is graciously driving a bunch of 'liners to
Nevada. Actually 4 evenings. Time to put this mess in high gear!
Here are the tabs made from the
carbon fiber sandwich above. I attached them to the fairing with
epoxy/cotton flox.
I use epoxy in 3 basic types of
composite. To wet out fabric, with cotton flox for structural joins,
and with micro ballons for body work (home made body putty.
Versatile stuff... |
| The tabs
were clamped in the canopy area to keep the canopy positioned
correctly. Putting half of the tabs on the main body, and the other
half on the canopy itself, keeps the canopy from falling into the
bike, or sliding off the outside. |
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After
applying a layer of micro ballons to the seams, and then belt
sanding it back off, I sprayed the fairing with white sandable
primer. That made it easier to see the worst of the spots that
needed more body filler. I
doubt the body will be completely done by Friday, but I'll take some
sandpaper and cans of yellow paint to make it the proper color at
the races next
week. |
| I built the
first wheelcover for the front wheel using Alan A's wheel disk mold.
I made it with 1 layer of carbon fiber that was pressed between 2
layers of plastic wrap, and then mashed together with some weighted
foam. It needs a little sanding, but otherwise turned out well.
Yeah, vacuum bagging it would have made it lighter, but with just 1
layer of CF, the extra epoxy gives it a bit more strength. I had to
cut a slice out of the disk to make it fit the dish of the Rohlhoff
wheel. I put it back together with more CF and epoxy, which is that
messy area you see toward the bottom of the photo. |
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9/28/05
Finished making and mounting the front wheel disks. I mounted them
with zip ties. There is no hole for the valve stem, but I can bend
the disk back to access it. They came out pretty nicely, but
need to be sanded and painted eventually. I glued some magnets to
the inside of the CF disk to use for the speedometer. The magnetic
lines of flux seem to get through the single layer of CF just
fine. I used JB-Weld to glue them, and apparently JB-Weld has a
bunch of iron oxide in it, as when I stuck the magnets into the
epoxy, the epoxy got sucked up onto the sides of the magnet. It
was weird looking.
I stuck the frame back into the
body. Clearances are much better with the shorter cranks, but now
my feet rub a little on the sides of the fairing. Arg! Upon closer
inspection, they were rubbing on the end of the main rib, so I
took the frame back out and spent too much time cutting away about
2" of rib on each side. Much better. Now I can flail away
inside the fairing and crank up the drivetrain to a virtual 70
MPH. Hmm. There is quite a bit of vibration from the front wheel
at that speed. It will need to be balanced. Hopefully that's
something I can do at BM.
I cut the hole in the front of the
head bubble, put on my helmet and sealed myself in. It's very
tight. My head touches the top of the canopy. I discovered I will
need to "assume the position" of head tilted back to be
able to see out of the bike properly (see pictures of Sam in the
Varna). I'm crammed into this thing like a big lanky sardine. It
should be fast!
I bought the Econo-Kote (AeroKote)
film to that I will use to make a wheel disk out out the 700C
tri-spoke CF wheel I have. It should be pretty cool.
Battle
Mountain 2005
Sean Costin and I flew out to Reno, and Garrie Hill graciously
gave us a ride to Battle Mountain. Sunday we got settled in the
hotel, had the first racers meeting, and got our speedbike support
crews worked out.
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11/08/05
I spent most of the first 3 days at the World Human Powered Speed
Championships in Battle Mountain, NV out in the parking lot,
tweaking and fixing the Cuda-W. I
have to give a big thanks to Rob Hitchcock for helping me out all
week by carting me (and my bike!) around and acting as my crew
chief, and to Mike Sovo for being my 2nd crew member.
