Which style prop adapter is the best for brushless motors and why collet or grub screw.

Bolt on.

But of your two listed, well each has good points. With the collet you have multiple gripping surfaces around the whole shaft. The set screw only has two or so, the screw and the opposite side of the adapter, or two screws. Leaves the other parts free to move if the hole is not a perfect fit, also if so, you can cock the adapter on the shaft.

If you notch the shaft it makes it nearly impossible for the SS type adapter to come off. If your collet and shaft are not a good fit the collet and prop can launch on you.

Also you need to be sure your prop is trimmed on the back side with a collet adapter in some cases, as the collet can protrude from the collar and the prop won't fully seat, which makes it almost impossible to tighten the prop.

For me the bolt on is number 1. Then the collet type the last and only if that is all I can find is the slip on with set screws. I have never had a set screw adapter not wobble a little on the shaft. I have launched a few collet ones. I roughen up the shaft to give the collet something to grab when it tightens down.


Buzz.