If you think about it, if you were to build a quad from scratch w/no automation it would be important for all four motors/props to rotate at the same RPM & have identical & counter-rotating props. As RPM dips in any given motor you begin to lose lift on that corner, if it dips enough or too suddenly the aircraft flips.
I'm not sure if the PV uses motors w/built-in tach's (looks like it has enough wires, anyone?) but w/closed-loop feedback motor speed control combined with inertial mass sensors to detect XYZ movement & velocity, automation must monitor all the sensor & tach inputs to calculate corrections to the motor drives to maintain the aircraft stable. But if say there's a bad bearing that suddenly starts to bind then become free all in an instant, I wonder if the firmware would overreact which would result in a series of oscillations (too fast/too slow) which would look like a wobble? Another I dunno here, just thinking out loud trying to make sense of all these "dropped out of the sky unstable" reports.
Perhaps some of you who have experience flying Phantom-1's or similar aircraft can comment.
iDrone
I'm not sure if the PV uses motors w/built-in tach's (looks like it has enough wires, anyone?) but w/closed-loop feedback motor speed control combined with inertial mass sensors to detect XYZ movement & velocity, automation must monitor all the sensor & tach inputs to calculate corrections to the motor drives to maintain the aircraft stable. But if say there's a bad bearing that suddenly starts to bind then become free all in an instant, I wonder if the firmware would overreact which would result in a series of oscillations (too fast/too slow) which would look like a wobble? Another I dunno here, just thinking out loud trying to make sense of all these "dropped out of the sky unstable" reports.
Perhaps some of you who have experience flying Phantom-1's or similar aircraft can comment.
iDrone