E-flite P-38/F-5E Lightning 400 ARF - Manual (Page 25)

5 E-flite P-38/F-5E Lightning Assembly Manual
  7. Remove the backing from the double-sided tape on
the sides of the boom. Slide the cowling onto the boom,
pressing it against the tape once you have confirmed
proper alignment.
Note: Never check the motor rotation on the bench
with the propeller installed. The plane could move and
cause serious injury. Always check the motor without the
propeller to avoid injury.
Important Information About Your Propeller
It is very important to check to be sure the propeller is
balanced before installing onto the shaft. An unbalanced
propeller may strip the gears or cause poor flight
characteristics.
  8. Install the propeller and spinner backplate as shown
on the prop shaft of the gearbox. The spinner backplate
will actually be installed in front of the propeller.
Note: Pay close attention to the orientation of the
propellers as shown in the photos.