need help picking out prop adapter!
 

my prop adapter on my brushless plane broke.
i know that there are brushless plane motors with different sized shafts.
how do i pick a prop adapter that will fit my motor?
when i looked on ebay, there were some 3mm, 5mm ect. but i didnt know if that was the size of the shaft that it fits on, or the size of the shaft that the prop goes on?

RE: need help picking out prop adapter!
 

Well first you need to know the motor shaft diameter. For the most part unless you're running a BIG motor the adapters are pretty much the same size on the prop end.
To be sure just measure your prop holes. Then you'll know exactly which adapter you need.

If you don't have a metric ruler, use a drill guide to match the shaft diameter then convert it to metric by using a conversion table from fractions to mm.