It took two pieces of 5 x 2.5 inch. yes, the parts are flat. The parts are trimmed to fit.The cost of each was just under $10. and delivered to my door in 2 days, total was around $27. I really don't think the cooling is going to be a problem. The holes are big enough and as you can see, the blue push rod tubes of my motor are easy to see. The area of concern to me is how it will hold up to the heat of the motor. flying should be ok, but how about after the flight sitting on the ground when no air is passing thru it and the motor is still hot. Time will tell. I think this would be a great thing to have during the build, and not have to retro fit it. Then the installation would be cleaner. It's very hard for me to have to carve into a perfectly good cowl.
Last edited by jeffEE; 04-04-2014 at 12:47 PM.