OK, I am bored today so I did a small experiment on my Mini. I have noticed for some time that when hovering in a windless environment, the revolution speed of the motors at the back is significantly higher than those of the front motors. This is not good because it means the motors at the back will reach their speed limit sooner so the overall power of the craft is reduced.
I have been suspecting that the higher revolution speed is caused by the pitch of the props reduced for some reasons. To verify this I swapped the front props with those at the back and checked the motor speeds when hovering indoor.
Original prop installation :
Props swapped :
So what I have suspected turns out to be true ! The props at the back have lower pitch and after they are installed on the front motors, the revolution speed of the front motors becomes higher !
My Mini is very new, less than 10 flights. No crash or hard landing.
This opens up further questions :
1) How is the pitch of the props at the back changed ? can it be due to the fact that they are being sit on by the craft when stored inside the case that came with the drone ?
2) Does this explain the numerous reported crash cases of Minis in which some motors have the power maxed out and the craft failed to tilt to the commanded angle before it fell out of the sky ?
3) How can the problem be solved ? Are there any better props out there ? Hope third-party prop makers are listening.
Any comments ?
I have been suspecting that the higher revolution speed is caused by the pitch of the props reduced for some reasons. To verify this I swapped the front props with those at the back and checked the motor speeds when hovering indoor.
Original prop installation :
Props swapped :
So what I have suspected turns out to be true ! The props at the back have lower pitch and after they are installed on the front motors, the revolution speed of the front motors becomes higher !
My Mini is very new, less than 10 flights. No crash or hard landing.
This opens up further questions :
1) How is the pitch of the props at the back changed ? can it be due to the fact that they are being sit on by the craft when stored inside the case that came with the drone ?
2) Does this explain the numerous reported crash cases of Minis in which some motors have the power maxed out and the craft failed to tilt to the commanded angle before it fell out of the sky ?
3) How can the problem be solved ? Are there any better props out there ? Hope third-party prop makers are listening.
Any comments ?
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