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Posted for "Robert Smiley" <rsmiley@centurytel.net>:
Do we need to worry about getting engine exhaust gas intrusion
Good question
I don't smell anything and I can still count to ten and repeat my name. The duct is on the left side of the stab. I would assume that the stab NACA duct is above the slip stream where the exhaust gases would trail. There might be some lift along the fuselage but probably not high enough. You could smear the side of your fuselage with dirty oil, go for a flight and see the air flow stream as evidenced by the oil trails on the fuselage side.
I did such a thing, by accident and it does present a unique pattern. I changed oil and filter, checked filter for leaks, all ok. Ten hours later, I landed and the right side of my craft was smeared with oil, lost 4 quarts in one hour, lucky me. The filter evidently was not tight enough and the gasket blew out. The air flow rises gently over the wing, trails along the wing root angling downward and aft of the wing about two, three feet then gently sweeps upward toward the stab then again curves downward below the stabwhere the air flow is impacted by the stab. Very interesting for a graphic concept. Given this experience, I do not think you would get exhaust gases in a rear NACA duct on the H-stab as it is too high with respect to the exhaust outlet.
Bob Smiley
N94RJ
Do we need to worry about getting engine exhaust gas intrusion
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