? The fan is a great idea, however there must be some drag or cooling penalty to pay while in the air? Al, have you made more changes to your "through the wing" cooling system or are you still using/experimenting w/ it?

Jarrett

I haven’t noticed any reduction in cooling while in the air after adding the fan.  I think the amount of air flow is the same - determined more by the inlet area of the scoop.  I suspect there is some additional pressure drop, so a bit of cooling drag; but since I don't have an exit ducting on the radiator anyway, the difference is likely not noticeable.

I made a more effective inlet scoop for the in-wing oil cooler, and that is working fine. I haven’t made any changes on the second coolant radiator that is in the other wing.  Although it is not very effective due insufficient air flow, the in-cowl radiator is very effective, so overall things are fine.  At some point I am going to experiment with the exit faring to see if that might be a better solution than changing the inlet.  If that radiator can be made more effective, I can reduce the size of the scoop on the in-cowl rad to reduce some drag.  All in due course . . .

Al