After finally getting every piece on my plane to work, another piece decided to be a problem. Great.

My problem is pretty much already summed up in the title, my prop keeps flying off my motor, and I want to stop it from doing that because no prop pretty much means you crash.

Here is a picture of the motor pod and prop unattached from each other.

motor pod and prop

Here is a picture of the prop hardware that goes over the motor.

prop hardware

Sorry if the pics aren't working, I don't use them a lot and haven't quite figured out the syntax and stuff. Any suggestions on how to keep the prop on during flight?

  • $\begingroup$ Hrm. That looks like a friction fit, right? $\endgroup$
    – ifconfig
    Commented Dec 22, 2020 at 18:49
  • $\begingroup$ @ifconfig, I think so, there's no nuts or anything that came with it. Well, the prop and the spinner screw together on the front piece but connecting to the motor yes it is friction fit. $\endgroup$ Commented Dec 22, 2020 at 19:01
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    $\begingroup$ At first thought, you might be able to try Loctite... I think scuffing up both surfaces would help with that method, but I'm not sure if this would cause other problems. $\endgroup$
    – ifconfig
    Commented Dec 22, 2020 at 19:16

2 Answers 2


It looks like you are missing a piece of the prop adapter.

There should be three pieces, the nut, the central shaft with a thread for the nut on one end and a taper on the other, and a collar that matches the taper. You're missing the collar.

The nut forces the collar onto the taper, which squeezes the slots together, gripping the shaft. They're normally very secure but won't work without all three parts.

Here's a picture (I get an error when I try to embed it) or you could just look for pictures of 'collet prop adapter'.


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    $\begingroup$ OH! that thing! I actually have it, I just thought it was a spacer thing and haven't been using it since the prop was pretty fat. Thanks! $\endgroup$ Commented Dec 23, 2020 at 13:16

Robin Bennett has the right answer, but if or whatever reason your collar doesn't fit on the shaft with your prop and nut, you can counter-sink the back of the prop and it will squeeze the shaft tight.


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