At the qualification runs on Monday
I couldn't keep the bike above 20MPH. My knees hit the inside of
the fairing, and my head was crammed into the canopy. Not
good. |
| Rob and I
took the subframe back out of the fairing and discovered that the
front wheel was rubbing on the frame. You can see here
that it looks like it's rubbing already, but it had about
1/3" of clearance. Unfortunately, when weight was applied, it
rubbed bad enough to leave a thick layer of rubber on the frame
tube. We used a donated large crescent wrench to pound a tire
shaped dent in the tube and took it back out to Muleshoe road for
some testing. Much better! Then it was time to spray on some
yellow. On Monday's run I did 57.06 MPH in bad winds and cold
temps. |
1 |
| That was almost as fast
as my previous personal best. Not bad for the first time down the road in a new
bike. My head and knees were still cramped, so Tuesday I modified
the seat to lower it, and worked on the body some. Tuesday night
was a little better, but winds and cold temps kept me down to
58.231 MPH. Wednesday I added some Lycra around the front wheel
hole, and sealed up the rear wheel hole in the rear bulkhead.
During my 58.4 MPH run I noticed some burnt rubber smell, and remembered
that I smelled the same thing the previous day.
Thursday I pulled the subframe out
again. Rubber on the frame showed that I did not beat a big enough
dent in the frame last time. I borrowed an actual ball peen hammer
and made the dent bigger (and more nicely shaped...). |

Picture by Mike Mowett |
Thursday's
run was much better, warm temps and very low winds. Something went
"clunk rattle rattle" in the middle of the run. I kept pedaling... 64.178 MPH!
Friday I found that a bolt on my
front subframe had sheared off due to my over-tightening it. I
spent all morning walking around Battle Mountain looking for the
right hardware to replace it. |
| I replaced the canopy
with my "good" canopy that had no dents, filled more
holes and irregularities in the body and repainted it. All week I
had been running in the first position of the first group, which
has the windiest runs. Friday I was switched with Damjan and his
Eivie speedbike to allow him to run when it was not so dark. I got
another nice run with warm temps and low winds, and cranked it up
to 64.428 MPH. (video
by Mike Mowett here)
Saturday was cold and windy. |

Picture by Jerome |
Most speedbikes need
to be launched by hand, then caught at the end of the run. This
year my bike was no exception, as I had not built a landing gear.
The first picture below shows Al Krause and Larry Lem running out
to catch me. The next picture shows (L to R) Alice Krause, ?,
Andrea Blaseckie, and Larry Lem, busily un-taping the canopy while
holding me up, while I was practicing fogging up the windscreen.
|

Picture by Alex Berthet |

Picture by Alex Berthet |
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Saturday I let
Charlie Ollinger take my cushy last position in the last group
spot to see if he could break the junior record, and ran in the
worst wind of the week. I was too scared to crank it above 60, so
I took it easy and only went 54.6MPH.
Thanks to Thom Ollinger for carting
my bike out to Battle Mountain and back. It's now back in the
barn, awaiting the next modifications. |
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Stuff I need to do for 2006:
- Build new front subframe with no
crank to tire overlap to allow me to race the bike in HPRA
races.
- Make a new Aerokote rear wheel disk, this
time use rubber cement to attach it to the rim. The one I made
for this years races began to pull away from the rim and I
trashed it.
- Build Landing gear
- Build front wheel fairing
- Cut down the rear wheel fairing
a bit.
- Paint spiffy stripe and Cuda-W
on side.
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1/23/06
Maybe something like this?
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3/29/06
I took the front subframe out of the Cuda-W earlier this week, and am taking the components off of it in preparation for building a new subframe with no crank to tire
interference. When spinning the drivetrain it felt very draggy. I'm not sure why, but can only blame the
drivetrain as
everything else feels smooth. Because
of this and the fact that I can't go around corners with the
current drivetrain, the new version of the drivetrain will
utilize a more simplified drive system.
I'll post the updates on the
Cuda-W
drivetrain II page.
5/31/06
The new front subframe and drivetrain has been completed, and I'm
very happy with it. As the front of the bike now sits 1.5" lower, I modified the
rear wheel mounts so they are 1.5" lower too. I had to hack a
couple inches off the rear wheel fairing to allow the bike to sit
on the tires, and then did the obligatory lean test. The bike
still can lean wayyy over. Probably farther than I'll have the
cajones to bank it in an actual race...
