User Manual

PAGE 5 OF 22
Always use a correctly mounted (correct length bolts, no spacers behind it, not touching the spinner cone, etc.),
and properly sized propeller. Never use a propeller that has been damaged, modified or repaired or that has not
been properly balanced.
Always use the correct length propeller bolts and make sure they are tight before every
flight(screw thread-locking glue is recommended)
Always use a heavy duty starter stick or heavy leather work glove to flip the prop. Always have the airframe in a
starting stand and have someone else hold the plane when starting or running the engine. Never operate the
engine where anything (dirt, gravel, clothing, and any loose items) might be drawn into the propeller. Keep
spectators at least 50ft. away from your aircraft when operating the engine.
Unless you are starting it, never turn the engine over without first making sure the ignition is off. Always use an
ignition kill switch and have the throttle setup such that it can be used to stop the engine when necessary. Refer to
Page 5 – SmartFly Ignition Cutoff.
Never mount the engine in anything other than an airframe for which it's designed for use in. Overpowering an
airframe is dangerous and unsafe. Do not use an engine stand to run the engine. A stand may not allow engine
vibration energy to be properly dissipated and may cause failure of the engine mounting parts, propeller, propeller
mounting bolts or stand.
Always fly in accordance with the safety rules, regulations and recommendations of the MAAA. Read and
understand all of the safety material on their website
www.maaa.asn.au/ Before using this engine.
ENGINE INSTALLATION
If using the mounting stand-offs, the cut ends should be mounted to the engine. If additional mounting height is
needed, it should be placed between the mounting hardware (brackets / stand-offs) and the firewall. Make sure that
all spacers are flat and of the same size and surface plane so as not to induce any twisting force into the mounting
hardware or damage to the engine or mounting hardware failure may result. Spacing should never be used
between the mounting hardware and the engine. In all cases, the firewall / airframe mounting surface must be
absolutely flat or potentially damaging forces can be exerted to the engine or mounting hardware which can cause
failure.
Check to see that the carburetor has adequate clearance (at least 1in.) to anything for proper breathing. If it
doesn't, make appropriate adjustments. Make sure that your airplanes fuel tank and lines are made for gasoline
use, that the tank is adequately vented and that the feed line clunk can move freely in all directions and not get
hung up anywhere. We recommend using a filter between your gas supply and airplane fuel tank. If you use a fuel
filter between the airplane tank and the carburetor, make sure it is of adequate size to supply an unobstructed flow
of fuel to the carburetor or the engine may not run correctly.
Make sure that the cowl openings on your plane provide enough airflow for proper cooling. Ideally, all of the cooling
fins of the cylinder should be exposed directly to unobstructed flow of cooling air and there should be 3 times as
much air exit area as intake area. Many planes have cowl openings that actually inhibit proper cooling of single
cylinder engines. Their openings were made to give a scale appearance of the full size planes they are patterned
after. Along with the openings described above, blocking the scale openings either partially or wholly can
significantly help promote cooling air flow over the cylinder fins.
The ignition battery should be mounted externally, near the cowl, at least twelve inches from the receiver or throttle
servo that connects to the receiver. The carburetor needs at least 1 1/2" (38mm) of clearance between the intake
and the bottom of the cowl.
If there is less than 1 1/2", make an opening in the cowl below the carb at least as large as the carb intake
diameter. A long, narrow, screw driver is recommend to drill small holes in the cowl for adjusting the needle valves,
since the carburetor must often be adjusted differently with the cowl on as compared to off.
These engines burn between one and two ounces of fuel per minute. Therefore, a 32 ounce or larger tank is
recommended. The engines are equipped with a diaphragm pump carburetor making tank location not critical
relative to the carburetors fuel entry position. Place the tank on the aircraft’s center of gravity (CG). Then aircraft
trim changes during flight will not be necessary from a full to an empty tank.
Many types of fueling devices (fuel dots, filler valves, etc.) are available for your use. Our experience has shown
that often the simplest is the best. Regardless of which device you decide to use, be very wary of air leaks as they
can be detrimental to the proper operation of your engine.
NOTE: Always use Loctite on engine mounting hardware and make sure your models firewall and engine box are
adequately reinforced (pinned, soaked in thin CA, etc.).
CDI IGNITION SYSTEM