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Cooling baffles for A-75

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SteveR

Active Member
Joined
Jan 11, 2005
Messages
37
Location
Norman, OK
I want to replace the J-3 cub style "eyebrows" on my Pietenpol Aircamper. I can't seem to stop all the cracks in these things.

I would like to build essentially a square baffle, instead of the rounded design like the J3 baffle. What are the design considerations for these baffles? The only criteria I believe I've ever seen is that you are to have a certain pressure differential between the top and bottom of the cylinders to maintain adequate cooling. Obviously that would be very difficult to calculate accurately.

My plan is to essentially match the frontal area of the J3 baffle, and have a similar downard taper towards the rear of the baffle. My guess is that this is to increase pressure above the cylinders, to maintain adequate cooling flow accross the cylinders.

What am I missing? Who else here has created their own baffles, and what am I not thinking about? I fly this plane a LOT, so these have to work right.
 
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