New BUB's build 2013

[Marty]

Trying my hand at a new bike build, tell me what you think Thanks.

[Stan Back]

Be good to have a motor.

[Marty]

Thought I would try the flinstone way!!! LOL. there is still alot of brackets and supports to go. Got a motor, just in re build stage.

[tauruck]

Yabadabbadoo!. It looks good so far and the rear hub is very cool. What's it off?. Good luck with the build.

[donpearsall]

That's one looonnnnggg bike. Good luck with it. Spokes?? Those went out before the Flintstones!
Tell us some details. What class are you building it for?
See you there.

Don

[Marty]

Rear hub is an rd 350 yamaha. drum brake figured weight wasnt the issue here but drag is. 94 inch wheel base, thought it would be nice and stable, still got to hang fuel cells and more gussets plus battery box and nitrous stuff. front hub and wheel will match but no brake. Class is still to be determined, keep you posted. thanks

[Interested Observer]

The frame front end looks awfully flexible.  Hardly any torsional stiffness.

[55chevr]

The engine will add some rigidity as part of the stressed frame.

Joe 

[DND]

Hi Marty

Looking good so far, what type of engine are you going to run and how many holes 1 - 2 - 3 - 4

Don

[tauruck]

That's one looonnnnggg bike. Good luck with it. Spokes?? Those went out before the Flintstones!
Tell us some details. What class are you building it for?
See you there.

Don

Don, you don't like spokes?. Spokes rule, me, I love spokes.

[Peter Jack]

I've ridden down two rear blowouts from speed because a foreign object ended up in the tire and ripped the tube. I refuse to ride anything with spoked wheels and tube tires. There's nothing sets your heart to racing like when the rear end of the bike decides it's going to get past you at 70 to 75 mph and you're all crossed up like a speedway bike trying to stay upright and get stopped. I'm a real fan of tubeless tires and one piece wheels. 

Pete

[tauruck]

Only two kinds of riders, those that have fallen off and those that are still going to.

[Koncretekid]

Good start with the frame, but a few questions and observations:
-what is the frame material?
-try to keep truss members intersecting at their ends; think of triangles connected to triangles.
-the single top tube is too long to be considered a "short column" so will flex and could bend.  I prefer double top tube or a larger diameter, like the Egli design.  We can encounter fatigue cracking, even in tubes in compression.
-add diagonal bracing (motor will help if connected at it's corners) and lots of crossmembers.
-add gussets at the headstock; you don't want any flexing at that point.
-larger front and rear axles and larger fork tubes like new sportbikes will increase torsional stiffness as well.
-spoke wheels are hard to true up and can encounter other problems as Peter has posted.
Good luck with the build.  I live in Lafayette, CO spring and fall. Feel free to ask questions.
Tom
     

[bak189]

WHY....so long??  Are you planning to attach a sidecar?

[Marty]

Thanks for all your input folks. I just wanted a low and long ride, no more to that. As for spoke wheels, I want every piece of this bike to be made and put together from my hands, I laced and trued the wheels myself, not many people can do that anymore, its a great look, front is matching, NO sidecar, not into 3 wheelers. as for tubing all D.O.M 1 1/4  .095 wall except center loop, which is 1 1/2. Trust me it will be plenty strong when all gussets welded. Not sure on motor yet but sneaking up on an idea of a twin cylinder something. (NITROUS OF COURSE)
The frame is in a very infant state, thanks