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Take a look at www.aluminiumradiators.com
They produce the Rotax radiators. The quality is high, support is
excellent and the prices are very reasonable.
They are also quite easy at building radiators at custom spec. I had
my special radiator made there too.
If you replace the standard SX-radiator, you might consider to make it
"thinner" (less "depth"). Although this sounds contradictionary, this
improves the airflow through the radiator and enhances cooling. The
standard radiator is way too thick.
Think about it this way: the air flowing through the radiator is
picking up heat. When it arrives at the rear half of the radiator, the
air has been warmed up during its journey through the front half, and
is unable to offer much further cooling.
The math says that if you double the depth of the radiator with 100%,
it only offers 25% more cooling. However the airflow reduces due to
internal friction, so at some point a thicker radiator will even offer
less cooling than a thinner one. The Europa-XS radiator is way past
the top of that curve, especially at lower airspeeds (like on the ground).
You won't find such a thick radiator in other modern airplanes. Yes,
the P51 had a thick radiator, but it was flying with quite a different
speed than your Europa.
In my airplane I have a thin radiator, and it was only when I took out
the large bulky radiator that all my cooling issues disappeared.
So, if you have to swap your radiator anyway, it might well worth it
to allow for a little improvement.
Frans
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