Hi,
Ypedal wrote:yep... and these numbers will be even higher with 12 cell lipo.. so a 50 % reduction sounds about right.. just not sure how the hell i'm going to get it out of this setup !! ( clearance issues.. )
oh joy..
Why don't you use two chains to the Nuvinci, to go directly to a FW on the Nuvinci, bypassing the crank, like Gary did here with the Nexus 3:
http://www.endless-sphere.com/forums/viewtopic.php?f=28&t=12267The drive part of this is really pretty simple. There's separate chains to the rear for the motor and for the pedals. Both rear sprockets are attached to the SRF-3 hub, via a standard Nexus 16T splined steel cog (also available at UtahTrikes.com...). I'm using a Nexus cog because they are dished slightly, which helps in the alignment of the chains. This steel cog is sandwiched between a 22T 4-hole 64mm BCD "granny gear" aluminum mountain bike sprocket, and a 94T aluminum #35 heavy duty go kart sprocket I got from gokartgalaxy.com. This sprocket already comes with a 2-1/8" hole and four holes in a compatible 64mm BCD pattern. The 16T cog lines up perfectly, so it literally just bolts together. I used some small 3/8" wide spacers I got from McMaster, to space the two sprockets apart a bit. This assembly then slides onto the splined hub and is held in place with the circlip. The big #35 sprocket is on the inside. The 22T sprocket ends up being perfectly aligned with the chainline coming from the crankset.
To keep the motor from driving the pedals, I replaced the front crank with an IPS crankset, which has an embedded freewheel. I'm having some adapters made, however, that will eliminate the need for having to add a FW to the crank. The adapter will replace the 22T sprocket with threads that will allow a standard BMX freewheel to be screwed onto the adapter. These come in sizes from 16T to 22T, so it will be easier to match a stock setup.
I think you can use a FW for the pedal chain, and a fixed sprocket for your Motor using the FW on Matt's reduction drive(if there is room for both a FW and fixed sprocket on the Nuvinci). That would replicate the effect of Gary's adaptor meaning the Motor won't back-drive the chain to the BB. I'd try to limit the reduction to about 3:1 between Matt's drive and the Nuvinci.
swbluto wrote:Gee, what post did you see this at? Those wires look tiny compared to the motor, but I guess that's how things go when the motors go huge. It just seems unlikely that it'd carry 15 kW, but maybe it's a "High voltage" type of motor?
Using the sensors (optional) it doesn't have the normal
RC Motor voltage limitations imposed by the necessity of using
RC esc's. Luke thinks with the water cooling (optional) it will handle twice that. Here's the thread. The description of the version of the motor with Hal's tweaks begins roughly on page 8:
http://www.endless-sphere.com/forums/viewtopic.php?f=2&t=16728
"
... i hate it when the simplest things kick my ass sometimes... i've been sitting with a battery pack in my hands for the last hour pondering how to make a mount inside the triangle to hold that sucker.