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 i want to build a low racer short.
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carolina
recumbent guru

USA
516 Posts

Posted - 07/05/2016 :  19:34:06  Show Profile  Visit carolina's Homepage  Reply with Quote
I have got to build a lowracer. My favorite is john tetz . Dad is 90 and gets around great but l gotta get him riding. He plays golf 2 or three days a week.

I will make of carbon fiber. I make and sell square cf tubes on ebay. I will have a new style boom, @ rear will be 26" & 20" up front.

l like john's more uprite and shorter angles:

[/URL]

Will look like this from seat backwards but with no frame. It will be hardtail unibody with no frame. l will use cf 12K twill, innegra, nomex honeycomb. l will use my velomobile mold to make rear, this unibody 2 wheeler will weigh less being all carbon. Enclosed chain canal under seat all the way back to rear derailleur. Enclosed wheels front and rear. Sturmey Archer drum hubs front & rear.

[/URL]

Will have chain canal, runs whole length out to rear bulkhead. Help keep stuff clean.

Carbon fiber square tubes up front will be glued with hysol aircraft adhesive: Also will need uv clear cote over carbon. Or a color. l have seat mold and iam making a new seat (plug) with lil' more height for neck & head.

[/URL]

Maybe a pinion: below 18 speed, maybe to heavy up there.

[/URL]

_______________________
velosRus.com


velosRus.com

Edited by - carolina on 02/07/2017 17:11:21

warren
human power expert

USA
6050 Posts

Posted - 07/05/2016 :  19:40:37  Show Profile  Visit warren's Homepage  Reply with Quote
That is a great design, it is certainly easier to build with the square tubing.
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Speedbiker
human power expert

USA
3702 Posts

Posted - 07/05/2016 :  19:58:49  Show Profile  Reply with Quote
Hysol, a favorite of hpv builders.

Edited by - Speedbiker on 07/06/2016 15:46:37
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warren
human power expert

USA
6050 Posts

Posted - 07/06/2016 :  05:46:21  Show Profile  Visit warren's Homepage  Reply with Quote
If you want to keep the bike short, you should stay with the small wheels. If you add a 26" wheel to the rear it will be getting long.
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warren
human power expert

USA
6050 Posts

Posted - 07/06/2016 :  08:03:54  Show Profile  Visit warren's Homepage  Reply with Quote
Check out this page for some info on the single sided fork I built for my dual 20" lowracer a really long time ago:
http://www.recumbents.com/wisil/barracuda/barracudaframe.htm
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alevand
human power expert

USA
2874 Posts

Posted - 07/06/2016 :  14:17:01  Show Profile  Visit alevand's Homepage  Reply with Quote
Your dad being 90 could fall and break a hip?

C:
Tony Levand
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warren
human power expert

USA
6050 Posts

Posted - 07/06/2016 :  18:47:51  Show Profile  Visit warren's Homepage  Reply with Quote
If I were you I would just build a non suspended front and if you want a cushy ride, build a rear suspension. In general, front suspension is for handling, rear suspension is for comfort.

Also that sliding BB looks heavy. I recommend building a tube that slides onto your existing tube and mounting the BB shell with some glue.

Edited by - warren on 07/06/2016 18:51:19
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carolina
recumbent guru

USA
516 Posts

Posted - 07/06/2016 :  20:09:08  Show Profile  Visit carolina's Homepage  Reply with Quote
Read about your headset, crank and headset is in one tube on tetz. I have another cf boom with holes l would like to buy from df. Just mill & insert bb where one wants it. The aluminum bb one is not heavy either if one wants that for a tetz bike. The first one l build will be hardtail w/ waw drop outs. This is a back burner project, velo shell is first. This will be neighborhood ride only. This will not be a laid back to much bike, staying on par with johns angles and degrees. Thanks.

Heres the cf tubes again: Sold on ebay under (toys and hobbiest).

[/URL]

One might not think about it, but making the two part air-bladder mold was most rewarding.

velosRus.com

Edited by - carolina on 09/24/2016 11:04:46
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carolina
recumbent guru

USA
516 Posts

Posted - 07/07/2016 :  08:48:33  Show Profile  Visit carolina's Homepage  Reply with Quote
Rear wheelwell tool turned out strong & shiny this morning. 2 piece tool will make a nice carbon part for velo or 2 wheeler.

