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

"Del Johnson, North Point Solutions, Inc" wrote:

A Glastar Builder, that lives near me, bought the firewall forward Subaru
package from Crossflow.  It included their redrive.  The redrive failed
during the initial flight testing phase.  The builder received poor support
from Crossflow and eventually purchased the Firewall forward Subaru setup
from NSI.

I am surprised at that. It looks bullet proof for a Subaru. 
Just way too heavy. What failed?

Paul Lamar

 
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