Drill and file some slots behind the spinner in the fuselage front, then drill 2 or 3 7/64 or 3/32 holes in the spinner front, one between each prop blade. (Doesn't matter if your using a 2 or 3 bladed prop. If your using a 2 blader , drill 2 holes, a 3 blader, then drill 3 holes.) Air will flow through those holes into the fuselage via the 1st mentioned slots, as the model moves forward.

You will need to also cut a warm air exit slot up on the underside of the fuselage, up near the tail somewhere. About 1 inch x 1/8th or so, to create the air flow through the fuselage. If you don't, the interior will just pressure up, the motor /esc will NOT cool and then things like battery hatches start popping off.

Alternatively, consider a Brushless Outrunner motor. They run a lot cooler. Also, you've posted your message in the Ducted Fan (Jet) section.