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I now need to clean up the
rear wheel fairing, and fill in the large hole in front of the front
wheel caused by the now shorter wheelbase. I laid up some carbon
fiber between layers of plastic wrap on the top of the fairing, to
make a plug for the hole in the bottom. |
6/3/06
Lots of work to do before the Michigan HPRA HPV races next
weekend, if I want to race the Cuda-W. Today I removed the
entire original rear wheel fairing because after removing a
couple inches of height, what was left was too wide and would
have scraped when leaning way over in the corners. |
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Fortunately it came off
virtually intact after attacking it with a putty knife for about 10
minutes.
Hopefully I'll be able to use parts
from the removed wheel fairing to build a new one. |
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I also moved the rear brake to make it
work with the repositioned rear wheel, finished the front
subframe lateral support arm, and glassed in the carbon fiber
bits I made earlier in the week to fill in the holes around the
front wheel.
Shown here is the lateral support
arm. It's a stainless steel tube compliments of Dana Barlow. |
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Because I am planning on
racing in the 50 mile race next weekend, I will need some air in the
fairing to keep me from melting down. I made a mold for a NACA duct
out of 1/8" foam, and applied a couple coats of mold release. This
will be installed in front of the bubble in the canopy. This NACA
duct is smaller than the one in the old Barracuda, I hope it's big
enough to keep me cool. |
6/4/06
I took the Cuda-W for it's maiden voyage with the new front subframe. As it's now a bit lower, I can now climb into the bike un-aided. It's not easy, but I can do it. The drivetrain feels good, nothing hits, and I had it up to 35 or so, but there is a problem with the frame in that it's not stiff enough
torsionally, so if I torque the steering sharply it sets up a
"Death Wobble" oscillation which is extremely scary.
If I slow way down and hold the steering tight it eventually
goes away. Arg.
I added more frame braces but I'm not sure it helped much. |
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6/5/06
Dana Barlow says I need a tube-in-channel stabilizer to prevent the
twisting of the frame. He mentioned something about that last year
but I didn't have this issue with the old drivetrain. I think if I
insert a tube into the steer tube and capture it with a u-channel
attached to the top of the fairing that should do it. I don't think
I have time before Michigan for that.
I'll put it all back together, make
sure everything is very tight and try it on the road again.
Also I made the NACA duct. Still need to install it. |
6/6/06
I put it all back together and went for a 5 mile or so ride. The bike is very smooth and seems to handle the cross winds wonderfully. I had it up to about 35MPH but to go faster I'll need to add the canopy so I don't have the parachute effect...
I can induce a little wobble but it corrects itself quickly. No more "Death Wobble"! It still needs to be stiffer though before I race
it, so I won't take it to the Waterford races.
I installed the NACA duct. It should
work well.
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Unless I position my legs just right, they graze the inside of the fairing.
That makes things difficult when I am trying to *go fast*, which
will be potentially painful during a long race. I'll need to lower my seat a bit to fix it. The air shock works very nicely, I can see it moving up and down when I go over bumps, and while pedaling. It currently has 0 pressure in it, so it looks like I need to add a little
air to reduce the pedaling induced deflection.
6/21/06
I took the Cuda-W to the Waterford event anyway, just for show and
tell, and rode it around the track a couple times. Stability and
handling were fine, though I didn't hit any corners at high
speeds, or try it with the canopy. After returning from the
races I added foam and CF in some of the frame spaces to stiffen
it up. I can still get it to wiggle in a test ride, but a least
it's self correcting. Each time I tweak the bike and take it for
another test ride it feels better. It's probably race-able now,
but it still needs more work before I will feel safe throwing
the bike into a fast corner. I also lowered the seat, and that
appears to have fixed the knee clearance issue, but I need to
move the rear stabilizer arm back further to prevent contact
with my thigh. Nothing's ever easy.
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6/25/06
Did a little more work on the body. Time for more work on the
subframe.
I have decided to not use wheel fairings
for now.
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6/30/06
I've been thinking for a while how to attach the canopy, while
still allowing me to get in and out of the bike. I
originally thought about hinging it from the back, but that
didn't work out. This way seems pretty simple, and it will allow
the canopy to be locked into a partially opened position like
this: |
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Or into a fully opened
position like this. This will keep the cockpit area open enough for
me to get in and out, and allow me to lower, raise and fasten the
canopy from within. Also I'll be able to ride with the canopy
partially opened and still be able to see in conditions where more
ventilation may be needed.
