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O.S. Engine Max-50SX-H Ring Owner's Instruction Manual

Summary of Max-50SX-H Ring

  • Page 1

    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 famil...

  • Page 2: Contents

    Contents safety instructions and warnings about your o.S. Engine introduction basic engine parts, installation before starting facts about glow plugs fuel carburetor controls starting running-in,adjustment subsequent readjustments carburettor cleanliness adjusting chart installation of throttle serv...

  • Page 3: Warnings

    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. 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 futu...

  • Page 4: Warnings

    Warnings • • • • • never touch, or allow any object to come into contact with, the rotating parts. Model engine fuel is poison- ous. 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 engine fuel is also ...

  • Page 5: Notes

    Notes • • • • • these engine were designed for model helicopters. Do not attempt to use it for any other purpose. Mount the engine in your model securely, fol- lowing the manufacturers' recommendations, using appropriate screws and locknuts. Install an effective silencer (muffler). Frequent close ex...

  • Page 6: Notes

    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 pen- cils, screwdrivers, etc.) in a shirt pocket from where they could fall through the rotor disc. For their safety, keep all onlookers (especia...

  • Page 7: Introduction

    Because of initial tightness, a standard electric starter may have difficulty in rotating the engine when cold, before it has been adequately run-in. In this case, use a high-torque type starter. Do not, however, confuse tightness with the symptoms of hydraulic lock caused by an excess of fuel withi...

  • Page 8: Basic Engine Parts

    Basic engine parts heatsink head carburettor typr 40e crankshaft propeller nut crankcase drive hub glowplug beam mount installing the glowplug install the washer on the glowplug and screw carefully into cylinder- head, making sure that it is not cross-threaded before tightening firmly. Glow plug was...

  • Page 9: Before Starting

    Front view correct side view top surfaces are in the same plane. Re-align the surfaces as necessary incorrect top surfaces are not in the same plane. Top surfaces are not in the same plane. Engine does not rest firmly. Before starting tools, accessories, etc. The following items are necessary for op...

  • Page 10

    3 glowplug battery the power source for heating the glowplug may be either a large heavy-duty 1.5volt dry cell, or preferably, a 2-volt rechargeable lead-acid cell . 1.5 volt heavy-duty dry battery or 2 volt rechargeable lead-acid cell (at least 5ah) if a 2-volt cell is employed, use a resistance wi...

  • Page 11: Facts About Glowplugs

    Fuel can filter 12v battery starter 7 fuel container filter install a filter on the outlet tube of your refuelling container to prevent entry of foreign matter into the fuel tank 8 silicone tubing this is required for the connection between the fuel tank and engine. 9 hexagon starting shaft this sha...

  • Page 12: Fuel

    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. However, plug life can be extended and engine performance maintained by careful use, i.E.: apart from w...

  • Page 13: Carburetor Controls

    Carburetor controls with a fixed-wing model, power failure is rarely a serious threat to the safety of the aircraft since it can usually glide down to a safe landing. In a helicopter, on the other hand, it is vitally imporant that the engine keeps running and that there is a quick and reliable respo...

  • Page 14: Starting

    Starting close open 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. 2. 3. 77 ° as shown in the sketch, the carburetor has graduation marks. When the triangle mark on the carburetor rotor meets the far right mark, the th...

  • Page 15

    4. 5. 6. Checking the rotating direction of the starter make sure that the starter rotates to the direction shown in the sketch. If the direction is reverse, reverse the leads on battery. Inserting the starter shaft insert the starting shaft into the shaft cup securely. Priming without heating the g...

  • Page 16: Adjustment

    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. While the engine is being run-in set the needle-valve for a slightly rich mixture not excessively rich as this may result in poor throttle...

  • Page 17

    This enables the full r.P.M. Range, from idling to full power, to be controlled by the throttle stick, and then allows the engine to be stopped, from the transmitter, by closing the throttle completely with the trim lever. Set up the throttle linkage as follows: with the transmitter throttle trim le...

  • Page 18

    Hover the model and actuate the throttle to observe response over the medium speed range. Lf the engine smokes excessiveiy and throttle response is poor, the mixture is too rich ; in which case, land the model and turn the needle valve clockwise. Do not close the needie valve too much, keeping it a ...

  • Page 19: Subsequent Readjustments

    O readjustments should therefore be carried out as follows: lf the mid-range throttle response is not rapid and positive (indicating a rich mid-range mixture), turn the needle valve 2 or 3 clicks clockwise, or turn the mixture control screw 1-3 degrees ciockwise. Lf, on the other hand, the response ...

  • Page 20: Carburetor Cleanliness

    Carburetor cleanliness the correct functioning of the carburetor depends on its small fuel orifices remaining clear. The minute particles of foreign matter that are present in any fuel can easily partially obstruct these orifices and upset mixture strength so that engine performance becomes erratic ...

  • Page 21: Adjusting Chart

    Adjusting chart open the needle valve 2 turns from the fully closed position. Make sure that the mixture control valve is at the factory setting. A start the engine warm up the engine b c observe the mixture condition while "floating" the model turn the mixture control screw counter-clockwise idling...

  • Page 22: Care and Maintenance

    Care and maintenance the minute particles of foreign matter, that are present in any fuel may, by accumulating and partially obstructing fuel flow, cause engine performance to become erratic and unreliable. O.S. 'super-filters' (large and small)are available, as optional extras, to deal with this pr...

  • Page 23: Exploded View

    Type of screw c … cap screw m … oval fillister-head screw f … flat head screw n … round head screw s … set screw ✽ exploded view y t r e w q = - 0 9 8 7 6 5 4 3 2 1 c.M3x15 c.M3x8 c.M2.6x18 - -1 i u 22.

  • Page 24: Engine Parts List

    The specifications are subject to alteration for improvement without notice. Engine parts list screw set cover plate gasket set crankshaft crankshaft ball bearing(rear) crankcase crankshaft ball bearing(front) thrust washer propeller nut carburetor retainer assembly carburetor complete 40e connectin...

  • Page 25

    0 9 8 7 6 5 4 3 2 1 -1 1 3 -1 3 -2 3 -3 c.M3x8 9 -1 9 -2 9 -3 9 -4 carburetoer parts list & exploded view the specifications are subject to alteration for improvement without notice. Type of screw c … cap screw m … oval fillister-head screw f … flat head screw n … round head screw s … set screw ✽ no...

  • Page 26: Three View Drawing

    8.17 cc (0.499 cu.In.) 22.0mm (0.866 in.) 21.5mm (0.847 in.) 2,000 ~ 20,000 r.P.M. 1.8 bhp / 17,000 r.P.M. 413g(14.58oz.) ■ ■ ■ ■ ■ ■ three view drawing displacement bore stroke practical r.P.M. Power output weight specifications dimensions(mm) 38 46 52 36 unf1/4-28 61 24.8 56 70.5 18.5 37 37.7 11 4...

  • Page 27

    (71608001) (71521000) (l) no.8 (71605100) a 5 (72403050) (71705000) (55500002) ■ long socket wrench with plug grip ■ super filter ■ o.S. Glow plugs ■ in-flight control needle valve ■ lock washer(10set) m3 o.S. Genuine parts & accessories 26.

  • Page 28

    C copyright 2000 by o.S.Engines mfg. Co., ltd. All rights reserved. Printed in japan. 110103 tel. (06) 6702-0225 fax. (06) 6704-2722 6-15 3-chome imagawa higashisumiyoshi-ku osaka 546-0003, japan url : http://www.Os-engines.Co.Jp u n eq ua ll ed qua lity precision & per for m an ce es ta blis hing t...