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Comet Flap AOA  
User currently onlineFaro From Egypt, joined Aug 2007, 1754 posts, RR: 0
Posted (8 years 8 months 3 weeks 4 days 23 hours ago) and read 2265 times:

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Photo © Ralf Manteufel

it seems the inboard flaps are extended at over 70°. Assuming a nominal 5° angle of attack, this makes over 75° incidence with respect to prevailing airlflow. Did the air still follow the flap surface at this incidence or was it "unsticking"?


The chalice not my son
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User currently offlineDH106 From United Kingdom, joined Jun 2005, 627 posts, RR: 2
Reply 1, posted (8 years 8 months 3 weeks 4 days 22 hours ago) and read 2256 times:

The quick answer is that it didn't.

The inboard flaps you refer to are actually split type flaps positioned under the engine tail pipes and not designed to keep flow attached. The mid/outer flaps are 'plain' flaps (no slots or fowler movement).
On plain flaps like those the flow won't remain attached after something like 20-30deg depending on shape and other variables. Modern flaps use slots / multiple segments to encourage flow to stay attached over greater angles.
I've always thought the Comet had pretty large 'barn door flaps'. Perhaps since it's a first generation jet it's engines idled fairly fast and had high residual thrust - which would necessitate large drag flaps for the approach. Just a theory.

...I watched c-beams glitter in the dark near the Tanhauser Gate....
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