It is of vital importance, before attempting to operate your engine, to read the general 'SAFETY INSTRUCTIONS AND WARNINGS' section on pages 2-6 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 object to come • Model engine fuel is also highly flammable. Keep it away from open flame, excessive heat, sources of sparks, or anything else which might ignite it. Do not smoke or allow anyone else to smoke, near to it. into contact with, the rotating propeller and do not crouch over the engine when it is running.
NOTES • If you remove the glowplug from the engine • This engine was designed for model aircraft. Do not attempt to use it for any other purpose. and check its condition by connecting the battery leads to it, do not hold the plug with bare fingers.Use an appropriate tool or a folded piece of cloth. • Mount the engine in your model securely, following the manufacturers' recommendations, using appropriate screws and locknuts.
NOTES • Always check the tightness of the propeller • Discard any propeller which has become nut and retighten it, if necessary, before restarting the engine, particularly in the case of four-stroke-cycle engines. If a safety locknut assembly is provided with your engine, always use it. This will prevent the propeller from flying off in the event of a "backfire", even if it loosens. • split, cracked, nicked or otherwise rendered unsafe. Never attempt to repair such a propeller: destroy it.
NOTES • Adjust the throttle linkage so that the engine • For their safety, keep all onlookers (especially small children) well back (at least 20 feet or 6 meters) 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. Keep the propeller pointed away from you and walk well clear of spectators. stops when the throttle stick and trim lever on the transmitter are fully retarded.
BASIC ENGINE PARTS INTRODUCTION Having pioneered the development of fourstroke cycle model aircraft engines in 1976, O.S. has maintained a continuing program of technological advancement, examples of which, would include the line of beautiful multi-cylinder engines, with many new engine designs continually under development. One of the latter is this new FS52S model.
How to fasten the mounting screws. INSTALLATION Installation in the model A typical method of beam mounting is shown below,left. Tighten second nut firmly down onto first nut. O.S. radial motor mount (Available as an optional extra part. See parts list) 3.5mm steel nuts Spring washer or lock washer 15mm min. 15mm min. Rigid hardwood (e.g. maple) Side view Steel washer Hardwood mounting beams Make sure that the mounting beams are parallel and that their top surfaces are in the same plane.
EXHAUST HEADER PIPE & SILENCER THROTTLE LINKAGE Fit these in the following sequence. Screw the header pipe into the cylinder head until it bottoms, then unscrew sufficiently to achieve the desired exhaust angle and tighten the locknut securely with a 14mm wrench. Screw the silencer onto the outer end of the header pipe and tighten the second locknut.
PROPELLERS FUEL 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 a starting point, refer to the props listed in the accompanying table. Slightly larger, or even slightly smaller, props than those shown in the table may be used, but remember that propeller noise will increase if the blade tip velocity is increased or a larger-diameter / smallerpitch prop used.
Glowplug life Model engine fuel is also highly flammable. Keep it away from open flame, excessive heat, sources of sparks, or anything else which might ignite it. Particularly in the case of very high performance engines, glowplugs must be regarded as expendable However, plug life can be extended and engine performance maintained by careful use, i.e.: GLOWPLUG • Install a plug suitable for the engine. • Use fuel containing a moderate percentage The FS-52S is supplied with an O.S.
FUEL AND PRESSURE LINES PROPELLER & SPINNER ATTACHMENT Connect suitable lengths of silicone tubing, as illustrated, after installing the engine. There is a risk, particularly with powerful four-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. Attention to tank height Muffler to tank pressure line Fuel level Obviously, this can be very hazardous.
TYPE 40N CARBURETTOR Intake pipe retaining screws Two adjustable controls are provided on this carburettor. They are as follows: Fuel Inlet • The Needle Valve This is used to establish the fuel/air mixture strength required for full power when the throttle is fully open. Rotor Guide screw Carburetor retaining screw Idle Mixture Control Valve • The Idle Mixture Control Screw This is used to establish the mixture strength required for steady idling and a smooth transition to medium speeds.
5. Close the throttle-arm to within 15-20°of the fully closed position and slowly turn the prop "backwards" (clockwise) by hand approximately 1.5 turns until it is arrested by Open compression.This is to enable Close 1/4 Starting position the kinetic energy of the prop to subsequently assist the starter through the compression stroke to start the engine. STARTING The FS-52S is not fitted with a manual choke control, since it has been designed for use with an electric starter only.
