Left turning C drive -- basically cannot be done, unless a totally different gear set were used (maybe not even then). The reason 2.17 turns left and 2.85 turns right is making use of which set of gears drives the prop. If you take the power off the ring gear, you get rotation reversal, if you take it off the planetaries, you get same direction rotation, and a higher reduction factor.

By the way, this is how your automatic transmission works, (where the gears come from), a band clamp holds the ring gear steady for forward, taking power off the planets, and for reverse, they hold the planets stationary and take the power off the ring gear. Then you go backwards.

Bill Schertz
KIS Cruiser # 4045
----- Original Message -----
From: daveleonard@cox.net [mailto:daveleonard@cox.net]
Sent: 8/11/2004 2:29:33 PM
To: flyrotary@lancaironline.net
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
> >
>
>
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