Yes, for your application, you will need a chain drive as a belt would not take the torque in that situation. I can set you up with a 6 to 1 .25 pitch chain drive. I would need your motor in hand to do the machining needed to mate it with the mount plate.
Also, what is the output shaft diameter (maybe 6mm)?
Oh, the guys on RC Groups are looking for you. The keep mentioning it "Where is GGoodrum?"
I think myself and Askman are about the only ones who know what is going on.
Yes, I definitely think the chain drive would be better. I remember trying to add a belt drive "extra" stage to a big Ion helicotper, so that we could use a Neu 1521 motor, but even with the Kevlar-reinforced belts, they would shread with the power we wer trying to put through them (5kW+, or so...). We originally tried gears, but even doubling them up, the nylon gears would melt.
With the Kevlar HTD 9mm belts, I think we could get 2-3 flights before they came apart.
I barely have enough time to spend over in this world, so I haven't been on RCGroups in awhile. When I get to the point that I can give up my aerospace consulting work, maybe I'll have time to do both, but not now, unfortunately. Maybe you and Andrey can let those who are interested know this. I've also talked with Fred Bronk a bit.
The output shaft of the P62 gearbox is actually 14mm. It is a real beast.
I think the output shaft diameter of the motor, going into the GB is 8mm. What about using the PowerJazz, worth a try? If you PM me your address, I'll send you the 2215/P62, for whatever 'fit" checks you need to do.
I'm still trying to decide which bike I'm going to install this on. I have a 16" Dahon Curve D3, which has a 3-speed S-A hub (similar to the Nexus 3...), but I'm thinking I will try putting one of the new BMC geared hubmotors on this. I also have a 20" folding bike that currently has a Cyclone 1000W setup. Other than being a bit noisy, this performs quite well, even on 48V (16s4p a123s...), so I'm probably going to leave this alone. With the power this Neu-based setup will be capable of, I'm now thinking the best choice might be to replace the front-mounted 5304 on my wife's Townie. This would solve several problems. this Townie came with a Nexus-8 hub in back, which also has an internal hub brake. The front wheel also has a hub brake, and the fork doesn't have mounts for standard V-brakes, or for disc brakes. I had the 5304 mounted on the front, and used some coiled wire/retifier-based "ebraking" as the front brakes. This worked okay, but the pushbuttons I was using kept failing. I was also woried about putting this much power (72V/50-60A...) through the stock aluminum forks. I then decided to replace the front fork with a heavy-duty steel mountain bike fork, but it took awhile for my local bike shop to find one that would fit the Townie headset. They finally did, but now there is an issue with getting a V-brake setup that would fit properly with the big Fat Frank tires that came on this bike. There is a clearance problem, something to do with where the V-brake mount is on this fork. I don't know, but at this point, I think what I want to do is put this back stock, with the standard fork and hub brake setup, and install this Neu-based setup, with your new widget, in a fashion like wht Mitch and I have been discussing, which is basically in series with the pedal drive. There is definitely lots more room to work with, on the Townie, and even on a 48V/16s a123-based setup, I think this will have tons of power. Having the 8-speeds on the Nexus will provide even more options, I think, although I doubt that any more than 2-3 gears would ever be used/needed. With 8-speeds you could have stump-pulling low-end torque and still have a 50 mph top end, all on a 48V setup. To me, this is really getting closer to my own personal "holy grail". I love the 72V/80-90A performance you can get from an x5-based setup, but I really want to standardize all my setups on 16s/48V, and make use of these wonderful planetary hubs to get both good low-end performance without sacrificing a "decent" top speed capability.
Mitch, I will have to think about the whole freewheel/oneway issue. I'm having a hard time picturing what you are describing, as I'm not completely up on what is readily available. I know that the rear-type freewheels seem to have big diameters, so some sort of adapter would be needed to make it work for a "jackshaft". but I know that SDP-SI has lots of one-way options that might work just as well. Marrying these up with sprockets is where I get lost.
I get that we need a one-way/freewheel for the one that is driven by the pedal. This would eliminate having to have one in the crankset, like the Cyclone setup uses. I also see that it would need to be locked to the second sproket that drives the rear hub. I think then all we need is one more freewheel/oneway, somewhere in the reduction box that Matt is doing, right? Is that what you meant by the jackshaft input? I guess another way to look at it is that you have a direct sprocket (i.e. -- no freewheel/oneway...) that drives the chain to the rear hub (which has a freewheel already...), and then there are freewheel/oneways for both the motor sprocket and for the pedal sprocket. How this all comes together is what I don't yet understand.