It is of vital importance, before attempting to operate your engine, to read the general 'SAFETY INSTRUCTIONS AND WARNINGS' section on pages 2-5 of this booklet 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. • Keep these instructions in a safe place so that you may readily refer to them whenever necessary.
CONTENTS SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S.
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. 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.
WARNINGS • Never touch, or allow any • Never operate your engine in an en- object to come into contact with, the rotating parts. closed space. Model engines, like automobile engines, exhaust deadly carbonmonoxide. Run your engine only in an open area. • Model engine fuel is poisonous. Do not allow it to come into contact with the eyes or mouth. Always store it in a clearly marked container and out of the reach of children. • Model engines generate considerable heat.
NOTES • • After starting the engine, carry out any needle- These engine were designed for model helicopters. Do not attempt to use it for any other purpose. valve readjustments after stopping the rotor by closing the throttle to the lowest r.p.m.. Stop the engine before attempting to make other adjustments to the carburetor. • Mount the engine in your model securely, following the manufacturers' recommendations, using appropriate screws and locknuts. • Use an electric starter.
NOTES • Take care that loose clothing (ties, shirt sleeves, scarves etc.) do not come into contact with the rotor. Do not carry loose objects (such as pencils, screwdrivers, etc.) in a shirt pocket from where they could fall through the rotor disc. • For their safety, keep all onlookers (especially small children) well back (at least 20 feet or 6 metres) when preparing your model for flight. If you have to carry the model to the take-off point with the engine running, be especially cautious.
INTRODUCTION Note: The MAX-61SX-H RING "WC" is an up-rated version of the MAX-61SX-H RING helicopter engine. It is aimed at FAI World Championship(hence the suffix 'WC') Class F3C competition. Performance has been increased and the Type 60B carburetor has been modified for easier adjustment. High quality and high performance have been confirmed in exhaustive flight testing and in F3C contest results.
INSTALLING THE GLOWPLUG BASIC ENGINE PARTS Install the washer on the glowplug and screw carefully into cylinderhead, making sure that it is not cross-threaded before tightening firmly. Glowplug Heatsink Head Carburettor Typr 60B Glow plug Washer INSTALLATION OF THE CARBURETOR As delivered, the engine has its carburetor lightly fitted into its intake boss. Secure it as follows. 1.
INSTALLATION OF THE ENGINE The under-surfaces of all O.S. engine beam mounting lugs are precision machined flat and exactyly parallel to the engine's horizontal axis. It is essential that the engine mounts in the model are also accurately made and aligned. If they are not, they will cause stress and distortion within the engine itself, probably resulting in loss of performance and internal damage.
Warning (Very hot) Never touch the nichrome wire while the battery is connected. BEFORE STARTING Tools, accessories, etc. The following items are necessary for operating the engine. 1 Fuel Model glowplug engine fuel of good quality, preferably containing a small percentage of nitromethane. to ge ss. e olta er v ightn Low uce br red e Raisage to volt ease . incr htness brig Battery leads Resistance coil (nichrome wire) 2 Glowplug O.S. No.8 glowplug is installed in the engine.
6 Fuel bottle or pump For filling the fuel tank, a simple, polyethylene "squeeze" bottle, with a suitable spout,is all that is required. Alternatively, 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. 8 Silicone tubing This is required for the connection between the fuel tank and engine.
However, plug life can be extended and engine performance maintained by careful use, i.e.: 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. Recommended O.S. plugs are No.8 and A5. Carefully install plug finger-tight, before final tightening with the correct size plug wrench. • Install a plug suitable for the engine.
FUEL CARBURETOR CONTROLS Select, by practical tests, the most suitable fuel from among the best quality fuels available in your country for helicopter use. For the best throttle response, a fuel containing 10% to 30% nitromethane is preferable. Lubricants may be either castor-oil or a suitable synthetic oil (or . a blend of both) provided that they are always of top quality. For consistent performance and long engine life, it is essential to use fuel containing AT LEAST 18% lubricant by volume.
C The Medium Speed Needle Valve This is an extra control that can be brought into play, if necessary, after adjusting A and B above. It provides the means of fine-tuning mixture strength over that all-important part of a helicopter's throttle range where the model is flying in, or near, the hovering mode. STARTING Be sure to use a muffler pressurized fuel feed. Use the same fuel as you intend to employ for actual operation of your model. 1.
7. Preparation of starting Make sure that the transmitter throttle stick is at the fully closed position and the throttle trim at center position, and make sure that idle-up switch on the transmitter is off. Hold the rotor head by hand so that rotor cannot rotate when the engine is Started. Also, steady the model with a foot on the landinggear skid. 3. Preparation of the starter Install the starting shaft to the starter securely. Poor installation swings the starting shaft, which is dangerous. 4.
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. 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.
• Idle This carburetor is not fitted with a throttle stop screw. Instead, idling speed is adjusted by means of the throttle trim lever on the transmitter. Mixture Control Screw. A special technique is required here. If intending to make an adjustment (e.g. 90˚ in the same direction, before returning it to the new setting. If this procedure is not followed, movement of the throttle rotor may become stiff, resulting in undue loading of the throttle servo.
