obiwan_pierogi said:The way I see it, the compass just tells the brains, the direction it is pointed.. Rotating the compass shouldn't really screw up anything, other then deciding which direction is front.. I am extremely careful when I calibrate to make sure the compass is parallel to the Earth.. So with my compass rotated, when I do the second part of the calibration, by turning the copter on edge, I position is so one leg is slightly dipped down (to keep the compass in the same position, in relation to the ground, if it was attached in the factory set position) .. I know my fellow copter flyer is plagued with the major left hook, after a straight run, but he doesn't experience the TBE.. My toilet bowl effect, was upwards of 70 feet..
You're missing the point. No matter how you calibrate the compass, the FC is making incorrect calculations based on the fact your compass is off axis by 30 degrees. So, you've substituted one set of inaccurate calculations for another.
obiwan_pierogi said:One thing I have noticed, is that if I do a straight run, then let go of the toggle, the copter will keep going straight ahead for a period of time.. This is fine, if there's no swing, one way or the other, but becomes very noticeable, when you're behind the copter and instead of carrying on straight, it makes a dramatic left or right hook, depending on declination.. Maybe there's something in their programing, that momentarily shuts the compass off, when you let go of the toggle.. Otherwise, wouldn't the craft naturally arc left, as you were flying in a straight line? I was thinking maybe precession plays a part, but counter rotating props should null that aspect.. However, I'm not sure if the craft may have a built in gyroscope, which could be sending the wrong message, because of precession.. I just don't know enough about how the electronics function on this craft, other than what I can observe for myself
Nothing shuts the compass off, ever. The FC would have no way to know which way to go. In GPS mode, the FC is pretty much always going somewhere even when you're not moving the sticks. And it has both a 6DOF gyroscope and a 3 axis accelerometer. And gyroscopic precession has no bearing on this issue otherwise everyone would see it evenly which is not the case. This issue is very simply a declination calculation error. I have seen it in the data. Let's stop second guessing it. We pretty much have the smoking gun. The guilty party is identified and it is up to DJI to put them in a corrective facility.
And on that note... For everyone reading and posting in this thread: If you want to continue the debate on rotating the compass you are welcome to do so in another thread. This thread is focused on getting a solution to the declination issue. This thread is not the place to discuss "it kind of works" jerry rigged kludges that compromise the integrity of the sensor and the FC algorithms. DJI themselves have said the Phantom compass is not meant to be rotated. I said that in my first post. I've obliged the debate but I now want the focus to return to the specifics of getting DJI to fix this issue in the only way it can truly be fixed.