What planetary gears are you referring to? I'm looking for something
 from 100 hp to 500 hp.

 Rob Miller

 Ford C6 auto tranny and derivatives.

 Paul Lamar

 Thank you! From all that I've read most seem to prefer single spur
 cut gears and there hasn't been much that I've found about the
 planetary set ups, other than I know they were used in the big
 radials, but most have said they aren't as reliable as spurs (but
 just looking, there are alot of ford trans that have them and run
 their lifetime just fine) the place I've found last fo info generally
 doesn't like psrus...but my thought is every turboprop on the planet
 runs behind one just fine. There shouldn't be any reason a rotary (or
 any auto conversion) couldn't use similar set ups

Rob Miller

For a given gear width a planetary is six times stronger.
In fact there is an optimum  ratio of width to diameter so spur gears cannot
be made much wider. In that case a planetary is the only solution.

All aircraft engines, with the exception of the V12s and rotax, have been planetary
for the last 75 years. That includes the big corncob P&W 4360's.

Another problem with spur gears when the box heats up the tooth mesh
becomes less.

 Here is what a high power spur gear box looks like. We call
it the rock crusher. It is HEAVY. You can imagine what it weighs.

These Ford planetary parts are used in the 650 foot pound Power Stroke diesel

If you want a planetary stronger than the Ford you can go with an Allison
truck TX.  Here is a picture.. Ford on the left Allison on the right.

Here is the Bell 47 helicopter final drive we are using in the TTC. It is rated
at 1000 HP by Bell engineers. If you can find one they are $30,000.

Paul Lamar


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