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From: "Michael McMahon" <afm528@gmail.com>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
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Subject: RE: [FlyRotary] Re: Fixed Pitch props.
Date: Thu, 26 Apr 2012 09:30:57 -0700
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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.
> 
>  
> 
> ----------------------------------------------------------------------
> --
> 
> *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.