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Date: Wed, 22 Mar 2006 22:58:29 -0500
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] pitot inlet
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M Roberts wrote:

> Monty,
>
> When you suggested using a pitot style air intake for the cooling, 
> what exactly did you mean by 'pitot'. I envision it to be a tubular 
> structure that extends forward of the wing's leading edge, but would 
> the extension be a slight bump or a lance worthy of slaying dragons? 
> As it stands, I have about 32" from the leading edge for a duct to 
> feed a 4" thick, 13.5"x9" radiator. (I'm still trying to source a 
> radiator without going the custom build route.) I don't need any more 
> length to get a fully developed K&W streamlined duct, but if I need to 
> extend the opening out significantly from the leading edge it will 
> need to be incorporated into the design.
>
> Ernest,
>  
> I was a little unclear. I meant a standard leading edge inlet.

That is perfect then.  Well, as close as you can get with all the 
compromises you have to work through.  The duct will have to be 32".  If 
I try to move the radiator forward, the airfoil contour of the strake 
starts to cut the available area really fast.

>  
> I would locate the inlets in the outer portion of the prop arc. There 
> is much more velocity there for ground cooling. You have a unique 
> situation where that is possible.

The openings should be smack dab in the middle of the outer 1/3rd.  The 
center of the duct opening will be 31" off the fuselage's center line.  
I believe I'll be able to fit a 72" prop, but that is about the limit on 
a Delta.

This layout looks better every time I review it.

-- 
This is by far the hardest lesson about freedom. It goes against
instinct, and morality, to just sit back and watch people make
mistakes. We want to help them, which means control them and their
decisions, but in doing so we actually hurt them (and ourselves)."