N707RW
Active Member
Hello,
I have a recently installed Dynon AP in an RV-7A. I am driving it with an Apollo GX-60 GPS over the serial RS-232 port. I am getting severe S-turning back and forth across selected nav courses. On the first couple of test flights, the s-turns happened each time I selected nav. Yesterday the air was very smooth and it happened on the fourth time I selected a nav course.
I know that there may be compatibility issues with the Apollo GPSs, but I believe that my GPS is outputting all the required data, as evidenced by the three successful GPS tracks. They are in the datalog (attached) at 012639-012831, 013524-013706, and 013812-013939.
In the datalog at 014222-014754 there is a good example of the s-turns. Initially the GPS was given a direct-to a point. Nav was engaged. The airplane turned from 346 to approx 300 heading and held that well until 014459 when another GPS track was selected (actually a GPS approach was loaded). Nav was not disengaged. The airplane turned to 045, then left to 300, then right to 045, then left to 304. At 014754 nav was disengaged because the s-turns were not stopping. The s-turns seem to go to a 45 degree angle and then reverse direction.
In bumpy air the problem is much worse. Sensitivity has been varied from a high of 15 to a low of 5 with better results at 5. Torque is set to 100% and there are no apparent roll slips.
The autopilot was installed with the help of beta tester Rich Wilson and he is submitting this report for me.
Thanks,
Paul Pajak
I have a recently installed Dynon AP in an RV-7A. I am driving it with an Apollo GX-60 GPS over the serial RS-232 port. I am getting severe S-turning back and forth across selected nav courses. On the first couple of test flights, the s-turns happened each time I selected nav. Yesterday the air was very smooth and it happened on the fourth time I selected a nav course.
I know that there may be compatibility issues with the Apollo GPSs, but I believe that my GPS is outputting all the required data, as evidenced by the three successful GPS tracks. They are in the datalog (attached) at 012639-012831, 013524-013706, and 013812-013939.
In the datalog at 014222-014754 there is a good example of the s-turns. Initially the GPS was given a direct-to a point. Nav was engaged. The airplane turned from 346 to approx 300 heading and held that well until 014459 when another GPS track was selected (actually a GPS approach was loaded). Nav was not disengaged. The airplane turned to 045, then left to 300, then right to 045, then left to 304. At 014754 nav was disengaged because the s-turns were not stopping. The s-turns seem to go to a 45 degree angle and then reverse direction.
In bumpy air the problem is much worse. Sensitivity has been varied from a high of 15 to a low of 5 with better results at 5. Torque is set to 100% and there are no apparent roll slips.
The autopilot was installed with the help of beta tester Rich Wilson and he is submitting this report for me.
Thanks,
Paul Pajak