Just installed SV32s/D100 in my original homebuilt. After config, the pitch servo and, to a lesser degree also the roll servo, jitter almost continuously while holding ALT and HDG on the ground, and the pitch servo continues to do so in the air regardless of sensitivity and Q. This happens static both on the ground and in trim in the air, with the yellow UP trim indication appearing soon after AP selected ON. Trimming up tail heavy in cruise makes the Yellow msg disappear.
The pitch servo is mated via generic install kit to a 2-ft long intermediate push-pull elevator tube which moves a bellcrank to which are attached the elevator actuating cables. I have stick actuated controls. The roll servo is likewise linked to the actuating arm of the aileron torque tube running outboard from the center section.
In flight, the jitters are always present while the AP correctly controls the plane. The instances of jitters are every 2 seconds to half a second in pitch and more intermittently in roll. No free play in the ailerons and only cable slack for the elevator, and control stick inertia at the other end. I also detect occasionnal roll servo jitters in flight.
Also, the AP only tracks the actual course made good of the 296 GPS at the time of TRK engagement, but does not keep the lateral track bar centered. Of course, it doesn't intercept either and won't turn over a turning point enroute. GPS settings are AVIATION IN/NMEA AND VHF OUT Normal 9600 baud rate. Yes, I get the loss of GPS tracking info to the HSI and reversion to the HDG mode.
Any fixes?
Michel
The pitch servo is mated via generic install kit to a 2-ft long intermediate push-pull elevator tube which moves a bellcrank to which are attached the elevator actuating cables. I have stick actuated controls. The roll servo is likewise linked to the actuating arm of the aileron torque tube running outboard from the center section.
In flight, the jitters are always present while the AP correctly controls the plane. The instances of jitters are every 2 seconds to half a second in pitch and more intermittently in roll. No free play in the ailerons and only cable slack for the elevator, and control stick inertia at the other end. I also detect occasionnal roll servo jitters in flight.
Also, the AP only tracks the actual course made good of the 296 GPS at the time of TRK engagement, but does not keep the lateral track bar centered. Of course, it doesn't intercept either and won't turn over a turning point enroute. GPS settings are AVIATION IN/NMEA AND VHF OUT Normal 9600 baud rate. Yes, I get the loss of GPS tracking info to the HSI and reversion to the HDG mode.
Any fixes?
Michel