Adjustment middle range performance
As previously stated, in helicopter flight, throttle response at
medium (hovering) speeds is most important. If the Mixture Metering
Screw (low speed) and Needle Valve (high speed) are properly
balanced, the mixture will be correct, through the medium speed
range.
If, however, minor re-adjustments prove to be necessary for the
best possible throttle response, proceed as indicated by the
following symptoms and required corrective action:
1) If the mixtu re at middle range is lean, gradually increased
engine speed is accompanied by diminished exhaust smoke
and a high-pitched exhaust sound if hovering is prolonged. In
extreme cases, the engine will overheat and lose speed, so that
hovering cannot be maintained. In this event, open the Needle
Valve l5 to 30 degrees and turn the Mixture Metering Screw
30 t0 45 degrees counter-clockwise.
2)If the mixture at middle rang e is too rich, pos itive and quick
throttle response will not be obtained, the exhaust smoke will
be dense and the exhaust sound will be lower, pr obably
accompanied by fuselage vibration. In this even, close the
Needle Valve 30 to 60 degrees and turn the Mixture Metering
Screw 45 to 90 degrees clockwise.
Note: It is most important to make the Needle Valve adjustment
in small increments of not more than 15 to 30 degrees and the
Mixture Metering Screw adjustment not more than 30 to 45
degrees as advised, when seeking optimum middle range throttle
response. Excessive re-adjustment will upset either low speed
performance or high speed performance. Carry out re-
adjustments patiently until the best balance of idling, hovering
and high speed performance is achieved and the engine responds
quickly and positively to the throttle control. Throttle response
at hovering speeds is also affected by the relationship of the
main rotor pitch angle to throttle opening. If the optimum middle
range, throttle response cannot be obtained by the carburetor
adjustments described above, try adjusting the helicopter's pitch
control characteristics.
ENGINE CARE
Always keep the outside of your engine clean. Use clean, fresh
fuel and keep your fuel can, pump, and fueling system free from
dirt particles. Install a fresh fuel filter between the fuel tank and
carburetor, and between your fuel pump and filling line to prevent
any potential of dirt entering your engi ne. Model fuel contains
alcohol, which is hydroscopic (meaning that it attracts moisture
from the atmosphere) . This can cause corrosion to the internal
engine parts. After each flying session, run all the fuel out from
inside the engine and disconnect the fuel line from the carburetor.
Put 4 or 5 drops of after-run oil (Marvel Mystery Oil, Prather,
Pacer, etc.) into the carburetor and turn the propeller over by hand
several times to protect the engine bearings and internal parts
from corrosion. The use of after-run oil is also important during
periods of prolonged storage (such as winter). We suggest removing
the engine from the model, and liberally applying oil into the
carburetor and glow plug hole, wrap your engine in a soft cloth
and store in a sealed plastic bag.
Do not dismantle your engine unnecessarily, as this may upset
precision fits. If it is necessary to clean your engine completely
(such as after a crash), remove only the needle valve assembly
and ventri carburetor, muffler, backplate, and cylinder head. Flush
the entire engine with fresh fuel and reassemble.
On the piston/ring set, there is a small pin in the piston ring groove
to fit the ring. If you have to dismantle the piston/ring from the
engine, you must take care the position of the pin. When you re-
install the piston, you should follow the original setting. Incorrect
installation of the piston/ring will cause serious damage of the
engine.Apply after-run oil to the engine and store or re-install into
the model. Do not dissemble your engine further than described
above, or your warranty may be voided!
INSTALLATION OF THE PISTON
There is a point mark on the piston top surface.
When you reassemble the engine, this mark
should be toward the front of the engine as
you install the piston. If the direction is not correct,
the piston ring would be stuck with the ports
on cylinder.
WARRANTY
Your engi ne is guaranteed to be free from defects in materials
and workmanship for a period of 3 years from the date of purchase
when returned for service accompani ed by proof of purchase
(register receipt, credit card invoice, etc.). Crash damage or
problems caused by improper use are specifically not covered
under this warranty. Damage caused by customer disassembly,
use of improper or substandard fuel, use of improper accessories
(such as propellers, glow plugs, etc.) or any use of the product
other than its specific intended use will automatically void this
warranty.
SERVICE PROCEDURES
Should your Thunder Tiger engine require service, please follow
the following guidelines:
1. Do not return the engine to the place of purchase, as they are
notauthorized or equipped to perform service.
2. Remove the engine from the model. We cannot accept
equipment for service other than the engine.
3. Along with your engine and proof of purchase, enclose a
complete written explanation detailing the problem(s) with your
engine. Be sure to include your name, address and daytime
telephone number.
4. For repairs not covered under warranty, the charges will be
billed to you C.O.D. Please mention if you wish to have an
estimate of non-warranty repair charges prior to us beginning
service. (This may cause a slight delay in your repair.)
5. For customer s outside of the U.S. and Canada, contact the
authorized Thunder Tiger agent in your country.
6. For U.S. and Canadian customers, send your engine via
insured mail or U.P.S. to ACE HOBBY DISTRIBUTORS INC.,
2055 Main Street, Irvine, CA 92614
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