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AoA

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haywire(at)telus.net
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Posted: Sun Jan 01, 2006 1:58 am Post subject: AoA



Hi Kevin

Kevin, don't be puzzled , because you're right. It was late and I didn't

feel like getting to in depth about it, but even as I sent it, I knew

somebody would call me on it. I'm certain that you have a better grasp on it

than I ever will, but what I should have said is that the PSS unit directly

measures air pressures on the top & bottom of the wing is actually measuring

the lift being produced, which most people simply refer to as angle of

attack, and lift really is what we want to know. (at least this is how I

understand it). The vane type is the only unit that truly measures angle of

attack directly. I feel that the PSS system is probably the most accurate as

it is measuring the component that is actually keeping us up in the air and

that is lift. I have to be honest and admit that I really don't know exactly

how Dynon is measuring it, but as they only have a single sense line plumbed

to the back of the pitot and then use the pitot $ static inputs, I can only

assume that it is inferential measurement, since they can't be getting any

direct measurement of angle of attack or lift on the wings. In any case, I

have found it to be as accurate as the PSS unit.

Ed, good grief, don't you ever sleep? I thought you already had allot of

projects on the go, now you tell us you're working on an AOA device.

Todd (I hope when I retire I can be as busy as Ed)

HAPPY NEW YEAR TO ALL

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eanderson(at)carolina.rr.
Guest

Posted: Sun Jan 01, 2006 6:35 am Post subject: AoA



Yes, Dan. A good article - and if you don't have an extra airspeed

indicator you can order a 2" H20 differential pressure gauge which will also

do the job (and less expensive - as its not an aircraft part)

Ed Anderson

Rv-6A N494BW Rotary Powered

Matthews, NC

eanderson(at)carolina.rr.com

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eanderson(at)carolina.rr.
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Posted: Sun Jan 01, 2006 6:45 am Post subject: AoA

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eanderson(at)carolina.rr.
Guest

Posted: Sun Jan 01, 2006 6:46 am Post subject: AoA



Hi Dan,

Actually at this point I am using a different probe for the AOA sensing than

the pitot tube. Its basically a bar of aluminum with a port drilled on one

side pointing into the air stream and one on the bottom of the bar This

probe is then mounted at an approx 65 Deg angle to the wing (pointing into

the airflow) so that both ports see the dynamic pressure. Then as AOA

varies - one port sees more/or less of the dynamic pressure component of

interest than the other port giving a pressure differential proportional to

the AOA..

However, my next version will probably be a combination of pitot tube and

AOA probe, it this one the AOA sensing ports will only be 45Deg apart to

make the probe serve as both a pitot pickup and AOA sensor.

I have a heated pitot tube, but had not looked into heating the AOA as I am

a dedicated VFR pilot. But, machining an insert for a heating element might

not be that bad, will have to look into it.

Ed

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