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Date: Sat, 12 Apr 2008 12:03:29 -0400
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From: "Colyn Case at earthlink" <colyncase@earthlink.net>
References: <list-2844689@logan.com>
Subject: Re: [LML] Re: IVP fresh air valve
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I have no experience with the tail naca vent since the previous owner of my 
airplane closed it up.
However, I've heard from a number of people that have the flapper valve that 
they eventually went with a servo to positively close the flapper for 
pressurization.

As for capacity,  I haven't heard any LIVP owner say he had too much cabin 
ventilation.   ....and I've heard a lot that went to a/c in operating 
conditions that would be completely tolerable in a cessna.

Personally, I've found that ground ops are the biggest problem relative to 
ventilation.   having the door cracked open an inch or two is enough for me 
though.  I'm thinking of making a little jig to hold the door open when one 
set of latches is hooked.

I think if I were to do it over again, I would make a big fat door, maybe 4" 
x 4" or bigger, to stick out into the prop blast and catch some air when on 
the ground.   some engineering required.

Colyn