When satisfactory hovering flight has been achieved, land the modeI again and re-check the engine's idlling qualities. lf, on the other hand, the mixture is too Iean, this wiIl be indicated by a marked lack of exhaust smoke and a tendency for the engine to cut out when the throttle is opened. ln this case, turn the Mixture Control Screw counter-clockwise to enrich the mixture. After about 10 seconds of idling, open the throttle to 'float' the model. lf the transition is smooth, the idle mixture is O.K.
3. Now adjust the High-Speed Needle Valve to achieve the best performance when the model is flying at full throttle. lf, at full throttle, acceleration is poor, the exhaust unduly smoky and the model fails to reach expected straight line speed, the mixture is too rich and the High-Speed Needle Valve setting will need to be reduced. lf, however, after smoothly acceIerating to satisfactory high-speed straight and level flight, power is lost when the model is puIled up into a climb, the mixture is too lean.
SUBSEQUENT READJUSTMENTS CARBURETOR CLEANLINESS Once the engine has been run-in and the carburetor controls properly set up, it should be unnecessary to alter the mixture settings, except to make minor changes to the Main (High-Speed) Needle Valve occasionally, to take account of differences in climatic condisitions.
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.
your refueling container, will prevent the entry of foreign material into the fuel tank. It is also recommended that a good in-line filter be installed between the tank and carburetor. 2. Do not forget to clean the filters regularly to remove dirt and lint that accumulate on the filter screens. Also, clean the carburetor itself occasionally. INSTALLATION OF THROTTLE SERVO After the engine in the helicopter, please observe the following recommendations when linking the throttle servo to the carburetor.
MAX-61SX-HRING"WC" EXPLODED VIEW C.M3.5X15 1 i 2 3 5 22 4 6 y 7 C.M3.
MAX-61SX-HRING"WC" 23 No. Code No.
MAX-61SX-HG/HGLRING"WC" EXPLODED VIEW C.M3.5X15 1-A 1 i 2 3 5 24 4 6 y 7 8 C.M3.
MAX-61SX-HG/HGLRING"WC" 25 No. Code No.
MAX-61RX-HRING"WC" EXPLODED VIEW C.M3.5X15 1 i 2 3 5 26 4 6 y 7 8 C.M3.
MAX-61RX-HRING"WC" 27 No. Code No.
MAX-61RX-HG/HGLRING"WC" EXPLODED VIEW C.M3.5X15 1-A 1 i 2 3 28 5 4 6 y 7 8 C.M3.
MAX-61RX-HG/HGLRING"WC" 29 No. Code No.
60B CARBURETOR EXPLODED VIEW C.M3X8 1-1 3 1 6 8 7 2 9 --1 --3 5-3 C.M2.6X8 --2 5-2 --4 8 N.+M3X4 4 0 = q C.M2.6X5 5-1 w --2 C.M2.
60B CARBURETOR PARTS LIST No. Code No. 1 2 7381 410 1-1 2 2826 131 Description Carburettor Rotor 3 2 7981 920 Metering Nozzle Retaining Screw 5 2 7981 301 5-1 2 7981 850 8 2 7881 120 Throttle Lever Retaining Screw 2 2 7981 200 4 2 7981 220 No. Code No.
61SX-HRING"WC" THREE VIEW DRAWING 25 SPECIFICATIONS 4-φ4.2 9.95 cc (0.607 cu.in.) 24.0mm (0.945 in.) 22.0mm (0.866 in.) 2,000 18,000 r.p.m. 2.2 bhp / 16,000 r.p.m. 600g(21.2oz.) SX-H 52 ~ 42 28 9 2-φ4.2 79 UNF5/16-24 43.5 ■ Displacement ■ Bore ■ Stroke ■ Practical R.P.M. ■ Power output ■ Weight 42.6 61 88.
61RX-HRING"WC" THREE VIEW DRAWING 25 4-φ4.2 SPECIFICATIONS 52 9.95 cc (0.607 cu.in.) 24.0mm (0.945 in.) 22.0mm (0.866 in.) 2,000 18,000 r.p.m. 2.2 bhp / 16,000 r.p.m. 597g(21.1oz.) RX-H ~ 30 10 2-M3.5 79 UNF5/16-24 42 ■ Displacement ■ Bore ■ Stroke ■ Practical R.P.M. ■ Power output ■ Weight 42.6 61 88.
O.S. GENUINE PARTS & ACCESSORIES ■ MIXTURE CONTROL ■ O.S. GLOW PLUGS A5 No.
Q U A L IT Y PRECISION & P ERFO RM AN NC E UN ES LED CE UAL EQ T AB L IS H IN G T H E STA N D A R D S O F EXCE LLE 6-15 3-Chome Imagawa Higashisumiyoshi-ku Osaka 546-0003, Japan TEL. (06) 6702-0225 FAX. (06) 6704-2722 URL : http://www.os-engines.co.jp C Copyright 2001 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan.
