rodgah wrote:what is it???
do you have any footage of the bike in action?
sadly no, it'd be dull as batshit anyway... I might pull one of the controllers off my mountainboard (which seem to work really well, FAR better than the SS190-200's) to see how it goes. Might gear it down a tad more to make sure I dont kill the controller (cant really afford anything new at the moment!!)
Whiplash wrote:That's one of John's motors isn't it?! Badass! Look forward to the build!
yupers! im now tossing up whether to mount it to the d8 or do a custom frame. One of the guys in the uni workshop who's a really brilliant welder (and general machinist) is keen as to help which makes it a real posibility over the next year or so...
As a result I've started playing around and teaching myself inventor at uni. Here's some initial concepts, using Johns 93% motor as a mid mount. Its only basic ideas, i'm still figuring out how to use even the basic parts of inventor, much less all the simulations etc it can do! sick program though. This is more of a 'initial thoughts' and getting some practice with inventor...
heaps of space - thats 24s 15ah of hardcase packs in there along with a lyen 18fet and johns motor, of course. There's enough room that I could probably squeeze in 32s 15ah, for some serious power and range!! the main body of the frame is 150mm wide and 200mm tall. so not exactly small...
the motor axles also act as the pivot points for the rear swing arm, making the chain path (and its tension) really easy to build and maintain.
the seat mount you can see is a very basic concept - the idea being to have it being quickly adjustable from normal riding to tucked away for trials type riding with the use of a 2nd strutt (not pictured) and a quick release mechanism to allow for seat height adjustment on the fly.
ignore the rear wheel hitting the swingarm, was messing aroudn trying to get the wheelbase to around 1200mm, currently its at 1250.
Really hoping that I can make it less like a fat ugly pig, though that might be hard if I want to still use atleast 24s 10ah with johns motor inside the frame.
Here's some of my initial plays with inventor, building 2stage reductions for 6374 and 8085 motors, using 219 chain and a freewheel bearing (copper in color) on the input to the 2nd stage to enable use of a 12t sprocket on the 2nd stage output to a 72t on the BB. This means far more reduction (6:1) rather than the usual 16+t freewheel to ~40t chainring, for a total of about 36:1 reduction in a fairly copact bit of kit. It does have some clearence issues with the motor and the frame/2nd stage axle which might cause issues with eddy currents during use.
and the twin 6374's, same idea with the 2 stage reduction, but pairing the two motors together via a separate chain. turns out that its huge - 230mm long!
the motors also have some centrifugal fans ill get printed on the uni's 3d printer attached.
! means I have to order a bunch to make it worth while. Kind of annoying given china and the UK have such small shipping costs for small stuff like this but its the US that has heaps of these kind of parts available. 
. Looks like they're actually the online distributor for minibearing.com.au... hence the similarity between the sites. 
. either that or I'll just use the 2 80100's I've got sitting on my desk as a DD rather than bothering with gears... I do however like the size of the smaller motors, you can fit 2 in almost the same space as a 80 series, and in tighter spaces given their shorter length. but yea, they may end up being too small. time will tell... 
