spinningmagnets
100 TW
ripperton, you seem to be very passionate about this subject. Help me learn...please post your "best compromise" frame configuration and motor placement.
madin88 said:more battery room, where?? or do you mean INSTEAD of a main frame mounted motor?
spinningmagnets said:ripperton, you seem to be very passionate about this subject. Help me learn...please post your "best compromise" frame configuration and motor placement.
macribs said:Ripperton you are hard core man. Just came across this on the tube. 210 kw electric R1. And no chicken strips, you pushed hard man.
RIPPERTON said:Battery box is 500x300x150, could fit 3.5 - 4 kWh in there.
it'd be great to see a vid of that happening, if possible? even if its just in a sandpit or something.Ohbse said:RIPPERTON said:Battery box is 500x300x150, could fit 3.5 - 4 kWh in there.
Nice! Actually could fit substantially more than that with 18650's, easily package 800 cells - 8.6kWh and 50KW of power potential. More than you would need/want on this type of ride for various reasons. Cell weight alone would be 37kg.
On my Giant DH comp running a hub motor the reaction forces that Ripperton is describing under quick acceleration on the stand results in the swing arm SLAMMING into full droop. On the street with a rear heavy weight bias it results in a mild anti-squat motion under serious acceleration - from what jonescg was referring to that's somewhat desirable?
On a purpose built machine capable of higher wheel torque (without flipping over) this may be a much bigger deal than on something that's geometry limited.
Ohbse said:On my Giant DH comp running a hub motor the reaction forces that Ripperton is describing under quick acceleration on the stand results in the swing arm SLAMMING into full droop.
John in CR said:motors affixed to the swingarm will become the norm.
John in CR said:Oh, and BTW your blue bar in the earlier drawing, will cause the motor torque to act on the suspension.
RIPPERTON said:This force has no triangulation so no effect on suspension movement.
John in CR said:The CG of the trike was so low relative to the pivot point that squat forces from accelerating the mass were almost non-existent. In that case, of course there would be "jacking" from the thrust at the wheel acting through the pivot point.
macribs said:What changes if motor is moved to the pivot point? And again if motor is mounted in the swing arm as close as possible to the pivot point.
RIPPERTON said:ok Im going to have to right you off now..
John in CR said:I've tried to bring this topic up a few times related to mid-drives, but it never gained traction. The only time I've seen it brought up by someone in the know was Toolman2, who mentioned a "jacking effect" during acceleration that was noticeably different, but it was easy to become accustomed to it. He mentioned the same positive "digging in" effect as Nutspecial mentioned with his hubmotor(s) earlier in this thread.
I'm really surprised that racers like Ripperton haven't experimented with motor placement in this manner, because all I see are positives. It's probably just a bit too much carryover from gassers, where the motors are too big and heavy to anchor their torque in the swingarm.
veloman said:Is there an off the shelf sprocket that can mounted to the 6 bolt disc rotor holes? Or are the guys building these mid drives customizing motorcycle sprockets to fit on the hub side cover?