?? Lift Reserve Indicator ??

"Dan, U.S. Air Force, retired" wrote in
news:w3xIf.1376$et.1235@dukeread12:

.Blueskies. wrote:
"Bill Daniels" bildan@comcast-dot-net wrote in message
...

"Dan, U.S. Air Force, retired" wrote in message
...


A couple of years ago Kitplanes had an article about and AOA
sytem that used 2 ports flush with the wing surface
near the wing tips. It's a simplified version of a system the
military has been using for decades. The military version uses a
conical probe sticking out of the side of the fuselage. There are
two sets of slots a few degrees part facing towards the front of the
airplane. These slots are ports that send air pressure to two
sensing chambers. Here's where they decided to get complicated: the
cone is then driven until the chamber measure equal pressure. The
cone's position is then transmitted to an indicator. Obviously the
system isn't for single engine tractor airplane. The 3.125"
indicator is a tad big for most homebuilts, but does contain
switches for stall warning and AOA indexer lights. It seems to me
some enterprising electronics genius should be able to design a
simple system that does all this in solid state.

Dan, U.S. Air Force, retired

I'd also like an electronic AOA indicator. There are several probes
that work on three pressure pickups like
(http://www.cgmasi.com/aviation/index.html). In sailplanes we can
just tape a couple of yarns of the side of the canopy and mark the
inside with grease pencil.

bildan



Here is an electronic version:
http://advanced-control-systems.com/AOA/aoa.htm

Two pickups; one on the top of the wing and one on the bottom...


That's the system I waas thinking of.


Dan, U.S. Air Force, retired

I plan on putting this one in my Sonex:

http://www.ch601.org/resources/aoa/aoa.htm

--
-- ET :-)

"A common mistake people make when trying to design something
completely foolproof is to underestimate the ingenuity of complete
fools."---- Douglas Adams

Hmmm....

http://www.waldowrights.com/pictures.asp

Check out the 8th photo down, left hand column. Watever that thingy
is... I remember it being an airspeed indicator, but I could be wrong.
Its been a while.

I shared a hangar with these guys at Celebrate Freedon 2004 in Camden,
SC. Rob is a really nice guy and is only about 6'7". Dunno how he fits
in that plane. His tent was off to the left of Kermett Weeks' P51-C. I
was to the right and behind. The Berlin airlift Museum's C-54 was just
to the right of me. I went up with him and 3 other fellows at dusk on
Sunday night after the show. Extremely cool.

Any guesses on who invented the vane-type AOA? I'm gonna have to look
that one up. I know that Orville was working with similar devices from
about 1909 through the 1920's. Early Wright machines were extremely
pitch sensitive. Most had an AOA window of -2 to +10 degrees. Any more
or less could, and frequently did, mean death.

Harry

"wright1902glider" wrote in message
oups.com...
Hmmm....

http://www.waldowrights.com/pictures.asp

Check out the 8th photo down, left hand column. Watever that thingy
is... I remember it being an airspeed indicator, but I could be wrong.
Its been a while.

I shared a hangar with these guys at Celebrate Freedon 2004 in Camden,
SC. Rob is a really nice guy and is only about 6'7". Dunno how he fits
in that plane. His tent was off to the left of Kermett Weeks' P51-C. I
was to the right and behind. The Berlin airlift Museum's C-54 was just
to the right of me. I went up with him and 3 other fellows at dusk on
Sunday night after the show. Extremely cool.

Any guesses on who invented the vane-type AOA? I'm gonna have to look
that one up. I know that Orville was working with similar devices from
about 1909 through the 1920's. Early Wright machines were extremely
pitch sensitive. Most had an AOA window of -2 to +10 degrees. Any more
or less could, and frequently did, mean death.

Harry


I'm pretty sure that the thingy in the photo is the airspeed indicator of
the New Standard, and is the one that looks to me like an AoA indicator
marked as airspeed. IMHO, it would have worked quite well for the purpose
intended in those days (when no controller ever requested you to "say
airspeed"); but would not have been an especially accurate measure of AoA
due to the interference of the wings. In short, lousy for verifying
engineering specs, and better than a more accurate instrument for just
keeping pilots and passengers healthy and airplanes intact.

Peter