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  5. Owner's Instruction Manual

O.S. Engine 15LA-S Owner's Instruction Manual

Manual is about: LA-S Series

Summary of 15LA-S

  • Page 1

    It is of vital importance, before attempting to operate your engine, to read the general 'safety instructions and warnings' section on pages 2-6 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 famil...

  • Page 2: Contents

    Contents safety instructions and warnings about your o.S. Engine introduction installation of the engine installation of silencer needle-valve location before starting plumbing and fuel tank position advice on selection of fuel, glow plug & propeller starting the engine running-in (breaking-in) trou...

  • 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 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. Never operate your engine in an en- closed space. Model engines, like auto- mobile engines, exhaust deadly carbon- mon...

  • Page 5: Notes

    Notes • • • • • this engine was designed for model aircraft. Do not attempt to use it for any other purpose. Mount the engine in your model securely, following the manufacturers' recommenda- tions, using appropriate screws and lock- nuts. Be sure to use the silencer (muffler) supplied with the engin...

  • Page 6: Notes

    Notes • • always check the tightness of the propeller 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 ...

  • Page 7: Notes

    Notes • • • • • adjust the throttle linkage so that the engine stops when the throttle stick and trim lever on the transmitter are fully retarded. Alternatively, the engine may be stopped by cutting off the fuel supply. Never try to stop the engine physically. Take care that loose clothing (ties, sh...

  • Page 8: Introduction

    Introduction the "la-s series" engines are designed for control line models. They have broad power characteristics which are suitable for both trainer models and stunt models. A separate needle-valve is mounted at the rear, where manual adjustment is safely away from the rotating propeller. The 'mid...

  • Page 9: Installation

    Installation how to fasten the mounting screws. Hardwood mounting beams o.S. Radial motor mount (cast aluminum) tighten second nut firmly down onto first nut. Tighten this nut first. Steel washer 3mm steel screw spring washer or lock washer hardwood such as cherry or maple. Spring washer 3mm steel a...

  • Page 10: Installation of Silencer

    Needle-valve extension the needle-valve supplied with these engines is designed to incorporate an extension so that, when the engine is enclosed within the fuselage, the needle-valve may be adjusted from the outside. Cut a commercially available rod to the required length, bend one end to an l shape...

  • Page 11: Before Starting

    Finally, secure the complete assembly to rear cover plate as before. 3. As self-tapping screws are used for unit attachment, screw them in carefully so that screw threads match those of the unit body precisely. Note: remove the two cover-plate screws which secure the needle-valve assembly bracket, t...

  • Page 12

    Resistance coil (nichrome wire) adjust applied voltage by changing the position of clip on resistance coil until glowplug element is glowing bright red. Battery leads raise voltage to increase brightness. Lower voltage to reduce brightness. Warning (very hot) 5 plug wrench used for tightening glowpl...

  • Page 13

    Make sure that there are no kinks or folds in the plumbing. Silicone tubing use knife or razor blade. Do not use wire cutters or pliers note: when cutting silicone tubing...... *if you should need to clean out silicone tubes, use methanol or glow-fuel, not gasoline. Note: control line models tend to...

  • Page 14

    A b 75% 20% 5% 65% 20% 10% methanol castor oil nitromethane 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 engine fuel is also highly flammable. Keep it away from open ...

  • Page 15: Starting The Engine

    Install a plug suitable for the engine. Use fuel containing a moderate percentage of nitromethane unless more is essential for racing events. 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 ma...

  • Page 16

    Warning: when using a spinner assembly, make sure that the notches in the spinner shell are large enough to clear the propeller blades and so do not cut into and weaken the blade roots. Tighten the spinner nut firmly so that compression is first felt as indicated (i.E. With blades horizontal) when t...

  • Page 17

    Fuel inlet fuel tube fuel will flow from tank to venturi as propeller is turned. Place your finger over the venturi to choke intake. Turn the propeller two revolutions while watching the fuel line. 6 priming 7 hold model securely when starting starter assistant assistant should hold the model so tha...

  • Page 18

    9 apply electric starter bring the starter into contact with the spinner nut or spinner and depress the starter switch for one or two seconds. Repeat if necessary. When the engine fires, withdraw the starter immediately. Attention: never place your finger over the carburettor intake when applying th...

  • Page 19

    Listen to the sound carefully. 11 needle-valve adjustment(1) then gradually close the needle-valve until the exhaust sound changes from an irregular pitch (four-cycle) to a steady pitch (two-cycle). Close the needlevalve gradually until the engine sound is changing from a four-cycle into a two- cycl...

  • Page 20

    14 needle-valve adjustment(summary) practical best(optimum) needle-valve setting exhaust note starts to change. Disconnect battery leads from glowplug at about this point. Clear, high-pitched two-stroke exhaust note maximum rpm setting("lean"). "rich" needle-valve setting when starting the engine. T...

