Building an electronic Angle of Attack indicator

RST Engineering - JIm wrote:
The electronics are trivial. The sensors are everything. Please post
detailed information.

Jim



"Rip" wrote in message
...


My pleasure. This topic is timely, since I recently built myself a
"Lift Reserve Indicator" based on the LM3914 and a Honeywell sensor.
Now I'm doing a "true" angle of attack indicator based on the Maxim
4210 multiplier (and an op amp) to correct for airspeed ram pressure.

A terrific treatise on the subject (with one inconsequential math error)
can be found he
http://users.cablemo.net/~jjshultz/sonex/aoa.html

Rip


I used a Honeywell ASDXL05D44D on my initial "lift reserve indicator",
mainly be cause I had a spare kicking around.

The true angle of attack design uses 2 Freescale MPXV7002 sensors.

The sensors really aren't that critical.You're after a repeatable
differential pressure signal, rather than absolute accuracy.

Rip wrote:
RST Engineering - JIm wrote:
The electronics are trivial. The sensors are everything. Please post
detailed information.

Jim



"Rip" wrote in message
...


My pleasure. This topic is timely, since I recently built myself a
"Lift Reserve Indicator" based on the LM3914 and a Honeywell sensor.
Now I'm doing a "true" angle of attack indicator based on the Maxim
4210 multiplier (and an op amp) to correct for airspeed ram pressure.

A terrific treatise on the subject (with one inconsequential math
error) can be found he
http://users.cablemo.net/~jjshultz/sonex/aoa.html

Rip


I used a Honeywell ASDXL05D44D on my initial "lift reserve indicator",
mainly be cause I had a spare kicking around.

The true angle of attack design uses 2 Freescale MPXV7002 sensors.

The sensors really aren't that critical.You're after a repeatable
differential pressure signal, rather than absolute accuracy.


I forget who makes it, but there's a commercially available system
that uses ports in the leading edge of a wing. My primary concern would
be how one protects from fouling while parked. I like your probe idea
since one could easily make a protective sleeve with a "remove before
flight" streamer attached.

Dan, U.S. Air Force, retired

On Sun, 10 May 2009 21:43:15 -0500, Dan wrote:




I forget who makes it, but there's a commercially available system
that uses ports in the leading edge of a wing. My primary concern would
be how one protects from fouling while parked. I like your probe idea
since one could easily make a protective sleeve with a "remove before
flight" streamer attached.

Dan, U.S. Air Force, retired


Any reason not to incorporate the LR sensor ports in a custom main
pitot pylon?

Dan wrote:
Rip wrote:
RST Engineering - JIm wrote:
The electronics are trivial. The sensors are everything. Please
post detailed information.

Jim



"Rip" wrote in message
...


My pleasure. This topic is timely, since I recently built myself a
"Lift Reserve Indicator" based on the LM3914 and a Honeywell sensor.
Now I'm doing a "true" angle of attack indicator based on the Maxim
4210 multiplier (and an op amp) to correct for airspeed ram pressure.

A terrific treatise on the subject (with one inconsequential math
error) can be found he
http://users.cablemo.net/~jjshultz/sonex/aoa.html

Rip


I used a Honeywell ASDXL05D44D on my initial "lift reserve indicator",
mainly be cause I had a spare kicking around.

The true angle of attack design uses 2 Freescale MPXV7002 sensors.

The sensors really aren't that critical.You're after a repeatable
differential pressure signal, rather than absolute accuracy.


I forget who makes it, but there's a commercially available system
that uses ports in the leading edge of a wing. My primary concern would
be how one protects from fouling while parked. I like your probe idea
since one could easily make a protective sleeve with a "remove before
flight" streamer attached.

Dan, U.S. Air Force, retired

Thanks Dan, but credit where it's due. The page I linked to is by Jeff
Shultz, who went through the same exercise I went through, and was kind
enough to make a web-page out of his research.