Paul
I'm sorry maybe I should've been more clear . The picture was not to
reference the "type" of gear box ,rather that it was a gearbox made
out of carbon. So planetary redrive housing made out of carbon.
Can you refresh my memory as to which gear set to use.

Tony


Tony and group,


How about a welded 4130 case?  My pencil sketch looks like less than 9.8
lbs case with a 12.5" length and 6.5" OD mounting flange.  I haven't
talked to a machine shop yet to see if the machining is practical.  -
machine parts, weld, stress relieve/anneal, rough machine, HT to
RC40-43, grind to final dimensions 4-5 surfaces.

For attaching the planetary to the main shaft, a how about cut off the
spline stub (about .90), countersink inside for bolt heads and machine
for thrust washer(s), and bolt to the 2.5 (or so) OD main shaft, as well
as bolt on the prop flange?  Can we use flat head fasteners to reduce
thicknesses (ie. weight) and provide thrust washer surface?  See Nov 29
post.

Dan F