User manual OS ENGINES PEGASUS 320

[. . . ] ENGINE NOTES ON INSTALLING, COOLING-FAN AND CLUTCH INTRODUCTION BASIC ENGINE PARTS INSTALLATION OF THE CARBURETOR INSTALLATION OF THE ENGINE BEFORE STARTING FACTS ABOUT GLOW PLUGS CARBURETOR CONTROLS STARTING 2-5 RUNNING-IN, ADJUSTMENTSUBSEQUENT READJUSTMENTS CARBURETTOR CLEANLINESS ADJUSTING CHART INSTALLATION OF THROTTLE SERVO CARE AND MAINTENANCE O. S. GENUINE PARTS & ACCESSORIES ENGINE EXPLODED VIEW & PARTS LIST 12 13-14 15 16 CARBURETOR EXPLODED VIEW & PARTS LIST THREE VIEW DRAWING 17-20 6 7 21 22 23 24 25 26-27 8 9 10-11 28-29 30 1 SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O. S. ENGINE Remember that your engine is not a "toy", but a highly efficient internalcombustion machine whose power is capable of harming you, or others, if it is misused. As owner, you, alone, are responsible for the safe operation of your engine, so act with discretion and care at all times. [. . . ] 3 Battery leads These are used to conduct current from the battery to the glowplug. Basically, two leads, with clips, are required, but, for greater convenience, twin leads with special glowplug connectors, as shown on the right, are commercially available. Battery leads 4 Glowplug battery The power source for heating the glowplug may be either a large heavy-duty 1. 5volt dry cell, Ni-cd battery or battery integrated booster. 1. 5 volt dry cell Battery Integrated booster 10 In case of 1. 5volt dry cell Battery leads 7 Fuel pump For filling the fuel tank one of the purpose-made manual or electric fuel pumps may be used to transfer fuel directly from your fuel container to the fuel tank. Fuel pumps Manual Electric Make sure glowplug element glows bright red inside room or shadow. 8 Fuel container filter Install a filter on the outlet tube of your refuelling container to prevent entry of foreign matter into the fuel tank 9 Silicone tubing This is required for the connection between the fuel tank and engine. Fuel Can Filter 5 Hexagon starting shaft This shaft mounted on an electric starting motor is driven into the shaft cup to turn the engine. 6 Electric starter and starter battery An electric starter is recommended for starting. Silicone tubing 10 Plug wrench Used for tightening glowplug. long plug wrench is available as an optional accessory. 12V Battery Starter For tightening glowplug 11 FACTS ABOUT GLOWPLUGS Since the compatibility of glowplug and fuel may have a marked effect on performance and reliability, it may be worthwhile to choose the R/C type plug found most suitable after tests. Carefully install plug finger-tight, before final tightening with the correct size plug wrench. However, plug life can be extended and engine performance maintained by careful use, i. e. : Install a plug suitable for the engine. Use fuel containing a moderate percentage of nitromethane. Do not run the engine too lean and do not leave the battery connected while adjusting the needle. The role of the glowplug With a glowplug engine, ignition is initiated by the application of a 1. 5-volt power source. When the battery is disconnected, the heat retained within the combustion chamber remains sufficient to keep the plug filament glowing, thereby continuing to keep the engine running. Ignition timing is 'automatic' : under reduced load, allowing higher rpm, the plug becomes hotter and, appropriately, fires the fuel/air charge earlier; conversely, at reduced rpm, the plug become cooler and ignition is retarded. When to replace the glowplug Apart from when actually burned out, a plug may need to be replaced because it no longer delivers its best performance, such as when: Filament surface has roughened and turned white. Foreign matter has adhered to filament or plug body has corroded. Starting Connect the battery to the glowplug and start the engine by applying the starter. When started, switch off the starter and withdraw the starting shaft after making sure the rotation of the starter shaft stops. Stopping the engine Fully pull down the throttle trim on the transmitter. Hold the rotor head, and pinch the fuel line to stop the fuel supply. If it still does not stop, pull off the fuel line from the carburetor. It is necessary to readjust the throttle linkage so that the carburetor rotor is fully closed when the throttle stick and throttle trim on the transmitter are fully pulled Down. NOTE: If the throttle response is poor or the engine stops due to a temporarily over-rich mixture immediately after the engine is started, pinch the fuel line for one or two seconds until the engine r. p. m. increase and the engine runs steadily. Reminder!Never touch, or allow any object to come into contact with, the rotating rotor. 16 RUNNING-IN ("Breaking-in") All internal-combustion engines benefit, to some degree, from extra care when they are run for the first few times known as running-in or breaking-in. This is allows the working parts to mate together under load at operating temperature. engines are made with the aid of the finest modern precision machinely and from the best and most suitable materrials, only a very short and simple running-in procedure is required and can be carried out with the engine installed in the model. For the first few flights with a new engine i. e. [. . . ] It is recommended that fuel is passed through a filter when the tank is filled and that a good in-line filter is installed between the fuel tank and carburetor and, furthermore, that this filter is frequently cleaned to remove dirt and lint that accumulates on the filter screen. Finally, occasionally remove the needle-valve holder from the carburetor as shown in Photo and extract any remaining foreign matter that may have lodged in the location shown in Photo, right. Remove this with an 8mm spanner Dirt and fbrous matter mostly accumulate here 21 ADJUSTING CHART High Speed Needle Valve - 2 turns opened from fully closed position. Medium Speed Needle Valve - 1 turns opened from fully closed position. Idle Mixture Control Screw - 2 turns opened from fully closed position. Start the engine Warm up the engine Observe the mixture condition while "floating" the model Lean mixture Turn the Idle Mixture Control Screw counterclockwise 10 degrees Rich mixture Turn the Idle Mixture Control Screw clockwise 10 degrees Idling OK Observe the hovering mixture condition Lean mixture Open the High Speed Needle Valve (Turn counter-clockwise) Rich mixture Close the High Speed Needle Valve (Turn clockwise) Hovering OK Land the model 22 Idle for approx: 10 seconds, then reopen throttle to observe transition ("Float" the model) Lean mixture Turn the Idle Mixture Control Screw counterclockwise 10 degrees Rich mixture Turn the Idle Mixture Control Screw clockwise 10 degrees Idling OK High Speed Flight Lean mixture Open the High Speed Needle Valve (Turn counter-clockwise) Rich mixture Close the High Speed Needle Valve (Turn clockwise) High Speed Flight OK Fine tuning of idling mixture Lean mixture Turn the Idle Mixture Control Screw counterclockwise 10 degrees Idling OK Rich mixture Turn the Idle Mixture Control Screw clockwise 10 degrees Fine tuning of hovering mixture Lean mixture Rich mixture Open the Medium Speed Needle Valve Hovering OK Adjustment completed Close the Medium Speed Needle Valve INSTALLATION OF THROTTLE SERVO After the engine is installed in the helicopter, please observe the following recommendations when linking the throttle servo to the carburetor. Locate the servo so that its output arm and the throttle pushrod are, as close as possible, directry in line with carburetor's throttle arm, as shown. Servo output arm Throttle control rod A and B should be equal length. [. . . ]