Propeller - Saito FG-14C Owner's Operating Instruction Manual

Figure 1
FG-14C = 14mm wrench
FG-21 = 17mm wrench
Throttle Linkage
Carefully attach the throttle linkage to the engine using a ball link on the carburetor throttle arm. Make sure the
linkage is free to operate from low to high throttle. Also, confirm that the low throttle setting on the transmitter
closes the carburetor throttle barrel to the low-idle position. Adjust the length of the pushrod until full throttle
opens the carburetor throttle barrel to the fully open position and low throttle, low trim completely closes the
throttle barrel.

Propeller

Recommended Propeller Sizes: The recommended
propeller sizes are shown in the table below. 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 the initial break-in and approximately 20
subsequent flights.
Propeller and Fuel Consumption
In order to decrease fuel consumption and prolong the life of the engine, choose a propeller that maximizes rpm when
the throttle is fully open, and an airframe that performs flights at about 90% of the propeller output. If the load is large
(the diameter and pitch of the propeller is large), the air-fuel mixture will have to be rich. If the load is small, the rpm
will be high, but the fuel consumption is less due to the high-speed needle valve being leaned out more.
6
When you attach the muffler, use a drop of oil on the
threads to ease the assembly. Screw the exhaust
manifold into the engine exhaust port and the muffler
as far as the thread will allow (see above drawing).
Notice the use of the two wrenches used in tightening
the two nuts on the muffler/manifold connection. Use of
threadlock is recommended.
Remember to ensure cooling air passes by the engine
and muffler in a cowled environment.
NOTICE: Air is necessary to cool the engine during
operation. Make sure sufficient air circulation through
the cowling is provided. As a basic reference, the
outlet area should be 3 to 5 times the area of the
inlet area to provide adequate cooling.
Diameter x Pitch (inches)
FG-14C FG-17
13 x 8 14 x8
14 x 6–8 15 x 6–8
15 x 4 16 x 6
The engine produces the maximum output when the
engine is running at about 8,500–9,200 ground rpm
for the FG-14C and 8,300–9,000 ground rpm for the
FG-17/FG-21.
FG-21
15 x 6–10
16 x 6–8
17 x 6
3 blade 15 x 7–9