Props screwthread

RemcoNL · May 20, 2015

Hi all,

Today I wanted to unscrew one of my CF props, but it keeps turning and turning, maybe the screwthead is more or less ''dead''.

Anybody suggest what to do?

Thanks!! Remco

gray52 · May 20, 2015

The nut is turning in the prop. What ever you do don't mess the motor shaft up removing the prop.

RemcoNL · May 20, 2015

Pffeeeewww, I managed to more or less demontage the CF prop - took the head off and then I could srew it yently - thank you gray52! -
That was my adventure with the CF screw prop -> I put the quick release set back on again.....

gray52 · May 21, 2015

So these were not Dji props then?

RemcoNL · May 21, 2015

Well, I ordered them at Toemen in the Netherlands:

http://www.toemen.nl/dji-inspire-carbon-propellers-cw-ccw-op-voorraad-p-21137.html

Especially for the Inspire, but I'm disappointed and will call them anyway and sent the props back I guess, I think the solution of Tger CF props could be better but I take a break for this moment about the props as a beginner........ ;-)

Frank508 · May 21, 2015

I'm running something that look like that:
http://www.ebay.com/itm/281662076090?_trksid=p2060353.m2749.l2649&ssPageName=STRK:MEBIDX:IT

I find them to be a lot quieter that the DJI props. My inspire came with the quick releases, but comments on this forum got me to thinking about their reliability, so I switched to the original DJI, and then moved to these. The aluminum hub appears to be press fitted into the composite prop and that is certainly their weak point, but I think the DJI screw-ons have a similar construction.

It is all a trade off - I feel more comfortable with the after-market props. But I can certainly see a good argument for each of the other options.

RemcoNL · May 21, 2015

Hi Frank508, yes I think I got the same ones and indeed the alu hub appears to be press fitted, When I finally inspected the other one, it results that the hub was tightened after all and I could took it off, the alu screw construction underneath it was well backed to the composite CF, but when I inspected the other prop on the machine it seemed that the alu screw construction was not tightened to the CF props, it was turnable from the CF prop; so I could turn it of the motor screw (sorry for my english)

Frank508 · May 21, 2015

I don't have any of the DJI screw-on props to look at, but I imagine that they have the same pressed in hub, and that is certainly a weak spot.

The other problem with the screw-ons is if you set you motor breaking too high, you can spin them off, especially with these carbon props that seem to have a lot more mass. I've turned my braking to the lowest setting, and then I am very careful when fitting the press fit hubs to the motors. It would be easy to over torque them and weaken the press fit bond, leading to the issue you had. (I'm not saying you did that, a prop strike, or a manufacturing defect would do it too.)

Your English is great BTW.

The Editor · May 21, 2015

Frank508 said:
The other problem with the screw-ons is if you set you motor breaking too high, you can spin them off

Well not with prop locks they won't!
Original threaded props with locks offer redundancy so are are a much better option.

Frank508 · May 21, 2015

The Editor said:
Well not with prop locks they won't!

I agree. The prop locks and the spin-on blades seem safer to me.

I've stocked up on what I believe will be a lifetime supply of spin-on blades and prop locks while they are cheap and plentiful.

Speaking of props, we spend a lot of time in the plane of the prop disk. I hope everybody replaces any prop that comes into contact with anything under power. A thrown blade can do a lot more than crash your Inspire.

Props screwthread

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