Miles wrote:More like 10% to 25%, I think...wojtek wrote:So efficiency as such does not bother me as much - if i lose 5% of efficiency.....
wojtek wrote:Isn't it like saying that without the "gearbox" like NuVinci, you have something like a car that can only have 1 gear? so what that it may be more "efficient" if you have no flexibility? you either have eg 1st gear which is great for start and going very steep hills but nothing else... or 6th gear to go really fast but you cannot start.
the reason i went for NuVinci was that i have a lot of hills to climb. Using HV 160 sensorLESS controller, i noticed that the drive without pedalling help [i am pedalling to charge my battery directly not as an additional drive] struggled to go uphill from standstill.
Also the high torque / top speed is limited when using just one 60T sprocket.
I am hoping that Astro will have more chance to use its potential with help of NuVinci.
Sorry. I hadn't noted that you don't have direct pedal input....wojtek wrote:the reason i went for NuVinci was that i have a lot of hills to climb. Using HV 160 sensorLESS controller, i noticed that the drive without pedalling help [i am pedalling to charge my battery directly not as an additional drive] struggled to go uphill from standstill.
ions82 wrote:I'm also curious about any updates, as well. I am considering the same setup (3220 & NV) for a future build. I think I read that the NV 360 is supposed to handle 98 ft-lb and be safe up to 1,000 RPM. I'm not 100% sure, but I thought that I remember it having the same specs as the 171. Of course, maybe they were both underrated and just had the same numbers slapped on them. I'm hoping that my next build will be somewhere in the 3-4 Kw range. If there are any updates for this project, please post!
boostjuice wrote:BUT....... the built in slippage clutch is designed to slip before the spheres & drive/driven discs to protect them from galling due to breakthrough of the friction fluid. So, we could make an assumption that the clutch slip threshold is proportionally similar, but its still only a guess until someone measures it.
My practical experience with the N360 is that I can get the clutch to slip with heavy pedalling alone in the underdrive ratios quite repeatedly which doesn't give confidence for high electrical power being added. However, being that electric motors apply smooth torque delivery rather than high peak-torque pulsating pedal strokes, there would definately be some a margin for electric assistance, just probably not more than a few hundred Watts. In any case the clutch should protect the drivetrain for the most part, so dont be afraid to find the limits and report back.
BTW though, A friend has a staton-Inc 4-stroke, N171B build pushing ~3kw that he has never had hub slippage problems with, so if your pushing high power id go with that.
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