..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