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Skip, ...
...if I may offer a comment?
'Stall' is when the airflow breaks away from (normally) the upper surface... and 'lift' is irrelevant. As the wind-tunnel guy said, the wing stalls at an angle, not a velocity.
A Lancair or any wing can be generating 5 PSF or 50 PSF or 500 PSF, and it will still stall at the same angle... say 15 degrees, or whatever.
I don't have any idea what the Chelton does, but wind-to-wing ANGLE is all that you need, to see and avoid stalling, or to unstall.
Its ANGLE ANGLE ANGLE.
Respectfully offered : )
Terrence N211AL
----- Original Message ----- From: "Skip Slater" <skipslater@earthlink.net>
To: "Lancair Mailing List" <lml@lancaironline.net>
Sent: Sunday, April 30, 2006 12:53 PM
Subject: [LML] Re: AOA
Kevin,
My understanding is that Chelton computes AOA rather than actually
measure the lift the wing is creating, using inputs provided by the
operator. If that's incorrect, I hope one of the Chelton gurus will correct
me. The AOA Pro or Sport measure actual lift by comparing pressure on the
top and bottom of the wing. Based upon that, my impression is that they're
more accurate.
Sip Slater
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