I completed the Canopy mount as in these mockups. |
7/7/06
The front wheel hole is now filled in, and the bottom of the
body is painted for the first time. There seems to be plenty of
room to steer. |
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The Back wheel hole has
been closed in a little too, the mess from removing the wheel
fairing has been cleaned up, and the obligatory yellow paint has
been sprayed. |
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The bike now has a fresh coat of spray
paint. Not perfect, but there is always the possibility of
crashing, especially on the first run. This weekend will be the
first time I will have raced this bike at high speeds in an HPRA
event, and the first race with this front subframe, period.
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7/14/06
The 100 lap race was the first HPRA event for the Cuda-W. I quickly made it up to
40 MPH laps, and was able to catch Rick Gritters, then pass him and hang behind him 1 lap ahead of him.
The bike felt great. At 48 laps Rick tried to re-pass me on the inside
in a corner and we collided, causing us to crash. I slid on my left side, slammed into the wall at the top of the banked curve,
and slid back down the curve on my right side into the infield. I hit a pole with my back tire and the tire/rim were trashed.
I slid 50 meters. That was a lot of sliding... |
7/18/06
Before I crashed, I was cruising
between 38 and 40 MPH on the small track, without working hard.
This bike is fast, and seems to handle crosswinds well, as Rick
said he was getting pushed around by the side winds, and I
didn't notice them. The body is scraped up, and the carbon fiber
Hed3 wheel was damaged badly. I will attempt to fix the wheel by
patching the carbon and unbending the rim, and do more bodywork.
Fortunately none of the scrapes on the body are deep so it
should not be too hard. I'm also doing more work on the
subframe to stiffen it more.
The hinged canopy worked nicely, but still needs a way to lock
them in place. I need a landing gear!!
|
7/31/06
The latest frame upgrade has been completed, and the work on the
body is progressing nicely. I slathered on a layer of epoxy/micro
balloons over the abrasions on the body, then sanded it smooth
with course grit sandpaper. I then sprayed a heavy layer of primer
and sanded again with the medium sandpaper. While doing this I
found a large crack in the bottom of the fairing between the seat
base and the wheel mounts, which was caused by the crash. Arg. I'll need to lay a couple layers
of CF inside the fairing to repair it. Also I was able to repair
the Hed 3 wheel be unbending the aluminum rim, and placing a layer
of CF and epoxy of the cracked CF area of the wheel. It's not
perfectly straight any more, but not too bad... |
8/22/06
Time passes, scratches are filled, paint is applied. Now it's
time to add the graphics. I taped, masked and cut out the
stripes and lettering for the side of the bike in preparation
for the black spray paint.
I still haven't started the landing gear...
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8/30/06
One side of the lettering is done. In retrospect I should have just
purchased the stick on letters. Oh well... Now for the hard part,
making the other side match. I'll need to do a bunch of measuring... |
9/21/06
I raced the Cuda-W on the weekend of 9/16/06 at the Haweye Downs
1/2 mile speedway, in Cedar Rapids Iowa.
Saturday's 50 lap race was tough.
The winds were gusting between 10 and 30 MPH. I was very impressed
with how the Cuda-W handled the side winds. I don't think they
slowed me down at all, and I averaged 38MPH and won the event.
Dennis Grelk raced my old Barracuda, and came in second. Dennis
had purchased the Barracuda in the summer of '06 when I decided
that the Cuda-W was going to actually work for me.
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Picture by Dave Balfour |

Picture by Dave Balfour |
I also came
in first place in class in the 3/4 mile sprint (2nd overall). I did get a
hole shot after a great hand start by Sean Costin, which helped a
bunch, but I think the great time was largely because Dennis Grelk
and Rick Gritters were knocked around by the wind. |
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The 1 Hr faired race on Sunday really cooked me in the
Cuda-W. The wind wasn't as bad on Sunday as on Saturday, so I thought it would be a piece of cake, but my shoe came loose from the pedal when I was launched, and by the time I got up to speed I was over 1/2 lap behind Dennis, Rick, and Rich. Oddly, my speeds didn't seem to be any higher in the lower wind conditions than in the higher winds the previous day. |

Picture by Dave Balfour |

Picture by Dave Balfour |
It took many laps to catch Rick, who was
traveling much faster than the previous day, and then many more to catch Dennis. I passed him and then kept the pedal to the metal. We were going about 40MPH on the back side of the track and
about 36MPH on the front side. As time wore on I couldn't keep up the pace and started slowing down, then with 15 minutes left, Dennis rocketed by me and proceeded to lap me before the finish. Dennis raced my old Barracuda streamliner, and really made it fly. |
11/05/06
I'm finally starting the landing gear.
