E-flite Brio 10 ARF - Manual (Page 39)

Note: Steps 4 through 6 cover the installation
of the propeller when using an Outrunner motor.
Skip to Step 7 for the installation of
the propeller when using an Inrunner motor
and gearbox.
 4. If using an Outrunner motor, it may be necessary
to ream a larger opening into the backplate of
your E-flite
™ spinner to fit the shaft size of the
prop adapter shaft. Slide the aluminum prop
adapter shaft and collet onto the motor to check
the size of the hole in the propeller.
39