> Hi, Paul....yes, I had planned on high temp RTV between the aluminum
     > extension plate and the radiator. Just wanted to see if anyone saw any
     > problems with it before applying the somewhat difficult to remove silicone
     > gasket material.
     >      Regarding the last two pictures....the first is just another angle
     > showing the aluminum extension, and the last picture is looking directly
     > into the NACA duct, showing how I ground, filed and sanded a radius at the
     > top of the duct (bottom of firewall) as well as showing the new aluminum
     > plate at the bottom.  (Shows both the new radius as well as the new aluminum
     > extension extending 2 inches into the NACA duct). Note that the 3/8 inch lip
     > that previously extended down into the duct has been removed and replaced
     > with a radiused corner.
     >      Yep...got a cold snap down here. It was only 71 degrees today.  Should
     > be 72 tomorrow, but back up to 80 on Thursday and Friday.  Will probably fly
     > it Thursday or Friday to conduct a fair evaluation of the cooling, as it was
     > 80 degrees the last time I flew it and recorded my oil and water temps. Like
     > to keep the test conditions as close as possible to know how much
     > improvement was obtained.  Will apply silicone and the 6 mounting blind
     > nuts/screws tomorrow and it will be ready for testing. After noticing and
     > removing approximately 3/8 inch of firewall sticking directly into the path
     > of incoming air at the top of the duct, it's a wonder it cooled at all.
     >      Thanks again for your advice and assistance.  Paul Conner
     >

     I see another problem from the latest pictures but will wait for additional
     test data.

     Paul Lamar

Last time I took a piece of paper, held it on edge in both hands in front of my face and blew hard, it buzzed like...well a piece of paper with high velocity air going across it with the leading
edge oscillating up and down relative to the incoming air!  Perhaps one ought to look at the NACA/NASA cowl leading edges??  Either REALLY stiff or blunted leading edge.

If not....that edge could resonate to failure in pretty short order or at the very least create a buzzzzzzing sound over the airport that will bring lots of heads out of hangars to observe the
phenomenon.  The theory is pretty simple, but the paper test is a lot quicker.

Doug in CO

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