When I built my panel back in 2007/8 with the Dynon D100/D120 system I decided to add a backup ASI and Altimeter but rarely looked at them as I was comfortable with the glass. As a part of getting my instrument rating recently I had the IFR pitot static checks done which included my backup steam gauge altimeter and everything checked out fine.
During the partial panel element of the rating I decided to cross check the backup ASI against the EFIS display and noticed that my steam gauge ASI is consistently reading about 10 MPH higher than the EFIS indicated airspeed. All of the stall AoA tests were done with the EFIS and generally were very close to the vans published numbers so I believe the EFIS is correct. Is there a way to cross check the numbers and calibrate the steam gauge ASI?
Figs
During the partial panel element of the rating I decided to cross check the backup ASI against the EFIS display and noticed that my steam gauge ASI is consistently reading about 10 MPH higher than the EFIS indicated airspeed. All of the stall AoA tests were done with the EFIS and generally were very close to the vans published numbers so I believe the EFIS is correct. Is there a way to cross check the numbers and calibrate the steam gauge ASI?
Figs