Craymondw(at)aol.com
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 Posted: Tue Sep 07, 2010 8:55 am Post subject: Blended Foil |
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Glasair 2S FT, 200 hp Lycoming. I previously reported high oil temps after replacing my old prop with the new blended foil prop and wrongly thought the high temps were from the new prop working harder. Even with my high oil temperature my cylinder temps were below 300 degrees. So upon Glasairs' Harry DeLongs' advice I decided to redirect the air from cooling my rear right cylinder to my oil cooler inlet by installing a cooling fin insert on the aft portion of that cylinders' cooling fins. But as I was re installing my upper cowling I noticed that a piece of silicon seal had come off. On the top cowling there is step in the fiberglass that I filled with a bead of silicon. So I cleaned up that area and replaced it with a self stick 1.25 wide X 3/16 thick Camper Mounting (foam) Tape that I applied to 3M Hi-Strength 90 Spray adhesive. In between the two cowling reinforcement lay ups, I doubled up on the tape to make a continuous smooth seal that spans the width of my cowling. I also have a front baffle that blocks air from moving forward through the forward spinner fairing where I use a folded over truck inner tube riveted to an aluminum baffle in that area. I applied a strip of Camper Sealer tape on top of the inner tube to insure it doesn't leak air. After completing the installation I test flew the plane in 95 degree outside temps and that appeared to solve my problem of very high oil temps that once ranged as high as 220 to 230 degrees. I flew the plane in a 95 degree ambient temperature and recorded that my oil temperature had dropped to between 200 degrees to 209 degrees with a cylinder temperature increase of a few degrees to 305 degrees. After landing I shined a flash light into the inlets and could see that my rear engine baffling was firmly pressed against the newly installed Camper Mounting tape.
As I point of interest I met the engineer that designed and tested the new blended foil prop that he designed well over ten years ago. The engineer reported that he wasn't surprised that the prop added another 20 mph during the winter months and less during the higher temps of summer. When I reported that I could feel the prop in the airframe, he reported that the blended foil prop develops a "shock wave" near the tips and that was what I was feeling.
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