The recommended procedure is as follows : 1. Start and adjust the engine as detailed in the starting instructions. 8. Now disconnect current to the glowplug and gradually close the needle-valve so that the rpm increases. Make adjustments to the needle in small steps. Abrupt changes at this stage are likely to cause the engine to stall. Restart the engine by simply applying the starter with the glowplug reenergized and the throttle at its starting setting. 2.
5. Following the initial running-in session, check for any looseness in the installation due to vibration, then allow the engine a period of moderately rich operation in flight. Therefore, at this time ,the aircraft should, as far as is possible, be flown at an altitude sufficient to enable an emergency landing to be safely made if the engine stops. 6.
4. On the other hand, if the engine hesitates before picking up speed or even ceases firing completely, the idling mixture is likely to be too lean. Turn the mixture control valve 90° counter-clockwise to substantially richen the mixture, then back again 45° clockwise. First rotate the Mixture Control Valve until its slotted head is flush with the carburettor body. 5. In paragraphs 3 and 4 above, the 45° total movements are, of course, approximate.
The kit comes in a plastic case and includes: (Code No.72200060) 3. The standard valve clearance, on both inlet and exhaust valves, is between 0.04mm and 0.10mm(0.0015-0.004 inch), measured between valve stem and rocker arm. Use the 0.04mm and 0.10mm feeler gauges to check clearances. (See Fig.1.) • Feeler gauge 0.04mm • Feeler gauge 0.1mm • Hex. key 1.5mm • Wrench 5mm Note: If the gap is found to be less than 0.
(2) If a clearance is found to be outside either of 3. Insert 0.04mm feeler gauge between valve stem and rocker-arm and gently turn adjusting screw clockwise until it stops.(Fig.4.) these limits, it should be reset as follows. 1. Carefully loosen the locknut on rocker-arm 1/4-1/2 turn with 5mm wrench. (Fig.2.) Turn with fingers until it stops. Locknut 0.04mm Feeler Gauge Slacken approx. 1/4 to 1/2 turn. Wrench Fig.4 Fig.2 2. Turn adjusting-screw approx.
5. Remove 0.04mm feeler, rotate prop through two revolutions and recheck gap. Do not forget to clean the fuel filters periodically and, from time to time, unscrew the complete needle-valve assembly from the carburettor and remove any foreign matter that has accumulated in this area. (See photo.) If these precautions are neglected, restriction of fuel flow may cause the engine to cut out, or the fuel/air mixture to become too lean, causing the engine to overheat.
of contaminants as much as possible. Do not leave unused fuel in the engine at the conclusion of a day's flying. Accepted practice is to cut off the fuel supply while the engine is still running - at full throttle - then, to eliminate as much residue as possible rotate the engine for 5-10 seconds with the electric starter. Finally, inject some after-run oil through the glowplug hole and turn the engine over several times by hand.
ENGINE EXPLODED VIEW C.M2.6X12 2 C.M3X18 5-3 5-4 5-2 3-2 3 (C.M3X12) 3-1 1-1 1 1-2 6-4 6-3 6-2 5 6 9 5-1 0-1 C.M2.6X7 22 7-1 N.+M2.6X19 1 - 0-2 = 0 q ] \-2 \-1 \-2 a w e s C.M3X8 o t r ✽ 8 6-1 7 Type of screw d-1 y u i d \ f p o [ C.M2.
PARTS LIST 23 No. Code No.
CARBURETOR EXPLODED VIEW & PARTS LIST No. Code No. 7 6 8 9 5 9-1 N.+M3X6 0-2 0-1 0-3 1 4-1 2 4-2 0 3 ✽ 1-1 2 2081 313 2 4 4281 200 3 4 4281 960 4 4 4281 600 4-2 2 4881 824 S.
PARTS & ACCESSORIES ■ Radial Mount Set ■ O.S.Glow Plug ■ Flexible Exhaust Pipes (71913000) ■ Exhaust Header Pipe 52S(IN-COWL) TYPE F (72108400) (71615009) Code.No.
THREE VIEW DRAWING Dimension(mm) Specification ■ ■ ■ ■ ■ ■ Displacement Bore Stroke Practical R.P.M. Power output Weight 8.56cc (0.523cu.in.) 23.0mm (0.906in.) 20.6mm (0.811in.) 2,300 ~13,000r.p.m. 0.9bhp/12,000r.p.m. 434g (15.31oz.
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 2000 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan.
