Mailing List flyrotary@lancaironline.net Message #57922
From: Michael McMahon <afm528@gmail.com>
Subject: RE: [FlyRotary] Re: Fixed Pitch props.
Date: Thu, 26 Apr 2012 09:30:57 -0700
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>
Ernest, you are my hero!

Mike

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Ernest Christley
Sent: Thursday, April 26, 2012 6:58 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Fixed Pitch props.

Bill Bradburry wrote:
Tom,

What engine/PSRU are you planning to put in your Venture?  It seems to me that you are going to have to do some thinking about this combination if you plan to use a Mazda engine.

 

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*From:* Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
*On Behalf Of *Thomas Giddings
 

Thanks for your info. I did contact Craig Catto and here is his response:

Hello Tom,

That is going to be quite a challenge to fit.   We make them for the 540
Berkut, and that is about a 285mph aircraft and have done one for a E-racer turbo 540 at 350HP doing over 300mph.

I do not think I want to challenge the auto conversion, just the power curve many times seems hard to fit. We know the curve of the Lyc engine very well and so not such a big deal to fit in these types of applications.  Easiest way for you to fit it is probably with a MT.

All the best,

Craig

 

I was surprised at his answer as i thought he did Tracy's prop. The speed of the Venture will not be that much more then what he described.
It may be the high HP I will be using.Any more suggestions would be appreciated.


Along the lines of using a 3D printer to shape that you glass, I built a CNC
mill to cut a form from soft wood that I glassed.  There was a learning
curve that took a while to get over...about the same 3 months that it would
take to get a Cato prop.  I could build another one in a week now for around
$100.  This one most likely has way to much pitch, but it will give me a
data point before I put a clock in the hub.


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