3
Mounting the Engine
Most model airplane designs make provision for an
engine mount. It is extremely important that the engine
mount be securely mounted to the airplane’s firewall
and that the engine is securely mounted 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
through a conventional beam mount. Use 8x32 screws
(26GT) or 10x32 (35GT). If you decided to fasten the
engine using a flexible motor mount, always choose
parts with enough integrity and strength. Make sure all
screws are tightened and regularly check that they are
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.
Selecting a Suitable Propeller
The Evolution 26GT and 35GT have been designed to
generate maximum power at 8500 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 9000 rpm on the ground.
Suggested Propeller Dimensions
Evolution 26GT
16x8, 16x10, 16x11, 16x12,
17x8, 17x10, 17x12, 18x8
Evolution 35GT
18x8, 18x10, 20x8, 20x10,
20x12, 21x8, 21x10
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.