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Date: Tue, 10 Feb 2009 18:40:51 -0600
From: Charlie England <ceengland@bellsouth.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Catto Prop
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The Mallorys wrote:
> One step forward, two steps back.
>
> I installed the prop yesterday, then put the cowlings back on just to see
> how it all looked together.  The Catto prop is beautiful, and I am sure will
> pull the plane through the air with the greatest of ease.  But it interfered
> with the cowling.
>
> You can sort of see in the picture that the porp is very thick, and the hub
> is not the most aft portion.  The back of the blades actually are behind the
> prop hub, and hit the front of the intake.  It isn't a real big deal, I
> ordered a spacer today from Saber ($400).  I only needed about 3/8 inch, but
> the smallest spacer is 1", so that's what I got.
>
> For those that haven't yet fit their cowling and are planning on using the
> Catto prop, you can save yourself the extra expense.  Don't use the aprox
> 1/4" aft of the prop flange as the measurement for your cowling, take into
> account the prop itself.
>
> Hopefully this saves someone some time and money.
>
> Chris
Wow, Chris, there's got to be a better (cheaper) way than that. The 
front crush plates from Van's for their fixed pitch prop spinners range 
from around $36 to $55.  If you want, I'll check the diameter tomorrow 
when I go back down to the hangar. I'll bet that they are big enough 
(diameter) to do the job.

Charlie