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Southwest
02-20-2022, 06:26 PM
I was flying yesterday after a nice cold front hit with all its associated winds. I was cruising at 1,000 feet and noticed my TAS was 75 but GS was 130! The Dynon Skyview showed an almost direct tailwind at 55. My hand held GPS verified the GS as 130. I did a 180 at the same altitude. Still 75 TAS but the GS was now 117 with the Skyview again showing a direct tailwind. Today I check my pitot and static lines. The rubber was so brittle the tubing kept snapping apart at 6" intervals.

So I have learned to replace those lines at the 5 year point (just as I do with the rubber parts on my Rotax). And I am guessing the Dynon software is programmed to look at TAS, get GS from the onboard GPS and using math and geometry arrive at a wind component and velocity. Just my two cents. Be safe.

Delta Whisky
02-23-2022, 06:55 PM
Southwest - I've had really good luck running quality plastic lines for the pitot static system but using medical grade silicon tubing for all connections. I've used this combination for over 30 years and never a fault, never replaced even one.

Also, since you brought up the subject, I just can't restrain myself from posting my best ground speed in a Kitfox. (Well, it wasn't my best ever but I do have this photographic evidence of the second best speed (176 knots, 202 mph)).

29920

These are amazing, multi-functional planes.