How is the gear ratio calculated?. Do both props turn at the same load but different RPM?.
Thanks
Ray

I suggest you check this link first: http://www.rcuniverse.com/forum/elec...rn-planes.html

Hey Ray,

The gear ratio is calculated by assuming that both props spin in opposite directions, but at the same rpm.

With this assumption, the derivation for the gear ratio formula results in this:

R = (1 + 2*(Nring/Npinion))

R = Gear Ratio
Nring = Number of Teeth on the Ring Gear
Npinion = Number of Teeth on the Pinion Gear

In operation the assumption isn't exactly true because the speed of the two props change as a function of airspeed and power loading, which causes the actual gear ratio to adaptively change during a flight.

Brenner ...

Thanks for the explanation I am going to show my installation at our next club meeting and know I will be asked this question. A great unit well designed and manufactured and worth the money.

Thanks again Ray
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