I had taken some time off the Cuda-W project to build the
e-bent commuter bike, but
now it's time to get moving on it again. Pictured to the right
is a mockup of the landing gear mounting assembly. It has wide
flanges to distribute the forces to a large area of the bike's
shell. The wheel slides completely up inside the box. A spring
loaded door will close over the wheel when it goes up. I'll be
making the individual pieces of the assembly shown here in pink
foam out of multiple layers of carbon fiber (assuming that I
have enough left!), then epoxying them together and reinforcing
with more cf. Once it's all built, I'll glue it into the body,
and do more reinforcing. |
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11/20/06
I laid up a couple of CF panels out of the rest of my heavy Chinese
CF. I sandwiched it between some plastic wrap and then mashed it
between a couple flat, smooth boards. Weights placed on the boards
made sure the layup was well integrated, and smashed out any excess
epoxy. Each panel was 3 layers of CF, which made it a bit under 1/8"
thick. After it cured I traced the mockup template onto the panel
and started cutting with the jigsaw.
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Here's the landing gear in the "up"
position. The wheel fits entirely in the wheel box. The wide
flange will spread the wheel load along a wide area of the
monocoque body. If you look closely you can see the outside tube
of the concentric tubes. The inner tubes slides through this
tube as the gear goes up and down. The outer tube will be
epoxied to the load spreader, and reinforced. |
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Here's the gear in the
"down position. |
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Here's the gear with the second load
spreading flange and the cap to the box.
I suppose I should take this
assembly out to the cold, dark barn now and see how well it fits
inside the fairing. It will be hard to mount this into the bike,
as I'll need to work through the narrow slot in the seat back to
do all the epoxying. |
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12/11/06
I took the assembly out to the cold barn and worried it through the
narrow wheel slot. Looks like it fits in the intended spot, and
doesn't interfere with anything else back there.
I use epoxy and cotton flox to
initially attach the parts together, then added some carbon cloth. I
still need to add some carbon cloth reinforcement to the end caps. I
wrapped the end of the high stress slider tube with some Kevlar
roving to make sure it doesn't go anywhere (yellow string). |
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I filled the bottom of the aluminum
landing gear leg, which I had cut at a 45 degree angle, with a
mixture of chopped carbon fiber, cotton flox, and epoxy. This
provided a sturdy mount for the long nut that the landing gear
wheel screws into. Before epoxying the long nut in place, I
roughed it up and cut some notches into it to give the epoxy
plenty of surface area to grip.
The spring was mounted inside the
leg. The aircraft cable to pull the landing gear down is
attached to the leg with a T-nut to provide clearance for the
spring. |
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3/29/07
I'm working on a new way to allow me to open and close the top
unaided. The method from last June worked OK, but would not stay
open by itself which was a pain. This new method will also allow me
to ride the bike with the canopy open. |
4/8/07
I completed the single rod mechanism as above and tried it on
the bike. It seems too floppy, so I will need to add two more
folding supports more forward on the canopy. This will provide a
solid triangulated mechanism and will hold the canopy open
higher. Higher is good because testing revealed that when the
canopy was folded completely open, I could not get my butt in
through the opening. It's still too cold out to do any
epoxy work in the barn!
4/9/07
I spent some time out in the barn playing with the canopy to try
to figure out how I can attach the canopy to the bike, to let me
to open and close the fairing unaided while still allowing me to
get in and out of the bike without performing feats of tantric
contortionism. I have tried folding the lid forward, but could
not think of a good way to keep the lid open. Hinging it to the
rear did not allow enough clearance for me to get in and out. I
have two options left. I will first try to use fiberglass rods
as springs to hold the top open in folding forward mode. If that
fails I will try to add hinges to have it open to the side
opposite the landing gear. |
4/14/07
I found some nice little bungee cords at the dollar store and
did some experiments to see if they would provide enough force
to hold the canopy open. They do. It was then very easy to
make some hooks to attach the cords to. I am kicking myself now
that I did not think of this earlier.
