Extreme Flight 78" EXTRA 300 ARF Instruction Manual page 21

22. Next let's install the motor/engine. We have made this process very easy. The center
and offset marks have been scribed into the front of the firewall with a laser. Holes have
also been marked which correspond with the mounting holes for the cage mount used with
our recommended Torque outrunner. If using our recommended motor set-up and cage
mount simply drill the mounting holes at the designated location and bolt the
motor/mount assembly in place. If using a different motor or mount use the marks on the
firewall to determine proper motor position. Be sure to use the offset line to the right of
the vertical center line to accommodate for the motor offset due to the built in right thrust
angle in the motor box. Distance from the front face of the motor box to the motor drive
washer is 5 1/8". I highly recommend mounting the ESC on the bottom of the motor box
which will place it directly in the path of the airflow entering the opening in the cowl just
below the spinner.
21