Bill_H
I love flying!
Having installed the D-1000 in my RV-12, I am testing my pitot and static system. I know the ADAHRS is working for pitch because I can push down on the back of the plane and see the pitch change. Now, when I slightly pressurize the pitot to get an airspeed indication (this is a pitot tube in the nose, not the dynon wing pitot), in order to check the pitot leakdown rate, I get large PITCH indication changes as well. If I pressurize (using a hypo syringe) very quickly the pitch down indication is very pronounced, then some significant vertical excursions and wobbling as well until it steadies out. Obviously, the plane is stationary!
Is this normal?
I have confirmed that the pitot leakdown rate (once stable - involving getting the pitot under pressure then quickly covering it with my finger!) is miniscule (one knot per minute).
When I pull a slight vacuum on the static, the same pitch thing happens, but I think that is related to the airspeed phenomena - obviously lowering the static makes the D-1000 think it has airspeed.
ALSO:
I am having trouble testing the static leak rate. Using a hypo, tubing, and "goop" around the static port still "seems" to have a leak that makes the altitude go down quickly. (or it could be a leak somewhere else.) So to test that I taped over both static ports, which tee together and then go to the ADAHRS. I disconnected the leg to the ADAHRS and blew into it - no flow resulted - confirming that both tubing branches to the static ports had no leaks under pressure. I am pretty confident about the tubing connection to the ADAHRS - it seems just like the pitot one, installed the same. But is there perhaps some sort of internal orifice in the ADAHRS on the static side that vents it down? I find no provision for a static check method in the Skyview installation manual.
I wanted advice before I try this, but I could connect the line to the ADAHARS, disconnect the other end of that line from the static port tee, and either blow or suck on it to verify that connection on the ADAHRS itself has no leaks - even do a bubble test.
Comments?
Is this normal?
I have confirmed that the pitot leakdown rate (once stable - involving getting the pitot under pressure then quickly covering it with my finger!) is miniscule (one knot per minute).
When I pull a slight vacuum on the static, the same pitch thing happens, but I think that is related to the airspeed phenomena - obviously lowering the static makes the D-1000 think it has airspeed.
ALSO:
I am having trouble testing the static leak rate. Using a hypo, tubing, and "goop" around the static port still "seems" to have a leak that makes the altitude go down quickly. (or it could be a leak somewhere else.) So to test that I taped over both static ports, which tee together and then go to the ADAHRS. I disconnected the leg to the ADAHRS and blew into it - no flow resulted - confirming that both tubing branches to the static ports had no leaks under pressure. I am pretty confident about the tubing connection to the ADAHRS - it seems just like the pitot one, installed the same. But is there perhaps some sort of internal orifice in the ADAHRS on the static side that vents it down? I find no provision for a static check method in the Skyview installation manual.
I wanted advice before I try this, but I could connect the line to the ADAHARS, disconnect the other end of that line from the static port tee, and either blow or suck on it to verify that connection on the ADAHRS itself has no leaks - even do a bubble test.
Comments?