Building an electronic Angle of Attack indicator

jan olieslagers wrote:
who cares? schreef:
I would like to see a vain mounted on each wingtip

Great idea, yes. Any preference of vains in the glossy magazines?
For myself I'd much like Madonna and Prince - if they are more or less
balanced.



(or could it be you meant a couple of vanes? That's a whole another
story...)

Could be worse. He could have said 'veins' ;-)

--
Frank Stutzman
Bonanza N494B "Hula Girl"
Boise, ID

Frank Stutzman wrote:
jan olieslagers wrote:
who cares? schreef:
I would like to see a vain mounted on each wingtip
Great idea, yes. Any preference of vains in the glossy magazines?
For myself I'd much like Madonna and Prince - if they are more or less
balanced.



(or could it be you meant a couple of vanes? That's a whole another
story...)

Could be worse. He could have said 'veins' ;-)


Vain vanes, something in that vein?

Dan, U.S. Air Force, retired

"rich" wrote

Well of course, the best is to use an AOA vane, like the jets use. The
biggest problem is where the jets conveniently mount it on the side of
the fuselage, on most singles, that's right in the prop blast,
rendering it useless. If you could find someplace to mount it outside
of the prop blast, then it would work great. But finding that
place......

On a mast like a pitot tube, out on the wing.

I propose 4 or 5 microswitches with a mechanical linkage to go from the vane
to the switches in the wing. Send the signal to some led's, and you are
done. Cheap and easy.
--
Jim in NC

Morgans wrote:
"rich" wrote

Well of course, the best is to use an AOA vane, like the jets use. The
biggest problem is where the jets conveniently mount it on the side of
the fuselage, on most singles, that's right in the prop blast,
rendering it useless. If you could find someplace to mount it outside
of the prop blast, then it would work great. But finding that
place......

On a mast like a pitot tube, out on the wing.

I propose 4 or 5 microswitches with a mechanical linkage to go from the vane
to the switches in the wing. Send the signal to some led's, and you are
done. Cheap and easy.


That should be fun to calibrate, but once everything is secured it
should be reliable.

Dan, U.S. Air Force, retired

There is one central location that is not subject to prop blast,
exactly: - that's the nose cone of the prop.
Visualize a small hole set about an inch back from the front.
Use a local pressure sensor chip and a wireless transmitter.

The flow from off axis would module the air pressure slightly
one cycle per revolution, with amplitude in proportion to
AofA (maybe :-)

Brian W

rich wrote:
Well of course, the best is to use an AOA vane, like the jets use. The
biggest problem is where the jets conveniently mount it on the side of
the fuselage, on most singles, that's right in the prop blast,
rendering it useless. If you could find someplace to mount it outside
of the prop blast, then it would work great. But finding that
place......

On Mon, 11 May 2009 22:44:23 -0500, Brian Whatcott
wrote:

There is one central location that is not subject to prop blast,
exactly: - that's the nose cone of the prop.
Visualize a small hole set about an inch back from the front.
Use a local pressure sensor chip and a wireless transmitter.

The flow from off axis would module the air pressure slightly
one cycle per revolution, with amplitude in proportion to
AofA (maybe :-)

Brian W

The wiring might be a little tricky

"Brian Whatcott" wrote in message
news
There is one central location that is not subject to prop blast,
exactly: - that's the nose cone of the prop.
Visualize a small hole set about an inch back from the front.
Use a local pressure sensor chip and a wireless transmitter.

The flow from off axis would module the air pressure slightly
one cycle per revolution, with amplitude in proportion to
AofA (maybe :-)


Yeah, that sounds eaaaaasssy, and cheeeep, too!

NoT ! ! ! ;-)
--
Jim in NC

Ed wrote:
On Mon, 11 May 2009 22:44:23 -0500, Brian Whatcott
wrote:

There is one central location that is not subject to prop blast,
exactly: - that's the nose cone of the prop.
Visualize a small hole set about an inch back from the front.
Use a local pressure sensor chip and a wireless transmitter.

The flow from off axis would module the air pressure slightly
one cycle per revolution, with amplitude in proportion to
AofA (maybe :-)

Brian W

The wiring might be a little tricky

A wireless chip to a fixed receiver chip is not a biggie. But getting
that sensor chip and transmitter chip inside the nose cone in dynamic
balance would be an issue, I reckon....

Brian W

Morgans wrote:
"Brian Whatcott" wrote in message
news
There is one central location that is not subject to prop blast,
exactly: - that's the nose cone of the prop.
Visualize a small hole set about an inch back from the front.
Use a local pressure sensor chip and a wireless transmitter.

The flow from off axis would module the air pressure slightly
one cycle per revolution, with amplitude in proportion to
AofA (maybe :-)


Yeah, that sounds eaaaaasssy, and cheeeep, too!

NoT ! ! ! ;-)

I'm the one who likes the mouth organ reed, tube and wing slot approach
- but Experimental class is dedicated to folks who don't take the cheap,
easy approach!

Brian W

It is not a biggie if price is no concern. However, if you are trying to
bring it to market it is cost prohibitive.

Jim



"Brian Whatcott" wrote in message
...


The wiring might be a little tricky

A wireless chip to a fixed receiver chip is not a biggie. But getting that
sensor chip and transmitter chip inside the nose cone in dynamic balance
would be an issue, I reckon....

Brian W