Archie wrote:

Archie wrote:

Just another trade-off guys.
Helical gears = Quiet, Thrust effect, and limited strength.
Spur gears= Noisy, No thrust, and high strength.
Somewhere there is a median compromise per hp.
Archie

I am not sure I agree on the strength issue Archie.

Paul Lamar

Tried to employ the KISS method here, Paul.
Indeed there are variables, but when designing
high loaded industrial gearboxes in a previous
life, the equations for load, hp loss, stress, mfg.
costs, etc. the spur came out on top for these
applications.
Archie

No doubt about it. The end thrust from helicals has been a pain in the 
a** for us. If we had an easy to adapt, low cost and strong enough spur gear 
planetary we would be in rotary engine PSRU heaven.

Paul Lamar
 
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