Hi, fellow rotary enthusiasts.  I have a Ross 2.85 redrive on a

pusher

airplane. (SQ2000)  If I

understand it correctly, the ross 2.85 reverses the direction of

rotation, and the 2.17 does not?

If that is the case, it would seem that a 2.17 redrive would allow

me to

use a standard pusher

propeller, as on a LongEZ, Cozy, Veliocity, etc, whereas with the

2.85 I

must use a non-standard

propeller?
    I guess the other side of the coin is that I may realize more

power

at the higher RPMs that

the 2.85 will allow?   Thanks in advance for your replies.  Paul

Conner,

Mobile, AL

The 2.17:1 rotates backwards for a tractor Lycon so should also be

backwards

for a pusher Lycon. the 2.85 rotates correctly for a tractor Lycon so

should also

be correct for a pusher LyCon prop.

I would stick to the 2.85 any event for the additional take off power.

Paul Lamar

Hi, Paul....I looked at a Lycoming powered Cessna. When viewed from

the

cockpit, the prop turns clockwise, and on my friend's cozy, when viewed

from

behind the aircraft, the prop rotates counterclockwise, of course.
       You mentioned in your recent post that the rotary turns
counterclockwise when facing the flywheel. Since my 2.85 to 1 Ross will
reverse that direction, the prop will then rotate clockwise. Opposite

from a

Lycoming powered pusher.  Am I missing something?  Thanks again for your
reply.  Paul Conner

It is easy to check. Rotate the Ross input shaft clockwise looking
at it from the big end and watch what happens.

Paul Lamar

Paul Connor,
I like working from the cockpit, try to visually imagine the gears (cogs)
turning
a. so with the 13B rotating clockwise (from cockpit)- see above statement !

In Paul's pusher case the 13B rotates counter clockwise from the cockpit.

b.and you want your prop rotating clockwise (from cockpit)
c.with the C76 type Planetary gears -and your input shaft rotating
clockwise.
d.your planetary gears rotate opposite (anticlockwise)
e. your annular (ring gear) rotates the same way as your planetary
(anticlockwise)
f.so if you drive from the Annular (ring gear),while holding the planetary
housing, it's (anticlockwise) ie 2.17:1
g.if you drive from the Planetary housing and hold the annular it's
clockwise 2.85:1
Hope that helps !!
George (down under)

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