Global Services 18480 Bandilier Circle Fountain Valley, CA 92708 Phone: (714) 963-0329 Fax: (714) 964-6236 Email: [email protected]
PROPELLER, GLOW PLUG & FUEL
The diameter and pitch of the propeller needed for your XL RFS series
engine will vary greatly depending on the application the engine is used in.
The weight, drag and the type of model and how you intend to fly it are all
factors in determining the correct size propeller to use. Experimentation
will be necessary to find the optimal size propeller for your particular
application. Ideally you want a propeller that the engine will turn in the
10,000 - 12,000 rpm range on the ground, yet power the airplane sufficiently.
Using a propeller that is too small will cause the engine to run at too high an
rpm. Using a propeller that is too large will cause the engine to run at too low
an rpm and cause it to lug down too much. In both instances this can lead to
premature engine wear and eventual failure.
PROPELLER SIZE RECOMMENDATIONS FOR XL .80RFS
Propeller Recommendation
Use for
Break-In
Glow Plug Recommendation
Glow plugs can make a big difference in the performance of your engine.
We recommend using a hot heat-range glow plug intended specifically for
four-stroke engines. Do not use a cold heat-range plug or a plug designed
for two-stroke engines. This can lead to erratic engine runs and eventual
engine wear and failure.
Fuel Recommendation
Fuel can make a big difference in the way your engine performs. We
recommend using two types of fuel with your XL RFS series engine. For the
break-in period you must use a fuel containing no more than 10% nitro
methane and no less than 18% Castor/synthetic blend lubricant. Use of fuel
containing more than the recommended percentage of nitro methane or only
synthetic lubricants will cause the engine to run too hot and result in excessive
wear and engine failure in a very short period of time. Once the engine has been
HIGH & LOW SPEED NEEDLE VALVES
High Speed Needle Valve
The high speed needle valve is used to meter the air/fuel mixture at full
throttle. Turn the needle clockwise to lean the mixture or turn the needle
counterclockwise to richen the mixture. When you start the engine for the
very first time the needle valve should be turned in completely, then backed
out 2-1/2 turns. When you start the engine after that, leave the needle valve
in the same position it was in when you shut down the engine.
Low Speed Needle Valve
The low speed needle valve regulates the air/fuel mixture at idle and during
transition from idle to full throttle. Turn the idle mixture screw clockwise to
lean the mixture. Turn it counterclockwise to richen the mixture. The idle
mixture screw is preset from the factory, but minor adjustments may need to
be made after the engine is broken in.
To reset the mixture screw to the
factory setting, open the carburetor barrel completely. While holding
the barrel open, turn the mixture screw OUT until it stops. From this
point, turn the mixture screw IN 4-1/4 turns. This is the factory setting.
STARTING PROCEDURE
Your XL RFS series engine can be started using an electric starter or it can
be started by hand. For safety and ease of starting, especially when the
engine is new, we recommend using an electric starter. The following two
procedures should be done with the power to the glow plug off.
Starting Using an Electric Starter
When using an electric starter it is not necessary to choke and prime the
engine. The starter turns the engine over fast enough that the engine draws
fuel on its own. Priming the engine prior to using an electric starter can
cause the engine to "hydro-lock" or flood. This is a result of too much fuel in
the engine before it actually fires.
Turning the engine over with an
electric starter while the engine is flooded can cause extreme damage
to the engine and/or cause the propeller assembly to come loose. Turn
the propeller through the compression stroke one time by hand to check
for a hydro-locked state before applying the starter.
13 x 6
12 x 6
12 x 8-10
13 x 7
13 x 8
The diameter of the crankshaft is 5/16". Using a 5/16" drill bit or a prop
reamer, enlarge the hole in the
propeller hub to fit the crankshaft.
Slide the propeller onto the
crankshaft, up against the thrust
washer. Slide the propeller
washer up against the propeller
and thread the prop nut into place.
Tighten the prop nut firmly to
secure the propeller in place, then
install and tighten the safety nut
against the propeller nut. When tightening the nuts, use an adjustable
wrench. Do not use pliers.
WARNING
If you are installing a spinner onto your engine, the cone of
the spinner must not rub against the propeller. Allowing the spinner cone
to rub against the propeller could lead to propeller damage and eventual
propeller failure.
PROPELLER SIZE RECOMMENDATIONS FOR XL .91RFS
Use for
Break-In
14 x 6
13 x 6
13 x 8
14 x 8
adequately broken in (about 1/2 gallon of the recommended break-in fuel),
a fuel containing up to, but no more than, 15% nitro methane and no less
than 16% Castor/synthetic blend lubricant fuel can be used.
WARNING
We do not recommend using fuels that contain only
synthetic lubricants. Synthetic lubricants have a much lower flash point
than Castor Oil lubricants. Flash point is the point at which the lubricant
begins to actually burn and lose its lubricating qualities. Using fuels
containing a blend of Castor Oil and synthetic lubricants results in an
engine that runs cooler and lasts longer. One lean run using a fuel
containing only synthetic lubricants can cause engine failure. Using fuels
with a Castor Oil and synthetic blend of lubricants greatly reduces this chance.
Starting by Hand
When starting the engine by hand always use a chicken stick or a heavy
leather glove. Never just use your bare hand or serious injury could result.
To make the engine easier to start by hand it should first be primed. This is
done by opening the carburetor barrel completely and turning the choke lever
to close off the carburetor opening. Fuel can then be drawn into the engine
by "pulling" the propeller through the compression stroke 2 - 3 times. This
will draw fuel into the engine. Release the choke lever and pull the propeller
through the compression stroke once to check for a hydro-locked condition.
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