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Here's the landing gear
mount in it's intended position inside the fairing. I marked the
corners of the wheel box so I could cut the hole in the fairing. On
the next warm day I'll glass it in place. I will need to do some
testing to determine if the body will need reinforcement around the
mounting flanges to prevent it from deforming while under load. You
can see the rear wheel hole in the bottom left corner of the picture. |
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Here's the landing gear sticking
through the hole I cut in the body. I'm happy so far as it
appears that it is in the proper location, and that it extends
far enough to put me at a good lean angle. |
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4/22/07
I CFed the landing gear into the body, and reinforced the
surrounding area. I also removed the front sub frame and epoxied
the remote steering arm into the shaft collar holding it to the
steer tube as it was rotating and causing some play in the
steering. While I had the subframe out I added a layer of soft
foam to the idler wheel that was eating my leg during the
Hawkeye Downs races. I still have to wire the landing gear in
place and test it to see it it's really strong enough and
positioned properly, then build the mechanism to allow me to
raise and lower the gear. |
6/30/07
Time passes and tweaks to the bike happen slowly. I made a
handle to raise/lower the landing gear, and it works adequately.
I tested the system and so far it seems plenty strong. If I have
to rebuild it I will not use aluminum next time though as the
inner tube gets notches in it from where the outer tube digs in.
I ditched the old mirrors made with flat mirrored plastic, as
they were practically useless, and got some small convex mirrors
at the auto supply store.
As I have had very little time
this year to work on the bike or train in it, I took it to the
Michigan races with the thought that I'd try to race it and if I
had problems I'd just race the NoCom. Turns out that's what
happened. The landing gear worked fine to launch the bike, but after 3 laps of the hour race, the bike developed an
uncontrollable wobble of the front wheel at slow speeds and high
power at the top of the hill. I bailed into the grass with no
damage other than my pride. It was disappointing but the bike
ran and cornered well, and was ergonomically good. Besides the
wobble issue, the canopy was not fastened down and the rattle
was incredibly loud, and the Rohloff hub has developed a
mysterious squeak at speed. The next day I discovered a lose
bolt in the remote steering system which allowing excess play in
the system. Arg.
This weekend I had a day to work
on the bike, and I affixed the new mirrors, built a bungee
system to hold the canopy in place, added a rear wheel
fairing, and tweaked things. Next weekend is the Tucker 100!
Just for grins I weighed the bike. It now weighs 60 lbs, which
is 10 lbs more than in 2005 when I raced it in Battle Mountain. |

Picture by Tony Levland/Dave Balfour |
7/17/07
At the Northbrook races I did OK in the sprints, then was doing well
in the 100 lap race by managing to keep Dennis in my old Barracuda
from putting me a lap down after I had a lousy start. I kept this
kept up for 79 laps in the sweltering heat, running between 36 and
39 MPH, then managed to kick my chain keeper while sprinting after
getting stuck in traffic. The kick bent the chain keeper and allowed
the chain to derail. I coasted for 3 laps then bailed out onto the
grass and collapsed. It didn't occur to me that I should have put
the chain back on and finished the race for hours. My brain was
cooked... |
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You can (barely) see the rear wheel
fairing in the photo above. It's attached with duct tape for
now, but I'll 'glass it in place and paint it soon. The Cuda-W
is now basically finished and all the bits are working as
intended. Everything from this point on is "tweaking". |
5/19/2008
Over the winter I worked on a new
drivetrain, but ran into some difficulties, so I just
painted it and put it back together.
The rear wheel fairing is now
glassed into place, and mostly faired in.
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I have one more pass of filler and
sanding to do before I declare it "good enough"
Also I have built the landing gear door.
It needs some filler and sanding too, but at least now the hole is
filled. Here's a video of the
landing gear door in action. |
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More soon... |
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