I took another look at the E4OD gearset- the tranny guy was right- it's

a straight swap for the c-6. What that means is that is is a complete swap
over- the whole works- ring gear, pinions and carrier, and sun gear replace
the C-6 ring, pinions and carrier, and sun gear. They should fit right in
the same space. Unfortunately, the steel carrier and six pinions are not
interchangable with the C-6 carrier and pinion set.

The three pinion and aluminum carrier should be more than stout enough

for a 200 hp engine.

The E4OD seems like it might be a canidate for a time to climb gearbox

or for air racing. The nice thing is that you should be able to change from
a 2.17/1 to a 2.75/1 ration with a simple swap of the gearset.

Brian Trubee
Redmond, WA

Tracy Crook wrote:

I had to order some more C6 parts from my supplier and asked him about the
six planet in the E4OD.  True, there is one and the entire set will
interchange as Brian said.  BUT,  this is the front planet set, not the
rear.  My drive uses the rear set which has the 4 planet set (and the
2.176 - 1 ratio).  Until we can make our own variable props, the 2.75 - 1
ratio is too much for 200 mph and up aircraft.  Would be fine for a slower
plane though.  The reason for this is a long story.  Many people have fallen
into the trap of going for the theoretical best configuration (i.e. longer &
slower props are better) only to find that real world considerations make it
the wrong choice.

Tracy Crook
rws@altavista.net
www.rotaryaviation.com

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