[/URL]

http://www.youtube.com/watch?v=4e9GU-FQU2Y

Took two hours to clean it.
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velosRus.com



velosRus.com

Edited by - carolina on 08/19/2016 15:45:20
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Speedbiker
human power expert

USA
3702 Posts

Posted - 07/07/2016 :  08:50:26  Show Profile  Reply with Quote
Am I the only one disappointed Carolina isn't building a racer?
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carolina
recumbent guru

USA
516 Posts

Posted - 07/07/2016 :  10:34:02  Show Profile  Visit carolina's Homepage  Reply with Quote
Gonna stick with the tetz special or close, an try to get one finished. Putt around in the neighborhood here. Gotta save some money for the leitra front fender.

That vertical tube in front of seat is 18" & boom is 2 feet. Will use these 2 tubes to make the 3. The long tube will be cut to make 3rd short piece under seat.

Here are those tubes, my gussets are cf & soric honeycomb sandwich'ed. Aircraft adhesive will fix positions. I have a harborfreight miter box.

Get the full scale print out at williams office down the street of just the front.


velosRus.com

Edited by - carolina on 09/12/2016 11:12:33
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carolina
recumbent guru

USA
516 Posts

Posted - 07/07/2016 :  14:21:09  Show Profile  Visit carolina's Homepage  Reply with Quote
The right tube (DF boom) in pic above is 26"/weight is 8th of a lb.. The left tube l made is 34" and is 1 pound. I make them, sell them on ebay ,,, and they will make a nice tetz/LR. Collecting few parts for frt steer/mono fork.

velosRus.com

Edited by - carolina on 07/07/2016 15:20:46
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warren
human power expert

USA
6050 Posts

Posted - 07/08/2016 :  19:53:41  Show Profile  Visit warren's Homepage  Reply with Quote
I used a Paul hub, M5 has them too.
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Balor
recumbent guru

Russia
512 Posts

Posted - 07/09/2016 :  01:22:02  Show Profile  Reply with Quote
Build your own carbon XPS-core wheel, with like 20mm ID bearings and 20mm axle?
Hookless, but with beadlocks.
http://www.light-bicycle.com/hook-less-control-carbon-29er-rims-is-ready.html

Bead locks can be post-formed by silicone caulk, I've posted a DIY tutorial from MTBR somewhere.
I'll certainly try it someday, but I lack machining tools to make tight tolerance bearing seat. Might ask a machinist to make a simple tube with bearing seats and glue it in.

Edited by - Balor on 07/09/2016 01:23:11
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warren
human power expert

USA
6050 Posts

Posted - 07/09/2016 :  04:47:43  Show Profile  Visit warren's Homepage  Reply with Quote
Yes, Narrowed, single sided hubs are not cheap.

You could look for wheel chair hubs. Sometimes you can find those cheap.

Or you can use a 14mm BMX hub, and replace the axle and nuts with a hardened 14mm bolt.
https://www.danscomp.com/products/427022/Profile_Mini_SS_Front_Hub.html

Or you could call some trike manufactures to try to get a hub from them.

Or you could take a regular hub, narrow it, and replace the bearings with 14mm ID cartridge bearings.

Edited by - warren on 07/09/2016 04:55:02
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carolina
recumbent guru

USA
516 Posts

Posted - 07/09/2016 :  06:37:49  Show Profile  Visit carolina's Homepage  Reply with Quote
Ok great! Thank Warren,, you help alot.


[update monday] My new idea for frt hub axle, well l can't tell ya now, l'd haf ta kill ya:)

l can not take the credit, just from a person that cares.

velosRus.com

Edited by - carolina on 07/11/2016 11:11:54
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carolina
recumbent guru

USA
516 Posts

Posted - 07/11/2016 :  11:03:00  Show Profile  Visit carolina's Homepage  Reply with Quote
Full size/scale hysol "adhesive station" now: for the square carbon fiber tubes with hysol aircraft adhesive.

[/URL]

I have a carbon scab plate that runs up left & right side of boom tubes 462 that will help join all three cf tubes & there will also be gusset down by seat for tube running under seat parallel to chain canal and another gusset @ tube (boom) 619 intersection.

