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Two stroke glow gasoline |
GGT15 |
600930400000 |
engine for airplanes |
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It is of vital importance, before attempting to operate your engine, to read the general 'SAFETY INSTRUCTIONS AND WARNINGS' in the following section and to strictly adhere to the advice contained therein.
Also, please study the entire contents of this instruction manual, so as to familiarize yourself with the controls and other features of the engine.
SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE
Remember that your engine is not a " toy ", but a highly efficient internal-combustion machine whose power is capable of harming you or others, if it is misused or abused. As owner, you, alone, are responsible for the safe operation of your engine, so act with discretion and care at all times. If at some future date, your O.S. engine is acquired by another person, we would respectfully request that these instructions are also passed on to its new owner.
The advice which follows is grouped under two headings according to the degree of damage or danger which might arise through misuse or neglect.
WARNINGS
These cover events which might involve serious (in extreme circumstances, even fatal) injury.
NOTES
These cover the many other possibilities, generally less obvious sources of danger, but which, under certain circumstances, may also cause damage or injury.
WARNINGS
Never touch, or allow any object to come into contact with the rotating propeller and do not crouch over the engine when it is
running.
Gasoline is poisonous. Do not allow it come into contact with the eyes or mouth. Always store it in a clearly marked container in a cool and dark place and out of the reach of children. There is a possibility that it may damage your health.
Gasoline is highly flammable. Keep it away from an open flame, excessive heat, sources of sparks, or anything else which might cause it to ignite. Do not smoke or allow anyone else to smoke near to it.
Carry out the mixing of the gasoline and oil outdoors or in a well ventilated place away from any source of fire to prevent the possibility of a fire.
Refill the fuel tank only after the engine is well cooled down, or there is a danger of fire.
Go outside and stay away from the vaporized gasoline when you check the power distribution of the glow plug attached to the glow plug igniter by looking at the filament. Failing to do so may cause fire.
Model engines generate considerable heat. Do not touch any part of your engine until it has cooled. Contact with the muffler
(silencer), cylinder head or exhaust header pipe, in particular, may results in a serious burn.
Observe the laws and regulations in each country and district concerning the usage, transportation and storage of gasoline. Ask details at the fire station in each district.
Never operate your engine in an enclosed space. Model engines, like automobile engines, exhaust deadly carbon-monoxide. Run your engine only in an open area.
Do not operate the engine nor model alone, or there is a possibility of injury.
NOTES
Any propeller requires utmost attention to handle. Be sure to follow the instruction manual supplied with a propeller.
This engine was designed for model aircraft. Do not attempt to use it for any other purpose.
Start the engine only after installing it in the model. Do not start the engine before installing it in the model, or there is a possibility of injury.
Be sure to use an effective silencer (muffler). Frequent exposure to an open exhaust may eventually impair your hearing. Such noise is also likely to cause annoyance to others over a wide area.
Mount the engine in your model securely, following the manufacturers’ recommendations.
For their safety, keep all onlookers (especially small children) well back (at least 10 meters) when preparing your model for flight.
Install a top-quality propeller of the diameter and pitch specified for the engine and aircraft.
Discard any propeller which has become split, cracked, nicked or otherwise rendered unsafe. Never attempt to repair such a propeller: destroy it. Do not modify a propeller in any way.
Install the propeller on the shaft so that the curved face of the blades faces forward – i.e. in the direction of flight. Firmly tighten the propeller washer and propeller installing screws using the correct size wrench. Always check the tightness of propeller installing screws and retighten them, if necessary, before starting the engine. Also, check the tightness of all the screws and nuts before restarting the engine.
Always check the throttle linkage.If it is disconnected, throttle action becomes uncontrollable, which may result in a serious accident.
Take care that loose clothing (ties, shirt sleeves, scarves, etc.) do not come into contact with the propeller. Do not carry loose objects (such as pencils, screwdrivers, etc.) in a shirt pocket from where they could fall through the propeller arc.
Use an electric starter for this engine. The wearing of safety glasses is also strongly recommended.
