Zbip57
lvl.4
Canada
Offline
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hallmark007 Posted at 6-23 10:26
Don’t get bogged down in having tips of props curled up, the reason for this on dji props is a noise design, a lot of dji craft have this but many dji craft fly with perfectly straight props and the difference is noise. Mavic pro, P4pro , Mavic air, inspire, Matrice etc so the curl may effect noise but that it, if the curl was essential we would see many problems with aforementioned drones.
You could change rear props but I’m certain in two weeks time doing same hover test you will get similar results, so it’s my opinion if your props look ok and show no physical damage then the props are ok.
Hallmark007 writes. "I think those above should give clear information when recommending changing props, that curl is designed to combat noise."
And once again he recommends, "if your props look ok and show no physical damage then the props are ok."
If your props have triggered a Motor Speed Error warning, then they certainly are not ok, even if they "look ok". Do your own hover test, and you'll know for sure.
The problem stems from how the axis of the rear motors is at an angle canted outwards. When the arms are folded back and the props are crossed across the Mini's body for storage, the rear propeller blades are forced to bend. It is not merely the curled tip that gets bent. It's the entire prop blade that is being stressed.
Check these photos. You can see how the rear motors are canted outboard. It doesn't make any difference whether the props have curled tips, or whether the props lie in a perfectly straight line with no curl. The issue is that new prop blades cross and cannot be nested together unless one side or the other is bent down to fit under the other side.
In the third photo, one of the new left-rear blades (#1) is still standing free, whereas the other blade (#2) is just starting to bend as it is being forced to nest under the right-rear blades. It is obvious from this photo how much stress is being applied to bend that blade (#2). If it remains stored in that bent position for any length of time, it will be permanently deflected to retain that bent shape. In that condition (even if it looks ok to you), the shape of the bent propeller is less effective at generating lift and the motor has to run faster to compensate.
The front propeller blades are less susceptible to being deformed like this because the front motor axis is not canted the same way as the rear motors. When the front blades are stored crossed over the body, they slide more easily together without being bent.
If you've always stored your rear props crossed like this, and they slide easily to nest over/under each other, it's very likely they've already been permanently deformed. Do the hover test, and you'll find out for certain.
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Motors canted outboard
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Rear-right blades.
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Rear blades crossed.
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Front motors not canted outwards.
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Front right.
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Front blades folded.
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