carl.froehlich(at)verizon
Guest
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 Posted: Tue Dec 27, 2011 8:04 am Post subject: RV-List: Dynon Skyview Airspeed Calibration... |
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A few of thoughts.
1. It is an easy set up to verify IAS reads properly. Attached photos are
the rig I used. I also attached the scale to translate inches to knots.
There are various placed to find the test rig on the web. You need not take
the airspeed indicator out of the plane, just attached the tube to the pitot
and seal with electrical tape. In the attached rig photo, the pressure
source attaches to the tube that is hanging free on the left. I found an
old blood pressure bulb for this.
2. For my 8A, I initially used a pitot tube that included the static port.
It word well except for high pitch angles. At high angles the static port
started to get ram air. The result was I could have "0" IAS in power on
stalls but still be flying.
3. When I took the plane down for paint, I installed two of the Cleveland
tool static ports in the standard fuselage locations. These are flush
ports. I found this induced a static error. I did a simple fix by drilling
a 1/16 inch hole in the center of a 3/16 round head rivet, cut the rivet
head off and then epoxied the rivet head over the static port. I used a
toothpick to hold the rivet head in place while the epoxy set, and to keep
the epoxy out the hole. This fix solved the static problem. Photo
attached.
4. On the RV-10, I used the same rivet but did not use the Cleveland ports.
I drilled the 1/16" hole all the way thought the head and rivet shank. I
epoxied the rivet to the fuselage, adding a 1/8" thick, 1/2" diameter
aluminum ring (3/16 hole drilled in the middle) backer to the inside of the
fuselage to add strength. The static line then gets epoxied over the rivet
shank.
Once you verify the IAS is correct, but you still have a problem with TAS
reading high, recommend you talk a look at where you mounted the Dynon OAT
probe. If you have it in a place that is typically hotter than outside or
getting a lot of prop wash (increases temperature), TAS will read high.
Carl
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