Radjet 800 prop adapter loose/spinning issue

[thenated0g]

I only have a couple flights on my radjet, no crashes at all. Went out to the field to fly it on 4s and it was making a really weird noise and the propeller would not spin up. Later in the day i was looking at it and realized the prop and adapter were spinning on the shaft. No matter what i did it wouldnt tighten up. No dirt or anything in the grooves to stop it from compressing. I even tried a thicker prop. Anybody have this issue or have suggestions? Really dont want to have to wait for another prop adapter. One club member suggested sanding the prop shaft to roughen it up.

 

[quorneng]

If it is the original prop adapter (and thus hopefully correct size for the motor shaft!) it could have been slipping on the previous flights and has now worn the aluminium away on the collet jaws so they will no longer compress sufficiently to grip the motor.
If this is what has happened the only solution is a new adaptor.

 

[thenated0g]

If it is the original prop adapter (and thus hopefully correct size for the motor shaft!) it could have been slipping on the previous flights and has now worn the aluminium away on the collet jaws so they will no longer compress sufficiently to grip the motor.
If this is what has happened the only solution is a new adaptor.

Man i hope not, i only have like 6 batteries on this.

 

[quorneng]

Although I don't have a Radjet 800 myself however the prop adaptor looks very normal. They are pretty cheap and should be easy to get in the wast coast USA.

 

[Craftydan]

To add to Quoreng's already excellent advice . . .

The only way the adapter can wear out like this is if it's allowed to slip -- friction-fit surfaces only wear when the surfaces are moving relative to each other. If the adapter can slip on the prop shaft, it was never tight enough . . . and "tight enough" is usually tighter than most people realize.

You shouldn't have any premature wearing issues if you get the next one tight enough and use a pusher prop (you don't *have to* use a pusher prop, but the reverse spin of the pusher self-tightens the adapter, where a normal prop can tend to loosen the nut over time and impact).

. . . and DO NOT SAND a collet/shaft joint. EVER. Shimming is ok if done right, but sanding reduces the surface contact area to the high points, which is the worst thing you can do with a collet.