6
engine cooling in Airplane cowls
• Make sure the exhaust area in the cowl is 3 to 5 times larger than the inlet area. The engine will overheat if
cooling air cannot escape from the cowl.
• If necessary, add air inlet baffles in the cowl.
• Direct the inlet air through the engine cooling fins.
cleaning the Muffler
If you do not clean the muffler on a regular basis, the inside of the muffler will develop significant carbon
build-up. The carbon build-up restricts the exhaust and reduces engine power.
Disassemble the muffler at regular intervals and remove the carbon build-up. Your schedule for cleaning the
muffler depends on the type of oil you choose and how often you run the engine.
Selecting a Propeller
The recommended propeller sizes are shown in the
table provided. Remember that the use of a large
propeller will require care in balancing it. Vibration
will reduce performance and can result in damage
to the engine and airframe.
For break-in, Saito recommends the use of a
smaller propeller for initial break-in and
approximately 20 subsequent flights.
FG-17
FG-21
14 x 8
15 x 6–15 x 10
15 x 6
16 x 6–16 x 8
16 x 6
17 x 6
3 Blade 15 x 7–15 x 9
Engine
Ground
RPM
8,500–
9,200
Engine
Ground
RPM
8,300–
9,000
Diameter x Pitch (inches)
connecting the throttle Linkage
1. Use a ball link to attach the throttle linkage to the
throttle arm on the carburetor.
2. Power on the transmitter and receiver.
3. Move the throttle stick to the middle stick
position.
4. Adjust the throttle arm so the arm is 90 degrees
to the throttle pushrod.
5. Center the throttle servo. Install a servo arm with
a hole 11mm (7/16 in) from the center of the arm.
6. Use a clevis to attach the throttle linkage to the
servo arm.
Adjusting the throttle opening
1. Lower the throttle and center the throttle trim.
2. Adjust the length of the throttle linkage until the
throttle is open 1mm.
3. Move the throttle stick up to confirm the throttle
opens. If the throttle does not open, reverse the
throttle channel in your transmitter.
4. Move the throttle stick and throttle trim down to
confirm the throttle closes.
5. If you reversed the throttle channel in your
transmitter and you are using a 2.4GHz radio
system, you must re-bind your radio system to set
the correct failsafe position.
Summary of Contents for FG-17
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