What's the purpose of the fairing on fuselage, near leading edge of the wing?
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It's not a step ,, engineer confirms it improves airflow on wing at certain angle.of.attack and delay stalls – Knight Nov 14 '18 at 18:40
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That “fin” is not there on a stock Cessna 421. It's part of the RAM modification as pointed out by Mike Sowsun. That fin corrects airflow over the wing (probably at high angle-of-attack conditions) which is perturbed by the presence of the fuselage and thereby delays the stall for that portion of the wing near the root. In essence, it "tricks" the portion of the wing near the fuselage into thinking that the fuselage isn't there.
I invite anyone else with information on the RAM mod package to add more detail in a comment and I will edit this answer accordingly.
niels nielsen
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That “fin” is not there on a stock Cessna 421. It was added when the RAM modification was done. – Mike Sowsun Nov 14 '18 at 22:20
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Alone with the winglets , it's only available on ram conversation Cessna only . (When comparing with other Cessna 400 series) – Knight Nov 15 '18 at 02:53