Right again,Gilles :-)
The area of intake required to cool an O-360 Lycoming on a Long EZ is
about 14 square inches, but only if everything inside the cowling is
optimised, baffling, pressure recovery ducts etc.There are several EZs
with inlets this small. Most of them use exhaust extraction to help
cooling on the ground.
Graham
Gilles Thesee wrote:
> <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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