Tracy, would the 2.85:1 handle the single rotor any differntly then

the 2.18.

6.5 B group what say you!
Tom Webber

Tom,

I am not certain I can justify the weight of a 400 hp redrive for a 100
hp ? single rotor engine. Most of all I am concerned about the gear
rattle aspect. Our 6.5 B engines will have 1/2 the number of 13 B torque
pulses for a given engine rpm. That might put the rattle at a rather
inconvenient prop rpm.

How about it Tracy, is there any reason to think that the 2.85:1 redrive
would have less rattle than the existing unit ?

Fred O.

The subject of 'gear drive rattle' is a bit more complicated than I can SWAG
right now.   I simply do not know what the RD-1 drive would do on a one
rotor.  I doubt that there would be any significant difference between the
2.18 and the 2.85 versions.

The main source of rattle in the Ross drive was actually the input shaft
banging back and forth between the eshaft and the ring gear.  The RD-1 is
practically immune to input shaft rattle due to two factors,  the thrust
bearing being one, but the main reason is that the input shaft is
hydraulicly damped by the oiling system.

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

 
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