Quote:
Originally Posted by AdamHeard
I may be way off here..... but I think i'm quoting Dr. Joe Johnson here...
A planetary stage is about 85% efficient, so .85^2~ 72.
90% overall seems kind of fishy to me since that is the efficiency of a single spur gear reduction.
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I would agree but spur gears are 90%~95% efficient if designed correctly. and with 2 stages in this transmission that puts the efficiency at 81-90%. This is using the standard method of multiplying the number of stages by the efficiency . But in a planetary since there are much points of contact per stage it is not entirely accurate.
now knowing the history of these transmissions and how poorly they are crafted and not taking into account the multiple contact points per stage I would suspect it would be at the bottom of that range close to 80%.
what we really need is for someone to take a cim motor and create a testing torque curve. Then mount that same cim motor in the tranny and test it again. We can then find out the true looses in the system.
Anyone got a torque cell lying around?