I agree, I tried to go AW's route, for the same reasons I assume (no $, and to reduce mining of new stuff), and gave up. I used a free bike, and scrap plywood, my favourite material: Couldawouldashoulda finished that one, but the devil's in the details, and I gave up fighting him.Drunkskunk wrote:Solving engineering problems with existing materials takes more skill than starting with a blank slate.
Pretty much.1JohnFoster wrote:I agree, I tried to go AW's route, for the same reasons I assume (no $, and to reduce mining of new stuff), and gave up.Drunkskunk wrote:Solving engineering problems with existing materials takes more skill than starting with a blank slate.
amberwolf wrote:Interesting; I kinda like it. I guess there's not a lot of stress on the fork, making the lefty single-stanchion design possible for lighter weight?
The rider is as low as possible within the constraints of a normal riding position. We've taken pains to keep the passengers' weight as low as possible for safety and handling. It's not necessarily a bad thing, you know.One thing that I wonder about from a passenger perspective: would it be possible to lower the whole rider section of the frame a few inches to put their back end a little lower? It's not at passenger face level, but is it possible it might bother some of them? (or am I just too picky?)
Is the new seat module going to be carbon fiber rather than fiberglass for extra weight savings, or is it already light enough to not be worth the extra expense/etc?
http://sdheadliner.com/neighborhoods/di ... eight-men/Chalo wrote: It's not necessarily a bad thing, you know.
No, really, WHAT IS THAT?diff_lock wrote:What it is: Modified Chinese electric scooter.
What do you want to know?Dauntless wrote:No, really, WHAT IS THAT?diff_lock wrote:What it is: Modified Chinese electric scooter.
Oh yeah, thanks, that covered it for me. Just curious what exactly you'd started out with.diff_lock wrote:What do you want to know?
https://endless-sphere.com/forums/viewt ... 2#p1078547
It's because disc and drum brakes are designed to mount on the left.1JohnFoster wrote:What I'd like to know is, why are single sided forks always left? Given that most people are right, and the well known added load of supporting dual crowns.
Is it the sideloading in turns, since it doesn't lean to keep forces in line with the wheel vertically? Or the braking forces due to mass? Or something else?Chalo wrote:A pedicab's fork is under a lot more stress than any bike's.
What makes you think the single side arrangement would be inherently weaker?
Correct on both counts. These vehicles see 1000 pound gross weights fairly routinely, so fundamental problems become practical problems very quickly.amberwolf wrote:Is it the sideloading in turns, since it doesn't lean to keep forces in line with the wheel vertically? Or the braking forces due to mass? Or something else?Chalo wrote:A pedicab's fork is under a lot more stress than any bike's.
True, passenger weight is placed over the rear axle as much as possible. But that leaves most of the driver's weight on the front wheel. It must be built to take that load, plus any dynamic loads that result from not being able to lift the front wheel over obstacles.I suppose the stress I meant was the vertical weight, since I presume most of the weight would be over the rear axle(s), especially when loaded with passenger(s).
A thicker axle is a must; that's the main thing. Cannondale's Lefty fork axle is substantially hollowed out for light weight, but measures 20mm at the inboard bearing and 12mm at the outboard bearing. That is demonstrated to be at least equal to a conventional front axle, and probably stronger. Ours is 22mm at both bearings and 1" at the hub, very thick-walled.But I supposed that lever forces against the axle and the steerer and the crowns and legs would be significant, vs a dual-leg fork that wouldn't have that type of loading, exactly, so that given the same materials, thicknesses, hardnesses, axle sizes, spokes, rims, etc., a single-leg fork would not be as strong as the dual-leg. However, I guess that's why you're using a stiffer wheel build, thicker axle, etc?