  • Page 21: Running-In ("breaking-In")

    Once the optimum needle-valve setting has been established (see "needle-valve adjustment- summary") the procedure for starting is simplified as follows: 1) open the needle-valve one half-turn (180˚) from the optimum setting. 2) energize the glowplug and apply the starter. When the engine starts, re-...

  • Page 22

    1 2 3 symptom factor cause corrective action recharge the electric starter battery. Recharge lead-acid cell or replace dry battery. (note: an unused, or almost unused, dry battery may sometimes be of insufficient capacity if it is "old stock".) replace glowplug. Check that applied voltage is not too...

  • Page 23

    Symptom factor cause corrective action 2 3 1 2 3 3 3 3 2 voltage too high or too low. Re-check and readjust referring to "before starting" paragraph 4. Continue flipping propeller. If engine does not start after more than 10 flips, disconnect battery from glowplug and leave for a few minutes, then r...

  • Page 24: Care and Maintenance

    Care and maintenance to ensure that you obtain long life and peak performance from your engine, observe the following. Avoid running the engine under dusty conditions. If necessary, lay a sheet of plywood or hard-board in front and under the nose of the model when starting the engine. Foreign matter...

  • Page 25: Exploded View

    W q = - 0 5 4 3 1 2 q -3 q -5 q -4 q -2 q -1 n.+m3x12(25la-s) m3.5 b.M2.6x8 s.3x3 m.M2.6x10(15la-s) 9 8 7 6 e exploded view (max -15/25la-s) type of screw c … cap screw m … oval fillister-head screw f … flat head screw n … round head screw s … set screw 24 ✽.

  • Page 26: Engine  Parts  List

    Engine parts list (max -15/25la-s) specifications are subject to alteration for improvement without notice. 15la-s 25la-s 1 2 3 4 5 6 7 8 9 0 - = q q -1 q -2 q -3 q -4 q -5 w e 22563000 24081970 22557100 22557000 22564000 22302000 22551000 22020001 22558000 24009000 23210007 21381980 22405013 226060...

  • Page 27: Exploded View

    5 4 3 2 1 9 7 6 8 - 0 = w q r -1 r -2 r -3 r -4 r -5 r -6 n.+m3x8 n.+m3x12 s.3x3 e r t m3.5 type of screw c … cap screw m … oval fillister-head screw f … flat head screw n … round head screw s … set screw exploded view (max -40/46la-s) ✽ 26.

  • Page 28: Engine  Parts  List

    Engine parts list (max -40/46la-s) specifications are subject to alteration for improvement without notice. 40la-s 46la-s 1 2 3 4 5 6 7 8 9 0 - = q w e r r -1 r -2 r -3 r -4 r -5 r -6 t 24004000 24004100 24003010 24003100 23356000 45806000 24005000 23312000 23210007 24009000 24008000 22020001 240010...

  • Page 29

    4.07 cc (0.249 cu.In.) 18.0mm (0.709 in.) 16.0mm (0.630 in.) 2,000 ~ 16,000 r.P.M. 0.6 bhp / 15,000 r.P.M. 185.5g (6.54 oz.) ■ ■ ■ ■ ■ ■ 2.49 cc (0.1517 cu.In.) 15.2mm (0.598 in.) 13.7mm (0.539 in.) 2,500 ~ 18,000 r.P.M. 0.41 bhp / 17,000 r.P.M. 129.5g (4.56 oz.) ■ ■ ■ ■ ■ ■ max-15/25la-s three view...

  • Page 30

    6.49 cc (0.396cu.In.) 21.2 mm (0.835in.) 18.4 mm (0.724in.) 2,000 ~ 16,000 r.P.M. 1.0 bhp / 15,000 r.P.M. 267.5g (9.43oz.) ■ ■ ■ ■ ■ ■ 7.64 cc (0.467cu.In.) 23.0 mm (0.906in.) 18.4 mm (0.724in.) 2,000 ~ 16,000 r.P.M. 1.2 bhp / 15,000 r.P.M. 263.5g (9.29oz.) ■ ■ ■ ■ ■ ■ max-40/46la-s three view drawi...

  • Page 31

    O.S. Genuine parts & accessories ■ radial motor mount (71909310) for 15la-s (71908100) for 25la-s (71906200) for 40,46la-s / "-28 (21125108) for 15la-s (22325100) for 25la-s (23325100) for 40,46la-s (23024008) for 25la-s ■ super silencer ■ spinner nut ■ long propeller nut set ■ bubbless weight ■ sup...

  • Page 32

    C copyright 2000 by o.S.Engines mfg. Co., ltd. All rights reserved. Printed in japan. Un eq ua lle d qu ality precision & perfo rma nc e est ablish ing the standards of ex cel len ce 110100 tel. (06) 6702-0225 fax. (06) 6704-2722 6-15 3-chome imagawa higashisumiyoshi-ku osaka 546-0003, japan url : h...