If you try hand starting, be sure to use a chicken stick or heavy glove. Never attempt to start the engine with a bare hand.
Be sure to carry out adjustments of the high speed needle and slow speed needle after stopping the engine.
Do not start your engine in an area containing loose gravel or sand. The propeller may throw such material in your face and eyes and cause injury.
If you have to carry the model to the take-off point with the engine running, be especially cautious. Keep the propeller pointed away from you and walk well clear of spectators.
To stop the engine, fully close the throttle valve via the transmitter to shut off the fuel supply. Otherwise there is a possibility of injury.
Do not crank the engine right after the engine is stopped because the engine may start with a crank even when the glow plug is not ignited. Failing to do so may cause injury.
Connect the throttle linkage so that the engine can be stopped via radio operation.
ABOUT THE ENGINE
How to adjusting the carburetor of this engine is completely different from that for the conventional glow engine’s carburetor. Please study the CARBURETOR ADJUSTMENT section so as to familiarize yourself with the controls and other features.
GGT15 is a glow gasoline engine ignited by a glow plug but using gasoline. So no ignition module and battery is required.
This engine is designed for experienced fliers. Beginners and newcomers should not use this engine.
The engine unit, silencer and carburetor are specially designed.
The normal rotation direction of the engine is counterclockwise facing to the propeller.
It offers broad power characteristics suitable for sport flight as well as acro flight.
The large and dense cooling fins ensure sufficient cooling against overheating.
We apply a “G5” glow plug to GGT15, which is exclusively developed for Glow Gasoline engines. Buy only the same glow plug when you replace it to the new one due to a break or deterioration. The conventional glow plugs for alcohol based glow engines such as No.6 (A3), No.7, No.8, No.10 (A5) are not applicable to GGT15.
The supplied E-4040 silencer develops very efficient silencing.
STANDARD ACCESSORIES
E-4040 Silencer Assembly Silencer Retaining Screw
(M4x40 2pcs.)
ENGINE PARTS NAME
E-4040 Silencer
Cylinder Head
Carburetor
Type 61H
Drive Hub
Propeller Washer
Propeller Nut |
Crankcase |
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Crankshaft |
Lock Nut |
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Glow Gasoline |
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Plug G5 |
Beam Mount
Pump Unit PD-08 |
Cover Plate |
INSTALLATION
It is suggested to use an engine mount as heavy and rigid as possible for highest performance and safe running. Install the engine on a mount using at least 3mm steel screws, such as Allen type, with locknuts, for bolting the engine to the bearers.
Also, use the Nord Lock Washers (optional extra) and other anti-loosening washers or apply locking agent.
Be sure that there is sufficient air intake and outlet area on the model for engine cooling to avoid overheating. (Pay careful attention to the cooling since a gasoline engine generates more heat than an alcohol based glow engine.)
INSTALLATION OF SILENCER
Secure the silencer to the engine by means of two retaining screws supplied after the engine is securely mounted on a model.
The exhaust outlet of the silencer can be rotated by 90 degrees in the following manner.
1.Loosen the locknut of the silencer and assembly screw.
2.Set the exhaust outlet at the required position by rotating the rear part of the silencer.
3.Re-tighten the assembly screw, followed by the locknut.
It is recommended to seal the fitting faces of engine exhaust and silencer with liquid gasket. Gasket at the joint part of the silencer will lose its sealing effect in a long time running. In this case, replace the gasket or apply liquid gasket to the joint.
FUEL TANK & LINES
Use a tank designed for gasoline. (Tanks designed for glow fuel use a rubber cap which is deteriorated by gasoline.)
A 200cc tank will provide 12 to 13 minutes flight.(With full throttle, it will provide 8 to 10 minutes flight.)
Install a commercially available gasoline fuel filter between fuel tank and carburetor. (Clean the filter from time to time.)
For plumbing use TYGON
F-4040 (Yellow color) or strong nitrile rubber of more than 2.4-3.2mm ID and 4.8-6.4mm OD. Replace tubing periodically as it becomes hardened. (Replace tubing inside the fuel tank every six months.)