I make square cf tubes and sell on ebay (toys and hobbiest). I also make cf ,soric honeycomb plates, innegra (can be added too) sandwich'ed between granite (free sink cutouts from glass & marble store dwn the street) til cured.
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velosRus.com

Edited by - carolina on 09/24/2016 10:58:21
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Johnsfwdbent
recumbent enthusiast

USA
112 Posts

Posted - 07/11/2016 :  11:37:00  Show Profile  Reply with Quote
what size cf square tubing and what is the wall thickness that you are going to use?
also what does it weigh per foot.

Thanks,
John
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carolina
recumbent guru

USA
516 Posts

Posted - 07/11/2016 :  13:14:18  Show Profile  Visit carolina's Homepage  Reply with Quote
40mmx40mm square cf.

I am 208 dressed, jumping on (ebay) the cf tube. This 619 tube is 8th of a pound. The 462 (18") tube is bout 6th of lb..

[/URL]

I can make em thick as ya want. You will haf to read whole post but it has changed constantly. I erased obsolete post from thread to keep it slim and readable.

Iam copying the idea l like most "john tetz special",, l call it. Lil' different but same attitude.

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velosRus.com

Edited by - carolina on 09/24/2016 11:12:27
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warren
human power expert

USA
6050 Posts

Posted - 07/12/2016 :  12:25:07  Show Profile  Visit warren's Homepage  Reply with Quote
It looks to me like there fenders stick out 6" or so behind the wheel, that may cause some clearance issues. Also, are they symmetric?
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alevand
human power expert

USA
2874 Posts

Posted - 07/13/2016 :  03:23:38  Show Profile  Visit alevand's Homepage  Reply with Quote
Thats a nice looking fender, how stiff is it when pushed sideways at the tip? Are they heavy? Where did you buy them, how much? Is there a rear one also?

C:
Tony Levand

Edited by - alevand on 07/13/2016 03:24:21
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alevand
human power expert

USA
2874 Posts

Posted - 07/13/2016 :  09:40:34  Show Profile  Visit alevand's Homepage  Reply with Quote
Yes thats too much for fiberglass.

C:
Tony Levand
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carolina
recumbent guru

USA
516 Posts

Posted - 07/13/2016 :  10:53:32  Show Profile  Visit carolina's Homepage  Reply with Quote
This is front fender l ordered (http://www.leitra.dk/news.php),,,, he (c.g.) will make it round at rear. These aint cheap either but l haf to have one. This fits to schwabe 20" with my narrowed sturmey archer frt brake drum. And it will clear chain like tetz special.

Iam lil' lazy (mike ain't making a plug and a mold for a frt fender right now, l can tell ya that) but this is a start. My first one is monoblade/ fork up front, no shock!

[/URL]

The one l recieved:
[/URL]
__________________

velosRus.com

Edited by - carolina on 08/18/2016 11:31:32
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carolina
recumbent guru

USA
516 Posts

Posted - 07/17/2016 :  18:24:57  Show Profile  Visit carolina's Homepage  Reply with Quote
starting a new project of spraying duratec and polishing duratec surface primer (easy sanding). Later will spray duratec clear if needed, it can be buffed to a hi-gloss 80%. Great for plugs, great to salvage a mold also. 1.8 spray tip works for me.

Buy here:
compositeenvisions.com

http://compositeenvisions.com


Duratec: Good read

http://duratec1.com/duratec/?page_id=806
____________________

velosRus.com

Edited by - carolina on 09/24/2016 11:17:45
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Speedbiker
human power expert

USA
3702 Posts

Posted - 07/17/2016 :  19:57:10  Show Profile  Reply with Quote
Mold or plug, Duratec is your best friend.
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carolina
recumbent guru

USA
516 Posts

Posted - 07/23/2016 :  07:10:05  Show Profile  Visit carolina's Homepage  Reply with Quote
rear wheel well mold for my 2 & 3 wheeler. Making of mold/1st video.

http://youtu.be/mF3oHfkN5uo

[edit] 23-Saturday/July 2016: oooooh, aching, that layup took 2&1/2 hours non-stop. Finished @4:00pm.
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l did this un-orthodox: l made lil' black female rear wheel well (vid above) down in big velomobile mold for a custom fit. Sanding it outside for weeks part time/Then did this male layup (vid), which will be a plug with duratec sprayed on it and buffed to the highest gloss/80% published. Then make a 2 piece rear wheel box mold from the duratec plug.
____________________

velosRus.com

Edited by - carolina on 09/24/2016 11:22:05
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