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Why is that?
Tracy made the comment that even the 2.85 which I have is only really useful for props >than 74”
Which I understood to be about the tip speed being to low and inefficient with smaller diameter.
I dont want to spin my engine more than 7500 rpm.
What am I missing?
Steve
> On 27 Nov 2020, at 7:03 am, Ernest Christley echristley@att.net <flyrotary@lancaironline.net> wrote:
>
> At 70 inches, you would want to go the other way. The C4 gearset was 3.17, but the problem was the weak planetary gear carrier. But, I just posted a link with a 6 planet carrier.
>
> On Thursday, November 26, 2020, 5:56:14 PM EST, Stephen Izett stephen.izett@gmail.com <flyrotary@lancaironline.net> wrote:
>
>
> On that note can I ask a gearbox question.
> I’ve always understood we only really had the choice of 2.17 and 2.85 :1 gear ratio options if using the Ford planetary gears.
>
> Looking at our Glasair and I imagine some other aircraft with prop diameters of around 70 inches we would prefer a ration around 2.6:1
> giving us I think a better prop rpm and tip speed.
>
> Are there other options?
>
> Steve Izett
>
>
>
> > On 27 Nov 2020, at 6:32 am, Ernest Christley echristley@att.net <flyrotary@lancaironline.net> wrote:
> >
> > Is that the 4 planet, C4 gear set? If so, I've been made to understand that there aluminum body gets wallowed out by the planet gear's shaft. I recently found that there is a performance shop selling a replacement unit with six planets. I know nothing about them other than that.
> >
> > https://speedmaster79.com/Ford-C4-Transmission-Performance-6-Pinion-Planetary-Gear-Set
> >
> > On Thursday, November 26, 2020, 3:16:01 PM EST, Le Roux Breytenbach breytenbachleroux@gmail.com <flyrotary@lancaironline.net> wrote:
> >
> >
> > Terry : Thanks Terry for the Ross Redrive the parcel arrived on Monday 23 Nov .
> > Neil if you want some dimensions on the hollow propellor shaft your welcome.
> > Regards
> >
> >
> > Sent from my iPhone
> > Le Roux Breytenbach--
> > Homepage: http://www.flyrotary.com/
> > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html
>
>
> --
> Homepage: http://www.flyrotary.com/
> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html
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