REFLECTOR: Cowl flaps better oil temps

[Andrew Ellzey]

The butterfly valve is just an example. If you are still in the build phase 
as I am, you could recess a hinged flap in the floor of the NACA scoop that 
would be flush when retracted. The whole point of cowl flaps is to have 
control of your air volume for different flying conditions. I don't have 
access to a wind tunnel to test for the correct location of adjustable VG's 
to change the laminar flow into our NACA scoops. If your aircraft can 
maintain normal operating temperatures (cylinder head and oil temps) and oil 
pressure without cowl flaps, then they wouldn't be needed.

Again my thoughts your airplane not all cases are the same.

Andy Ellzey

----- Original Message ----- 
From: "Scott Derrick" <scott at tnstaafl.net>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Thursday, February 23, 2006 9:40 AM
Subject: Re: REFLECTOR: Cowl flaps better oil temps


> Andy,
>
> I have always wondered why the big bore V's didn't have some kind of cowl 
> flap.
> Because we are using NACA's I would think it may be possible to reduce the 
> cooling air in a much simpler fashion than butterfly's inside the NACA's.
> Since very small VG's if placed right can induce laminar flow, mightn't a 
> particular placement disrupt the flow into the NACA and thus reduce the 
> airflow?
> Scott
>> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
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