Evolution Engines 35GT User Manual
© 2005 Manufactured exclusively for Horizon Hobby, Inc.
www.horizonhobby.com
800-535-5551
7795
™
Evolution Engines
26GT/35GT
US ER G UI DE
™
Introduction
Congratulations on your purchase of the newest and one of the most technically advanced 2-stroke gas model airplane
engines in the world. Whether you are new to the sport of model aviation or an experienced flyer, you will enjoy the
features of the new Evolution GT engine.
Evolution engines are designed to be the most powerful in their class, extremely easy to start and operate, and provide
years of enjoyable service. These engines incorporate many unique design features. Each feature is designed to
ensure success with your new engine.
This user’s guide is intended to provide the basic information required to operate and maintain your Evolution GT engine.
Important:
While the Evolution engine is extremely easy to operate, if this is your first experience flying a model airplane,
it is highly recommended that you have the help of an experienced modeler during the first few flights.
Your local hobby shop or flying club can put you in touch with an experienced pilot in your area.
2
Before using this engine, please read these instructions carefully.
Evolution Engines™ 2-Year Warranty
This Evolution Engines product is
guaranteed to be free from defects in
materials and workmanship for a period of
2 years from the date of purchase. During
this time, Evolution’s authorized service
center will repair or replace, at their option,
any defective parts without charge.
This warranty does not apply to damage
or defects resulting from misuse, neglect
or abuse; damage caused by customer
disassembly, use of substandard fuel,
use of incorrect accessories (spark plug,
propeller, etc.); or damage resulting from a
crash or any use of this engine other than
for which it is specifically intended. Any
of the above will automatically void the
warranty of the engine.
Should your engine require warranty or nonwarranty repair service, please package
it carefully and return it to the address at
the right, along with a copy of the original
invoice or receipt and a detailed letter
explaining the problems. Write your name,
address and daytime phone number clearly
on the letter and return it via FedEx, UPS
or insured Parcel Post (Evolution Engines
will not be responsible for product lost en
route).
For repairs not covered under warranty,
please specify in your letter whether you
want an estimate of the repair charges prior
to performing the service (which may cause
a slight delay). Payment for non-warranty
repairs should be made by credit card or
money order. Unless otherwise specified, all
repaired engines will be returned. We will
do everything we can to expedite the service
required to your Evolution product.
_________________________________
Evolution/Horizon Service Center
4105 Fieldstone Road, Champaign, IL 61822
1-217-355-9511
www.horizonhobby.com
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.
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