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Craig.Spainhower(at)exelo
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 Posted: Sun Feb 24, 2008 6:58 pm Post subject: Zenith-List Digest: LRI Probe Question |
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I think the reason pitot tubes and AOA probes protrude as far as they do from the wing is to clear the boundary layer of air on the wings surface, which would prevent getting an accurate indication.
Craig S.
N601XS, 601xl lyc 0-235, waiting for warmer weather to finish wiring and mount wings
Does anyone of you using a holes in the wing as a ports for AOA?
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pavel569
Joined: 21 Dec 2007
Posts: 77
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| Posted: Sun Feb 24, 2008 7:41 pm Post subject: Re: Zenith-List Digest: LRI Probe Question |
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| Craig.Spainhower(at)exelo wrote: | | I think the reason pitot tubes and AOA probes protrude as far as they do from the wing is to clear the boundary layer of air on the wings surface, which would prevent getting an accurate indication. |
I always thought that the AOA is actually measuring the difference of the air layer (pressure) on top and bottom of the wing. The pitot tube protrudes far from the wing not to be affected by the boundary layer on the bottom of the wing you are mentioning, because it measures air speed. The LRI probe has to be further away from the wing for the same reason. The high/low pressure holes are close together and the angle of their surfaces substitutes the wing profile. Just my $.02.
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_________________
Pavel
CA
Zodiac 601XL
Stratus Subaru EA-81
Tail, flaps, ailerons, wings, fuselage, canopy done ...
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grs-pms(at)comcast.net
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| Posted: Sun Feb 24, 2008 9:01 pm Post subject: Zenith-List Digest: LRI Probe Question |
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Aircraft Spruce sells the AOA Professional and AOA Sport angle of attack
indicators which sense the pressure above and below the leading edge thru
tiny ports which are flush to the surface.
George
do not archive
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craig(at)craigandjean.com
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| Posted: Sun Feb 24, 2008 10:02 pm Post subject: Zenith-List Digest: LRI Probe Question |
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Advanced Flight Systems sells a system with flush probes that has been
available for years.
http://www.advanced-flight-systems.com/Products/AOA/aoa.html
-- Craig
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dredmoody(at)cox.net
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| Posted: Mon Feb 25, 2008 4:46 am Post subject: Zenith-List Digest: LRI Probe Question |
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The Advanced Flight Systems AOA system uses flush mounted ports on the upper and lower surfaces of the wing for sensing AOA.
Dred
[quote][b]
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