Attitude and Airspeed

[lhaviation]

I just calibrate the Airspeed probe on my D10.

But when the speed changes, the pitch attitude change, although the EFIS don't move.

Is it an known problem? Can I do something?

Thank you

Joseph

 

[khorton]

This is completely normal for Dynon EFIS.

If you have a mechanical gyro, and you accelerate, the gyro responds to the acceleration, and shows an error in pitch during the acceleration.  The solid state "gyro" systems used by Dynon would be similarly affected.  But, to reduce the effect of acceleration on the attitude calculation, Dynon also uses the airspeed info.  If the airspeed increases, the system knows that there must be an acceleration, which would be affecting pitch attitude calculation, so it applies a correction.  This works very well in the aircraft (unless your pitot tube ices over), but it gives strange results if you apply pressure to the pitot input when the unit is actually not moving.