For the plumbing in the fuel tank, we recommend using O.S. fluororubber tube 2 mm ID x 4 mm OD x 500 mm length (code # 28382100).
Use fuel line keepers of stainless wire, etc. at the end of the tubing to prevent the tubing from coming off.
This engine does not require a muffler pressurized fuel system but be sure to provide an air vent.
Be sure to install an in-line fuel filter between the tank and carburetor to prevent foreign matter in the tank from entering the carburetor. Clean the filter periodically.
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Be sure to use fuel line keepers of |
Be sure to equip stainless wire, etc. to prevent tubing |
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air vent pipe. |
from coming off. |
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Be sure to replace tubing |
To the fuel |
inside periodically. |
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pump inlet |
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tubing for |
Be sure to use a gasoline |
re-fuelling |
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resistant fuel tank cap. |
CARBURETOR PARTS NAME |
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Throttle Lever |
Regulator |
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Fuel Inlet |
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Needle Valve |
Mixture Control Valve
Two adjustable controls are provided on this carburetor.
The Needle-Valve
For adjusting the mixture strength when the throttle is fully open Needle-valve adjustment effect the mixture strength at round mid speed.
The Mixture Control Valve
For adjusting the mixture strength at part-throttle and idle speed, to obtain steady idling and smooth acceleration to mid speed.
Please note with this carburetor, needle-valve adjustment does not effect the mixture control valve adjustment but the mixture control valve adjustment effects the needle-valve adjustment. Therefore, it is required to adjust also the needle-valve when the mixture control valve is adjusted. Mixture control valve is pre-set at the near-best position when the engine leaves the factory. Therefore, it is not necessary to adjust the mixture control valve until running-in is completed.
CARE OF FUEL PUMP & REGULATOR
NEVER disassemble the fuel pump or pressure regulator. Their original performance may not be restored after reassembly.
DO NOT allow foreign matter to enter the fuel system. Dirt inside the pump or regulator, no matter how small, may obstruct the flow of fuel and prevent these components from working properly.
NEVER insert anything into the inlet or outlet nipples in an attempt to clear a suspected obstruction.
DO NOT obstruct the small rectangular hole at the bottom of the regulator, nor the regulator will not function correctly.
ALWAYS use fuel filters. Keep the fuel tank scrupulously clean and filter all fuel as it enters the tank (e.g.via an O.S.'Super-Filter' Code No.72403050) and use a good quality in-line filter between the tank and pump. Remember to inspect filter screens at regular intervals and rinse clean as necessary.
NEVER use kerosene, thinner or any organic solvent for cleansing the pump. Rubber parts will be ruined by these materials. Use only alcohol (methanol) or gasoline.
THROTTLE LINKAGE
Before connecting the throttle to its servo, make sure that the throttle arm and linkage safely clear any adjacent part of the airframe structure, etc., as the throttle is opened and closed. Connect the linkage so that the throttle is fully closed when the transmitter throttle stick and its trim lever are at their lowest settings and fully open when the throttle stick is in its fully-open position. Carefully align the appropriate holes in the throttle arm and servo horn so that they move symmetrically and smoothly through their full travel.
PROPELLER
The choice of propeller depends on the design and weight of the aircraft and on the type of flying in which you will be engaged. Determine the best size and type after practical experimentation. As s starting point, refer to the props listed in the table shown below. Slightly larger, or even slightly smaller props than those shown in the table may be used, but remember that propeller noise will increase if blade tip velocity is raised due to high rpm or if a larger diameter/lower pitch prop is used. Be well aware that the propeller rotating arc will increase when using a larger propeller with this engine. Carry out the needle adjustments only after stopping the engine. Do not allow your face or hands to come close to the rotating prop.
Type |
Size (DxP) |
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Sport/Acro/Scale |
13x8-11 14x8-10 15x6-8 |
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Warning:
Make sure that the propeller is well balanced.
An unbalanced propeller and/or spinner can cause serious vibration which may weaken parts of the airframe or affect the safety of the radio-control system. Do not use any propeller which has become split, cracked or nicked even very slightly, or received strong impact even if no apparent damage is visible.
