ADAHRS serial data out

[amolny]

Yesterday I had a momentary loss of power during descent. I had 10gal in the left wing (33gal capacity) and the power loss occurred 2 minutes into the descent. Lancairs are prone to unporting the fuel pickup during uncoordinated flight. If I was yawed to the left (which typically happens in a dive) this would make sense. I'm streaming the serial data to a laptop for post-flight analysis. The data clearly shows a lateral acceleration, but the 'lateral g's sign' is negative. This doesn't jibe with my other information.

Is it possible there's a typo in the Appendix E of the installation manual? Should a '-' sign mean acceleration to the left?

Thanks,
Adam Molny
Lancair Legacy N181AM

 

[dynonsupport]

Looking into the answer. Agree that the documentation could be better. To clear up confusion, the answer will be in the form of, "When lateral G sign is positive, the ball is deflected to the ______".

 

[dynonsupport]

OK. so '+' means ball to the right, '-' means ball to the left. That means that the manual is right. If you gave the aircraft a push from the right side, accelerating it "leftward" laterally, you'd get a + indication.

In your case, since it's negative (ball left), that means that either the aircraft was accelerating to the right, or if it were not accelerating, but in a non-coordinated steady state, was rolled left (again, ball left).

 

[amolny]

Excellent, thanks for clearing that up! Since this was a safety of flight issue I wanted to make sure all the data was corroborated.
-Adam Molny