Re: Europa-List: Cooling issues, once again!

[Paul McAllister <paul.the.aviator@gmail.com>]

H Frans,

I have a few questions. Have you tried 100% power in straight and level
flight.  If so, do you get sufficient cooling ?

If you are able to get sufficient cooling at 100 or even 115% power while
flying level then  you know that your radiator capacity is correct and you
have issues with the inlet at high angles of attack.

Another possibility is that air is flowing out of your NACA vents at  a high
angle of attack thus reversing the direction of air flow under the cowling
while climbing.  The reason this is a possibility is that the low pressure
area moves forward at higher angle of attacks.

A couple of suggestions.

1. A gentle flight around the pattern with an 'oil streak' test to see if
the diffusers are working as expected.
2. 100% level flight test to see if you have sufficient cooling capacity
3. Blocking the NACA vents and seeing if what happens in the climb.

Finally, Ron's suggestion of a spray bar is a good one, it will keep you
flying until you get this all figured out.

Good luck,  Paul