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3
Mounting the Engine
Most model airplane designs make provision for an engine
mount. It is extremely important that the engine mount be
securely attached to the airplane’s firewall and that the engine
is securely attached to the engine mount. Follow the instructions
included with the airplane for mounting the engine. The engine
should be fastened in place with 4 screws. Use 1/4” or 6mm
screws. If you decided to fasten the engine using a flexible motor
mount, always choose parts with enough solidity and strength.
Make sure all screws are tightened and regularly check that they
remain tight and in good condition.
Important: Air is necessary to cool the engine during operation.
Make sure that sufficient air circulation through the cowling is
provided. As a basic reference, the outlet area should be 3–5 times
the area of the inlet area to provide adequate cooling.
Throttle Linkage
Carefully attach the throttle linkage to the engine using a ball
link on the carburetor. Make sure that the linkage is free to
operate from low throttle to high throttle and confirm that the low
throttle setting on the transmitter closes the carburetor butterfly
to the low idle position. Adjust the length of the pushrod until full
throttle opens the carburetor butterfly fully, while low throttle, low
trim completely closes the butterfly.
Attaching the Fuel Lines
Use medium gasoline-compatible fuel line in the fuel tank as
well as the supply line to the engine.
Fuel for the Evolution Gas Engine
The Evolution gas engine has been designed to run on a mixture
of high-quality unleaded gasoline and synthetic oil intended for
racing 2-stroke gasoline engines. For the break-in period of the
new engine, mix the fuel in a ratio of 30 parts gasoline to 1 part
lubricant. After break in, use a ratio of 40 parts gasoline to 1
part lubricant.
Selecting a Suitable Propeller
The Evolution 45GX and 58GX have been designed to generate
maximum power at 6100–6300 rpm, according to the type
of exhaust used. If you wish to utilize the maximum power
output, choose a propeller which will allow the engine to reach
these revolutions, or slightly lower revolutions (The engine will
unload in the air depending on the aircraft speed and propeller
selected).
We do not recommend using propellers that allow the engine to
reach more than 7500 rpm on the ground.
Suggested Propeller Dimensions
These engines (45GX2 and 58GX2) are designed for optimum
performance and torque when operated between 6100–6400
rpm. Choose your propeller according to the chart and to achieve
approximately 6300 rpm on the ground for best performance
and the lowest noise signature. Maximum horsepower occurs
between 7200–7400 rpm, but expect much higher propeller
noise at these tip speeds.
45GX
58GX
Aerobatics
Two-blade
Three-blade
Two-blade
Three-blade
Scale flying
22x10
26x8 26x10
21x10
24x10
24x12
22x8 23x8 23x10 24x8 24x10
21x12 22x8 22x10
22x12 24x9 24x10
24x8 24x9 24x10 24x12
25x7 25x8 25x9 25x10
26x7 26x8 26x9 26x10
25x12
8103.3_EVO_4558.manual.indd 3 6/16/06 10:23:13 AM