Zbip57
lvl.4
Canada
Offline
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m80116 Posted at 6-19 14:52
What I can tell you Zbip57 and I was noticing the other day, I always end up with my rear left motor blades being on top of the right as they slide easily on top of the other pair (but not vice versa) and are not squashed.
I've wondered how, why... but haven't thought about it, in the meantime I've always folded the props that way. Also to be noticed, when I disassembled the props for inspection a month ago (comparison pictures in this forum) they are absolutely profiled liked a brand new sealed blades set in a rigid cardboard box, and I know those are perfect. Thus I can conclude my way of storing the Mini hasn't changed the blades' profile.
"[...] Thus I can conclude my way of storing the Mini hasn't changed the blades' profile."
I've flown my Mini since December, and travelled with it always stored in the Fly More case, and never had a problem. I certainly never had the dreaded Uncommanded Descent. Sure, I saw the occasional "Max Power" warnings but ignored them like everyone else. But I received the Motor Speed Error warning on my first flight after upgrading to firmware v01.00.0500.
Unlike some people on here who immediately dismiss such nuisance warnings as defective firmware, I wondered whether DJI had a good reason to introduce this new warning feature. I read what people were saying on this and other forums and found out that it's possible to analyze your own flight log data and run a simple hover test to see for yourself whether your motors are running at too fast speeds. Sure enough, the data showed my left-rear motor hit 16,000 rpm during the flight that triggered the Motor Speed Error warning, which warning specifically recommended changing the propeller blades on that motor.
There was nothing visibly wrong with any of the blades. Even holding the new blades next to the old blades, I didn't see any obvious difference. But, after replacing the original blades with fresh new blades, the hover tests conclusively demonstrated a reduction in motor speed with new blades installed. Furthermore, with the new blades installed there is an immediately noticeable difference in that tips of the fresh blades now cross, whereas the old blades slid easily to nest together when folded.
Again, here's the photo of the new blades installed on my rear motors. They will not nest together unless one side is depressed to slide under the other side.
People have reported receiving the Motor Speed Error warning on brand new Minis, straight out of the box. Others have reported replacing the prop blades only to receive the same warning again a few flights later. I'm asking, do you store your Mini with the blades folded together? If you've received the Motor Speed Error warning, or even never received the warning, have you ever done the hover test and plotted the motor speeds to confirm for yourself whether the props are running true?
These other four images were posted by someone else. It shows a brand new Mini, straight out of the box. Note, this is not a Fly More case. It's the plastic shipping box, in which non-Fly More Minis are shipped with the arms folded and blades crossed. There is a paper band around the props to ensure they remain seated "properly" within the recessed well so that the weight of the Mini is not resting on the props.
The person who originally posted those photos noticed the gimbal cover was not properly closed and was asking if that's normal. But I noticed instead how deformed the left-rear prop blades are. Compare the last photo to my first photo. In my photo the tips of brand new propeller blades are clearly crossed. In the last photo of the brand new Mini you can see the tips of the blades of the right motor standing proud, whereas the tips of the left motor's blades are bent down forced to tuck under the right-side blades.
This is how brand new Minis are packaged and shipped. Who knows how long the blades of the left-rear motor were stored deflected and bent like this before the box was eventually opened? Do they spring back to stand as high as the right-side blades as soon as the paper band is removed, or are the left-side blades now permanently deformed to easily slide back under the other blades whenever the arms are folded and the blades returned to nest in their storage box or Fly More case?
More importantly, does it even matter if they're permanently deflected? If you're getting a Motor Speed Error warning, I'd say it does matter. People can choose to downgrade to a previous firmware version to avoid seeing the warning again. Or they can ignore the warning believing that it's caused by defective firmware. Or they could do something smart and run a hover test to plot their motor speeds to confirm for themselves whether there is an issue with their propeller blades.
If your left-rear motor is consistently running faster than all the others in a hover test, and your left-rear blades are the ones that are always tucked underneath when the arms are folded (or vice-versa), that would seem to point to a cause and effect correlation...
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Rears Crossed
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Sealed box
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Plastic tray similare to Fly More case
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Paper bands
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Right tips normal, left tips???
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