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. ENGINE INTRODUCTION BASIC ENGINE PARTS, INSTALLATION BEFORE STARTING 2~5 6 7~8 8~10 FACTS ABOUT GLOW PLUGS FUEL 10~11 CARBURETOR CONTROLS 12~13 STARTING 13~14 RUNNING-IN,ADJUSTMENT 15~18 SUBSEQUENT READJUSTMENTS 18 CARBURETTOR CLEANLINESS 19 ADJUSTING CHART 20 INSTALLATION OF THROTTLE SERVO CARE AND MAINTENANCE 21 ENGINE EXPLODED VIEW & PARTS LIST 1 22~23 CARBURETOR EXPLODED VIEW & PARTS LIST 24 THREE VIEW DRAWING 25 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: This is a high performance engine developed expressly for F3C M class helicopter competition utilizing 50 cubic inch engines. The engine uses the same mounting hole spacing as the O.S. 46FX-H RING making the two engines interchangeable. A special machined drive washer and dual throttle levers are supplied as standard for helicopter use. Because of initial tightness, a standard electric starter may have difficulty in rotating the engine when cold, before it has been adequately run-in.
INSTALLING THE GLOWPLUG BASIC ENGINE PARTS Heatsink Head Install the washer on the glowplug and screw carefully into cylinderhead, making sure that it is not cross-threaded before tightening firmly. Glowplug Carburettor Typr 40E Cover Plate 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.
CORRECT INSTALLATION OF THE CARBURETOR As delivered, the engine has its carburetor lightly fitted into its intake boss. Secure it as follows. 1. Loosen the retainer screw, rotate the carburetor to its correct position and press it well down into the intake boss, compressing the rubber gasket as shown in the sketch, before re-tightening screw. Side view Front view Top surfaces are in the same plane. INCORRECT 2. Rotate the retainer screw gently until it stops, then tighten a further 90-120 degrees.
2 Glowplug O.S. No.8 glowplug is installed in the engine. 4 Plug wrench Used for tightening glowplug. The O.S. long plug wrench is available as an optional accessory. 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 . 5 Battery leads These are used to conduct current from the battery to the glowplug.
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. FACTS ABOUT GLOWPLUGS Fuel Can Filter 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, A5 and A3.
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 FUEL 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 .
BASIC POSITION OF MIXTURE CONTROL VALVE (Mixture Control Screw) 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 response to the throttle in order to ensure safe ascent and descent of the model.
Graduations on the carburetor body Fully opened position Carburetor Body 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. 77° Fully closed position 1. Opening and closing of the Needle-Valve Turn the needle clockwise to close the needle-valve, and turn the needle counter-clockwise to open the needle-valve as shown in the sketch. Carburetor Rotor As shown in the sketch, the carburetor has graduation marks.
4. 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. 8. 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. 9. Stopping the engine Fully pull down the throttle trim on the transmitter. 5.
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.
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 lever fully retarded, adjust the throttle servo linkage so that the throttle rotor is (a) fully open when the transmitter throttle stick is fully advanced and (b) fully closed (i.e.
exhaust unduly smoky and the model fails to reach expected straight line speed, the mixture is too rich and the 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. ln this case, land the model immediately and readjust Needle Valve to a richer setting.
Readjustments should therefore be carried out as follows: SUBSEQUENT READJUSTMENTS 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 adjustments to the Needle Valve occasionally, to take account of variations in climatic condisitions.
CARBURETOR CLEANLINESS Remove this with an 8mm spanner 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 and unreliable.
ADJUSTING CHART A Open the Needle Valve 2 turns from the fully closed position. Make sure that the Mixture Control Valve is at the factory setting.
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.
EXPLODED VIEW C.M3X15 1 i 2 3 22 5 4 6 y 7 C.M3X8 8 u 9 t C.M2.
ENGINE PARTS LIST Description 23 No. Code No.
CARBURETOER PARTS LIST & EXPLODED VIEW C.M3X8 1-1 1 2 4 6 9 9-3 3-3 5 7 0 8 9-4 9-1 9-2 3-2 3-1 3 No. Code No. Description 1 1 2 3 3-1 3-2 3-3 4 5 6 7 8 9 9-1 9-2 9-3 9-4 0 27381410 22826131 25281200 25281600 27881810 27881800 27881820 45581820 25281100 22681953 27881330 27681340 27981900 27981910 24981837 27381940 26711305 29015019 Throttle Lever Assembly Throttle Lever Retaining Screw Carburetor Rotor Mixture Control Valve Assembly "O" Ring (L) (2pcs.) "O" Ring (S) (2pcs.
THREE VIEW DRAWING Dimensions(mm) 17.5 44 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.) 31 51.6 38 56 46 11 37 70.5 UNF1/4-28 37.7 Displacement Bore Stroke Practical R.P.M. Power output Weight 18.5 ■ ■ ■ ■ ■ ■ Ø26.2 SPECIFICATIONS 61 36 52 25 24.
O.S. GENUINE PARTS & ACCESSORIES ■ O.S. GLOW PLUGS A5 No.
TA BL ISH ING NC ES E E ANC UNEQ UA L I TY PRECISION & P ERF QUA ED OR M LL L CEL THE STAN ARDS OF EX D E 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 2000 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan.
