Dan Ruggirello wrote:

Here is another redrive that is available from Crossflow in Canada.  It is 60 lbs and uses a
scaled down design of the Rolls Royce Merlin gearbox.  They have a 13B sitting in the shop right
now and are considering making an adapter to fit to it.  It is rated to 400HP continuous, hence
the reason it weighs so much.

The assemblies on each side of the gearbox is a vaccum pump and prop governor - these items are
optional.   Just another datapoint.........

Dan

I think it would be twenty pounds lighter with a planetary instead of an internal spur
gear. Internal spur gears have real problems with input shaft deflection and bending loads.
All loads in a spur gear planetary are balanced.
I also think they are being optimistic about the load rating.
For a given gear width the planetary has six times the line contact length.
Line contact length is the critical parameter in a gear set.
 
Paul Lamar


Paul Lamar
 
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