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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-361678@logan.com>
Subject: Re: [FlyRotary] Re: C drive
Date: Wed, 11 Aug 2004 18:52:03 -0400
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The way it appears to me, Dave, is that if you stick with the C6 (or what
ever the later versions of the Ford Planetary gear set are called now) then
you gets what you gets.  The Sun gear rotates in the same direction as you
engine (in both cases).  So the only other parts are the Planetary holder
with its pinion gears and the Ring gear.  One must be fixed and one can
rotate (either one - it doesn't matter to the gear box - just to you and me
and the prop) so that is how you end up with the two gear ratios and the two
directions of rotation of the prop.

Now, I am certain you could add more gears and get the prop turning in the
"right" direction, but then you no longer have the simplicity of Tracy's
gear box and more weight, longer?, cost, etc.

Since I dislike fiberglass work, I empathize with your views.  We will see
if I end up needing to do any rework of cowling or Fin angle - hope not, but
for the performance I saw with Tracy's RV-4 and this set up, I knew I had to
have one.

Ed

Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message ----- 
From: <daveleonard@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, August 11, 2004 5:29 PM
Subject: [FlyRotary] Re: C drive


> Ed, does that mean it might not be too hard for Tracy to make drives that
turn either way?  I refuese to re-do my cowl, vert. stab. and engine mount
to put on a right turning gear drive.  But how hard would it be to make a
left turning C-drive?
>
> Dave Leonard
>
> >
> > Got my new conversion C drive from Tracy today.  Looks great, will start
working soon to put it and prop on the aircraft.
> >
> > However, after close examination of the drive, I wish to state that it
turns out the RING gear IS Fixed on the 2.85.  The propeller shaft is driven
by the planetary gear housing (which now rotates)  which is driven (of
course ) by the SUN gear.  This arrangement  is the opposite of the 2.14
where the ring gear rotates and drives the prop shaft and the planetary is
fixed. The Sun gear drives the planetary in both cases.
> >
> > Someone took issue with my earlier speculation that this was the case
with the C drive and not being a gear box guy I declined to argue the point.
However, in this case, it turns out after rotating the prop shaft it was
clear what internal parts rotated and which did not.  The ring gear does not
and the planetary does (on the C drive).
> >
> >
> >
> > Ed
> >
> > Ed Anderson
> > RV-6A N494BW Rotary Powered
> > Matthews, NC
> >
>
>
> >>  Homepage:  http://www.flyrotary.com/
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>