Mailing List flyrotary@lancaironline.net Message #57195
From: Andrew Martin <andrew@martinag.com.au>
Subject: Re: [FlyRotary] Re: off topic, propeller carving and paint
Date: Thu, 22 Dec 2011 18:39:56 +0800
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
whats with assuming max rpm is 6000, I intend to use a CS prop with Tracy's 2.85 drive so I can rev the renesis out to 7500rpm when needed and dial it down when not, correct me if I'm wrong but doesn't more rpm + more fuel = more power. Ernest's drive should be able to withstand 8500-9000 rpm. Way to go! up there in Lynn's league.


Andrew

On Thu, Dec 22, 2011 at 4:08 AM, Bill Bradburry <bbradburry@bellsouth.net> wrote:
That is true, but if I was going to go with something else, I would try to
find something that will turn my prop close to the 2700 that most props are
designed for.  That means that I would look for something in the 2.2-2.4
ratio range, not 3.17.  That ratio will mean your prop will never get more
than 2000 rpm with the rotary.

Bill B

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Ernest Christley
Sent: Wednesday, December 21, 2011 2:26 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: off topic, propeller carving and paint

Bill Bradburry wrote:
> Tracy's PSRU ratio is either 2.17 turning backwards (A,B) or 2.85
> turning forward (C) I think??
>
>

And it is a good product; but, it's not the only PSRU in the world.


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