PROPELLER & SPINNER ATTACHMENT
There is a risk, particularly with powerful two-stroke engines, of the propeller flying off if the prop nut loosens due to detonation ("knocking") in the combustion chamber when the engine is operated too lean, or under an excessively heavy load.
Obviously, this can be very hazardous. To eliminate such dangers, the O.S. Safety Locknut Assembly was devised.
Install this as follows:
1.Ream the propeller shaft hole to 8.1mm bore with an appropriate reamer, checking that the hole is exactly centered.
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To be equal |
To be equal |
Ream to 8.1mm dia. |
2.Install the prop to the engine shaft, followed by the retaining washer and prop nut and tighten firmly with a 14mm wrench. (not supplied).
3.Add the special tapered and slotted locknut and secure with a 12mm wrench while holding the prop nut with the 14mm wrench. (not supplied).
Note:
Some spinners which are retained at the top of the cone cannot be used with the prop locknut supplied with the engine. In this case, optional locknut sets are available from O.S. – Propeller Locknut Set for Spinner (Code No.45910200 4mm) and (Code No.45910300 5mm).
NOTE:
Make a habit of always checking the tightness of the propeller before starting the engine. Remember that, especially with wooden propellers, there is a tendency for the material to shrink, or for it to be reduced by the serrated face of the drive hub. Retighten the propeller nut if necessary after loosening the Safety Propeller Locknut. The locknut should be tightened firmly after retightening the propeller nut.
Since the GGT15 is intended to be started with an electric starter, the addition of a spinner assembly for centering the starter sleeve is desirable.
Special propeller locknut sets are available for use with spinners. Use a good quality well balanced spinner, enclosing the propeller boss.
Make sure that it is of precision-made and sturdy construction so that the spinner shell cannot loosen when the starter is used.
Make sure the spinner notches do not interfere the propeller. If they do, cut the notches to clear.
MIXING OF OIL
Use regular gasoline. (No need to use high octane gasoline.)
Alcohol based glow fuel cannot be used in this engine. Not only will the engine not work properly but the internal carburetor plastic parts will be damaged.
Use high quality commercially available 2 stroke engine oil.
Follow the oil manufacturer’s recommendations concerning the mixture ratio of gasoline and oil.
If there is no recommendation, mix with a 25~30:1.
We have checked the following oils with the mixture of 50:1.
KLOTZ ModeLube®
AMSOIL Saber
Zenoah Genuine FC Class
Concerning the mixture ratio for running-in, follow the instructions in the RUNNING-IN section.
With a gasoline engine, passages in the carburetor are narrower than that of a glow engine, and therefore very sensitive against foreign matter such as dust. It is suggested to use optional accessory Super Filter L (Code No. 72403050) when filling a tank in the model from a container used for transportation or storing.
GLOWPLUG IGNITER
A glow plug heater for GGT15 is nothing special. You can use a conventional glow plug igniter.
You may find the G5 glow plug filament does not glow as bright as the conventional glow plugs.
But you can start the engine without difficulties since the flashpoint of gasoline is lower than that of alcohol based glow fuel.
RUNNING-IN
Use a fuel with increased oil content and set the needle a little on the rich side. Too rich a needle setting may cause misfiring or erratic running due to fouling of the plug.
Use a 25:1 fuel/oil mixture if the particular brand of oil states 50:1 mix. Use a 20:1 fuel/oil mixture if the particular brand of oil states 25:1 mix.
Set only the high speed needle 200 below maximum rpm. The low speed needle need not be richened.
No need to carry out running-in on a bench nor with the model fixed. Just fly the model with the above mentioned fuel and needle setting.
A total of 10 flights (2 litters fuel) are required.
Avoid prolonged full throttle running at initial stage, and gradually extend the full throttle running time.
WARNING:
When ground running the engine, avoid dusty or sandy locations. If dust or grit is drawn into the engine, this can have a ruinous effect, drastically shortening engine life in a matter of minutes.
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