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From: "George Lendich" <lendich@optusnet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-1028447@logan.com>
Subject: Re: [FlyRotary] Trials and tribulations of secondhand projects
Date: Sat, 2 Jul 2005 08:32:59 +1000
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Hmmm, seems to be the wrong planetary!!

There are 3 planetaries in the Ford gear box Front 2.85/3.85; rear 21.7/3.17
and the Overdrive - that looks like the overdrive to me, as I have both the
front and rear and that one looks smaller.
Hence the disappointment I guess!!

Perhaps asking for some advise first may have saved you a few dollars.
George ( down under)

> I was told, or at least made to understand, or...well...I'm not even
> sure anymore (I think I'm getting old).  But I thought that the gearset
> in my custom built PSRU came from a C4 transmission.  I was even told,
> by a transmission technician, that the gearset I had was used in busses
> (sp?), but after several warnings I thought it would be a good idea to
> switch the 3-pinion planet for a 6-pinion.  It was only $218...cheap
> peace of mind, even if it didn't make any difference.
>
> The part came yesterday.  Props to those of you who can figure out why I
> feel a little disappointment.
>
> Can anybody shed any light onto what I have on my hands from the
> pictures?  The only thing I know for sure is that the smaller set is
> indeed a C4 forward gear set.
>
> BTW, ratios.  For you guys wanting to run PPs at high RPM and willing to
> build their own reduction unit, this may be an excellent choice.  I
> counted sun and ring gear teeth, but can't remember the exact count.
> But with a locked ring, and taking the output from the planet splines,
> you'd get a reduction of somewhere around 3.2.   I'll count again when I
> get home if anyone is really interested.
>
>


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