Paul Lamar wrote:

I think a six pinion ring gear held stationary with power out of the

planet

carrier on a A4OD 2.17 gear set will yield a 3.15 over all gear

reduction for an

RX8 based motor.

Huh?  I thought the 2.15:1 and 2.85:1 used the same gearset, and that the
difference was that the 2.17 held the planet carrier and let the prop

be driven by

the ring gear, whereas the 2.85 held the rign gear and lest the prop be

driven by

the planet carrier.  What were the gear tooth counts again?

Russell Kent

I used to think that as well but I was wrong. Two different planet sets.
And this is not all of them.

Paul Lamar

In a nutshell, I think this summarizes the two gear sets we are currently
looking at:

Real World Solution's current RD-1A & RD-1B:
Input : sun gear
Output = Ring Gear : Ratio = -2.17, (reverse of input.)

If Output = Planet carrier (not like RD-1A&B but like Ken Welter's Ross
drive): Ratio = +3.17 (same rotation as input)

Real World Solution's planned RD-1C
Input : Sun gear
Output : Planet carrier : Ratio = +2.85 (same rotation as input)

If Output = Ring gear (not like RD-1C) : Ratio = -1.85 (reverse of input)

Mike McGee, RV-4 N996RV, O320-E2G, Hillsboro, OR
13B in gestation mode

 
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