Style 2: On a second prototype we simply enlarged the hole
in the front of the cowling, where the motor shaft comes through,
to 1-1/4" diameter. This is slightly larger than the motor spinner
and will let in sufficient air to cool the power system.
❑
39) Once the air gets inside the cowling it needs somewhere
to exit. Take a close look at the balsa battery hatch and you will
see that it has 3 holes already cut in it, but the holes are covered
over with white covering material. Take a sharp hobby knife to cut
away the covering over the holes. This will complete the cooling
air path. The air can now flow into the cowling, through the open-
ing in the lower front of the fuselage under the cowl, and then exit
through three holes in the battery hatch, keeping a steady flow of
cooling air over the entire power system.
MOUNTING THE PROPELLER & SPINNER
❑
40) Locate the Propeller with Brass Hex Nut and Aluminum
Sleeve, plus the rubber Spinner from the kit contents.
a) Remove the front M3 lock nut and the washer from the
motor shaft. Then thread the Brass Hex Nut that came with the
propeller onto the motor shaft. Thread it all the way back, up tight
against the rear lock nut. Tighten it securely. (If you have some
Locktite® thread locking compound, put a drop between the two
nuts before you tighten them together.)
b) A short section of aluminum tubing is provided with the pro-
peller to sleeve down the hole in the prop hub to the same diam-
eter as the prop shaft. Press the aluminum sleeve into the center
hole of the prop, as shown. It's a tight fit, but it will go in.
c) Next slide the propeller in place onto the motor shaft. Notice
that the backside of the propeller hub has a hex shaped recess
the same size as the brass hex nut. Slide the propeller all the way
back, pressing it over the brass nut.
d) Place the flat metal washer back on the motor shaft, and
then thread the front lock nut in place against the washer and the
propeller. Tighten the nut securely.
SAFETY WARNING: With the propeller mounted to the motor, it
is very important that you always be aware of the position of the
throttle stick on your transmitter whenever you plug the battery
pack onto the system, making the system "hot". The motor used
in this model is powerful enough to cause damage to people or
property if it is activated prematurely, accidentally, or unexpect-
edly. With an electric airplane, we recommend that you get in the
habit of always keeping the throttle stick in the "low throttle" posi-
13