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ShelGame
recumbent enthusiast

USA
316 Posts

Posted - 11/06/2017 :  09:21:14  Show Profile  Reply with Quote
quote:
Originally posted by carolina

Yea shelgame, build a low race bike like sb said. This build is incredible, look what you know. Class A+. Maybe two 20Ē wheels racer.
ó

velosRus.com



I have something in mind, but I'm just not into the low racer thing. Yet.
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Speedbiker
human power expert

USA
3835 Posts

Posted - 11/06/2017 :  12:26:52  Show Profile  Reply with Quote
Then a low/highracer!
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ShelGame
recumbent enthusiast

USA
316 Posts

Posted - 11/06/2017 :  13:52:08  Show Profile  Reply with Quote
quote:
Originally posted by Speedbiker

Then a low/highracer!



Getting closer!

I worked on a sketch last night. I'll post it in a new thread later.

But, briefly, I'm looking at a 700/650c 51" WB, RWD stick bike capable of a 10deg seat angle; and with a fixed short boom BB; 23" seat height, 30" BB height.

What I'm not sure of is, the relative strength/stiffness of the main boom that long as a monotube. It might need to be a truss frame in steel.
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Jerry
human power supergeek

USA
1312 Posts

Posted - 11/06/2017 :  17:47:13  Show Profile  Reply with Quote
I have a high racer, mid racer, and low racer. The mid racer is a Catrike Musahi and handles like a very expensive sports racer. The high racer is a hand full sometimes in traffic and high cross winds. The low racer you need to pay attention at all times. If I were to build my own, it would be something like the Musashi. It is very fast and nimble. The seat recline is not 10 degrees, but that can be worked out. Good luck with whatever you choose.
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Speedbiker
human power expert

USA
3835 Posts

Posted - 11/06/2017 :  18:55:25  Show Profile  Reply with Quote
Sounds good. I assume the frame will have a slight Z?
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ShelGame
recumbent enthusiast

USA
316 Posts

Posted - 11/06/2017 :  21:43:17  Show Profile  Reply with Quote
No Z. This is just a first sketch. Literally did this last night in a hour before bed. Really just a geometry study at this point. Feel free to poke holes in the idea.

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Speedbiker
human power expert

USA
3835 Posts

Posted - 11/07/2017 :  00:30:52  Show Profile  Reply with Quote
How about moving the front wheel back and Zing the frame a little?
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alevand
human power expert

USA
3260 Posts

Posted - 11/07/2017 :  05:29:49  Show Profile  Visit alevand's Homepage  Reply with Quote
Looks like a Bacchetta.I made a bike once with the BB that high, seat was much lower, 15 inches, I would fall over at stops, trying to get my leg up that high to start, with an up hill grade. With the seat that high, you can walk it first to get rolling, then bring your legs up, so your tiller should have a pivot, so you can sit up. The forward bars makes that easier, to pull up on. Of course if its just for racing, its fine.


C:
Tony Levand

Edited by - alevand on 11/07/2017 05:41:11
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ShelGame
recumbent enthusiast

USA
316 Posts

Posted - 11/07/2017 :  09:55:24  Show Profile  Reply with Quote
quote:
Originally posted by Speedbiker

How about moving the front wheel back and Zing the frame a little?



Like this?



Thought about it. Right now, I have a fascination with 'stick' bikes. So, I was seeing where it could go; how low you can get the seat, and what it would look like.

I actually have a Rans F5 steel frame coming today. I'll probably play with that first for a while and see how I like it. Then decide what to build next...

Edited by - ShelGame on 11/07/2017 09:56:15
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ShelGame
recumbent enthusiast

USA
316 Posts

Posted - 05/24/2018 :  13:47:06  Show Profile  Reply with Quote
I'm going to try something with this bike this weekend. Dual 559's. I have a fork I got for the ActioBent and never used, 2 559 disk wheels from a parted out MTB, and a pair of skinny 559 tires (actually, wheelchair tires) also from the ActionBent.

This should raise the BB 2-3", and lower the top of the seat about the same. Maybe lift the seat bottom an inch or so. It will get the seat angle down to ~20deg even, but also slacken the HTA to ~ 63 degrees.

I'll sketch it all up before I fit parts, just to make sure the steering geometry isn't something stupid. But, it should make this bike much more aero. And, I already have rear wheels covers to fit the 559.

Edited by - ShelGame on 05/24/2018 13:47:35
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ShelGame
recumbent enthusiast

USA
316 Posts

Posted - 05/26/2018 :  16:30:17  Show Profile  Reply with Quote
Assembly potion of this experiment is done.

New specs are:
71" wheelbase
30.25" BB
20.5" Seat
17.5deg seat back
62.5deg HTA
4+" (!!!) of trail



Now, to try and ride it. I'm a little worried about wheel flop with remote steering. We'll see. Maybe I'll have time for a ride around the block tonight after dinner.

Edited by - ShelGame on 05/26/2018 17:13:40
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ShelGame
recumbent enthusiast

USA
316 Posts

Posted - 05/29/2018 :  11:00:47  Show Profile  Reply with Quote
It's rideable. Wheel flop is there; but, manageable, I think. This bike is way more comfortable on bumpy roads than the F5. Feels faster, too. But, that might just be because it's lower to the ground.

It'll need better tires, and I think I need to re-do the handlebars to clean it up. I can't see a damn thing through them with this setup.

Need to move the wheel covers from the Stratus over to this bike.

Edited by - ShelGame on 05/29/2018 11:08:49
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warren
human power expert

USA
6294 Posts

Posted - 05/30/2018 :  17:45:33  Show Profile  Visit warren's Homepage  Reply with Quote
Wow, that's pretty laid back now! It should be fast once you get the HBs worked out.
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Jerry
human power supergeek

USA
1312 Posts

Posted - 05/30/2018 :  20:28:36  Show Profile  Reply with Quote
Looks good and fast! Nice work.
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ShelGame
recumbent enthusiast

USA
316 Posts

Posted - 06/18/2018 :  08:49:50  Show Profile  Reply with Quote
New and improved (lowered) handlebars coming up! Took maybe 2" off the top; really cleaned up the cable routing. And, these shifters let me move the grips about an inch closer together.




Edited by - ShelGame on 06/18/2018 08:51:06
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ShelGame
recumbent enthusiast

USA
316 Posts

Posted - 07/13/2018 :  21:11:30  Show Profile  Reply with Quote
Visibility is greatly improved with these. Should be much lighter, too. Hopefully get a test ride around the neighborhood tomorrow.

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ShelGame
recumbent enthusiast

USA
316 Posts

Posted - 07/15/2018 :  12:11:56  Show Profile  Reply with Quote
Just gave it a quick test ride around the block, and I think I like it - a lot. The steering Is a bit heavier, but itís also much more on track (probably due to the very long trail. When it turns, it wants to Ďdive iní to the turn. At slow speeds, thatís not such a good feeling. But, at higher speeds I think it will be fine.

I think this is now my primary bike for Northbrook. Iíll bring the F5, too. Just in case.
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