Karl
A big hole doesn't let in any more air than a small one when the air
can't get out easily. One or two Europas have small inlets and AFAIK
they cool just as well
graham
Karl Heindl wrote:
> - What I would like is a variable opening at the bottom of the cowl
> with a louvred door. Open it wide when climbing, scooping in masses of
> air when drag is not an issue, and close it in the cruise.
>
> Karl
>
>
>> From: Gilles Thesee <Gilles.Thesee@ac-grenoble.fr>
>> Reply-To: europa-list@matronics.com
>> To: europa-list@matronics.com
>> Subject: Re: Europa-List: Oil cooler thermostat
>> Date: Tue, 14 Nov 2006 21:48:48 +0100
>>
>> <Gilles.Thesee@ac-grenoble.fr>
>>
>> Svein and all,
>>
>>> From that perspective baffles/part-covers in front of the coolers
>>> would be better, especially if I could make them in-flight
>>> adjustable (which I can if I wish). The issue is how best to arrange
>>> it.
>>
>>
>> It is best to place a flap at the exit of the cowl/radiator duct.
>> Placing an obstruction in the front destroys dynamic pressure. An we
>> need to recover as much pressure as we can to persuade the air to
>> flow across the rad core.
>> A carefully designed diffuser is key.
>> Having a large hole with partly covered radiators inside, is like
>> having a deployed air-brake.
>>
>> And we don't need a permanent air-brake, do we ?
>>
>> Regards,
>> Gilles Thesee
>> Grenoble, France
>> http://contrails.free.fr
>>
>>
>>
>>
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>>
>
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