I’ve been having a lot of trouble with airspeed and AoA measurement on my new-to-me RV-10. After a day of hard landings where I just could not get a good flare before hitting the tarmac, we decided to recalibrate the airspeed to the GPS, flying with and against the wind. After doing this, we noted that the AFS 5600 with dual Dynon ADAHRS required an adjustment of -9 KTS on each ADAHRS in order to get the calculated true airspeed and GPS speed to agree (the plane was flying slower than the instruments were suggesting).
Interestingly, the G5 that is on the same pitot static system needed a -6 KTS adjustment as well, although I can’t figure out how to do this. Garmin manuals say it is factory calibrated and never wrong.
I lived with this for awhile but later noticed as I accelerated down the runway I also saw a rise in altitude (500 fpm). This led me to believe that airflow was creating a pressure decrease on the static side, which would explain the climb rate and airspeed inaccuracies.
Today in order to find the static system “leak” I separated the static system into two halves. One Adahrs was connected to the right static port. The other adhrs and the G5 were connected to the left static port. I set up each screen to read a different ADAHRS. I then flew some patterns in the air and found that no adjustment was needed from the -9kts that was already in the system for each Adahrs.
So now I sit dumbfounded. I have a pitot static test/cert coming up in a week or two, but would like to understand the issue first if possible.
-any other ideas as to what might be going on?
-anybody know of a way to calibrate the g5 airspeed indication?
Interestingly, the G5 that is on the same pitot static system needed a -6 KTS adjustment as well, although I can’t figure out how to do this. Garmin manuals say it is factory calibrated and never wrong.
I lived with this for awhile but later noticed as I accelerated down the runway I also saw a rise in altitude (500 fpm). This led me to believe that airflow was creating a pressure decrease on the static side, which would explain the climb rate and airspeed inaccuracies.
Today in order to find the static system “leak” I separated the static system into two halves. One Adahrs was connected to the right static port. The other adhrs and the G5 were connected to the left static port. I set up each screen to read a different ADAHRS. I then flew some patterns in the air and found that no adjustment was needed from the -9kts that was already in the system for each Adahrs.
So now I sit dumbfounded. I have a pitot static test/cert coming up in a week or two, but would like to understand the issue first if possible.
-any other ideas as to what might be going on?
-anybody know of a way to calibrate the g5 airspeed indication?
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