Quote:
Originally Posted by hharney
When Cessna introduced the 336 in 1964 it didn't have the upper scoop and relied on a fan driven by the engine to pull heat from the rear cowl. There was one large cowl flap at the top center of the cowling to allow air to be introduced to the cowling mechanically. It worked ok but there were some rear heat issues that has plagued the design ever since. You can always identify a pilot that has never flown a 337 Skymaster because they think and ask about the rear heat problem. There really isn't a rear heating problem on the 337 design with the upper scoop and mechanical cowl flaps on each side of the cowl. When the turbo version was produced the cowl flap size was increased about 25% and that carried on to the pressurized version beginning in 1973 with the G model change. All 500 or so military built 337's had these larger cowl doors even though they were all normal aspirated….
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Mr. Haney, thanks for just getting me registered. Great forum! The 336 is on my “someday” list, so I was very attuned to your backstory on its unique cooling problems. One of my biggest questions is whether there are any legal STC’d mods to address this? Like mounting the 337-style scoop on top? Or others maybe commercially available? IIRC, Aviation Enterprises sells a replacement heavily-louvered lower cowl panel that mounts beneath the rear prop. Is it applicable to the 336? Does anyone know if it helps? Or can later-style 337 cowl flaps be fitted? I live in South Florida and my home airport (KPMP Pompano Airpark) has 3 very busy flight schools, so waiting on the hot ramp is a way of life for me.
Great tips on cocking into the wind and bumping up rpm on the front engine.