Its my first time posting in this forum and hope someone can help.
I have been flying a similar waypoint at 5m/s successfully numerous times however the first time i increased the waypoint speed to 8 m/s it crashed on route to the 3rd waypoint.
Have had a look at the logs but cannot understand why the copter increased throttle to 1.0 all of a sudden.
In mission planner select Mechanical Failure and go to 20233 in the log. You will see that Desired and Actual diverge. If you graph the RCOUT you will see the motors going in opposite direction.