ROTARY ENGINE 49PI 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. ENGINE 2~6 PRE-FLIGHT CHECKING SUBSEQUENT READJUSTMENT 16 INTRODUCTION 7 ENGINE CARE AND MAINTENANCE 17 BASIC ENGINE PARTS 8 GENUINE 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.
within a housing having an epitrochoidal bore i.e. a wide-waisted figure-of-eight shape.Planetary rotation is controlled by an eccentric shaft, an internally-toothed gear and a fixed pinion mounted centrally on the rear cover plate. The tips of the rotor are in continuous contact with the housing, forming three chambers, each of which changes in volume, with rotation, to effect suction, compression, expansion and exhaust phases, as in a four-stroke reciprocating engine.
Installing the glowplug BASIC ENGINE PARTS Rotor Housing Carefully insert plug, with washer, fingertight only, before final tightening with the correct size plug wrench.
Glowplug life GLOWPLUG 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.: Install a plug suitable for the engine. (i.e. O.S. Type RE) 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. A specially designed O.S.
MOUNTING THE ENGINE Firmly bolt the engine's radial mounting flange to the model or to a rigid test stand, using selflocking nuts or secondary nuts locked to the first. Make sure that the three cap screws securing the mounting flange to the engine itself, are tight and are fitted with spring washers. The engine is normally mounted so that the carburettor is horizontal on the right side and the glowplug on the left ( i.e. when viewed from astern). The engine should receive a free flow of cooling air.
PROPELLER BEFORE STARTING The suitability of the prop depends on the size and weight of the model and type of flying. Determine the best size and type after the engine has been run in. Check the balance of the propeller before fitting it to the engine. Unbalanced propellers cause vibration and loss of power. Wooden propellers are to be preferred. Some nylon propellers are not strong enough to withstand the high power output of these engines and a thrown blade can be very dangerous.
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 (accumulator). Battery leads Battery leads These are used to conduct current from the battery to the glowplug. Basically, two leads, with clips, are required, but, for greater convenience, twin leads with special glowplug connectors, as shown on the right, are commercially available.
Fuel can filter Fit a filter to the outlet tube of your refuelling container to prevent entry of foreign matter into the fuel tank. Fuel Can Filter Silicone tubing This is required for the connection between the fuel tank and engine. Plug wrench Used for tightening glowplug. The O.S. long plug wrench is available as an optional accessory.
STARTING Now close the throttle to between one-quarter and one-third open, connect glowplug lead and apply electric starter. Fill the fuel tank and open the needle-valve 2-3 turns from the closed position. Prime the engine fairly liberally with fuel through the carburettor. Turn the propeller through one complete revolution and prime again. Repeat this procedure once more so that all three chambers, formed between the rotor flanks and housing, are primed.
RUNNING-IN ("Breaking-in") For running-in, fit the engine with a well-balanced propeller intended for actual flight. Use a fuel mixture as specified. Running-in procedure is the same as for a conventional reciprocating model engine. After starting the motor, open the throttle fully, but use a rich needlevalve setting to reduce rpm, increase lubrication and lower running temperature.
PRE-FLIGHT CHECKING SUBSEQUENT READJUSTMENT Prior to releasing your model for take-off, carefully check that the engine continues to run steadily in all flight attitudes: this includes holding the model with the nose pointing vertically upwards. In that attitude (assuming the model to be equipped with a stunt type fuel-tank) the engine must not quit: if it does, the mixture is set too lean. Open the needle-valve until the engine runs safely in this attitude.
ENGINE CARE AND MAINTENANCE 1. At the end of each operating session, drain out any fuel that may remain in the fuel tank. 2. Next, energize the glowplug and try to restart the engine to burn off any fuel that may remain inside the engine. Repeat this procedure until the engine fails to fire. Remove the glowplug and eject any residue by rotating the engine with an electric starter for 4 to 5 seconds while the engine is still warm. 3. Finally, inject some after-run oil into the engine.
O.S.
THREE VIEW DRAWING Dimensions(mm) SPECIFICATIONS ■ Displacement ■ Bore ■ Stroke ■ Practical R.P.M. ■ Power output ■ Weight 4.97 cc (0.303cu.in.) 2,500~18,000 r.p.m. 1.27bhp / 17,000 r.p.m. 335g (11.8oz.
EXPLODED VIEW N.+3.5✕5 C.M2.6✕8.6 ] C.M2.6✕8 M.+3✕24 M.+3✕24 ] -1 o C.M2.6✕5 [ C.M3✕10 p M.+3✕23(9pcs.
ENGINEN PARTS LIST Description No. Code No. 1 23024008 Spinner Nut 2 41612000 Drive Hub 2-1 41826005 Description No. Code No. q 41635010 Silencer 49-PI Assembly q-1 23081706 Woodruff Key Silence Retaining Screw w 71614001 Glow Plug Type RE 3 41625000 Shaft Spacer e 41830000 Housing Assembly Tubular Dowels(2pcs.) 4 41822000 Housing Assembly Screw Set r 41603000 Rear Housing 5 41601000 Front Housing t 22681953 Nipple No.
CARBURETOR EXPLODED VIEW & PARTS LIST Description No. Code No. N.+3✕6 1 41618400 Throttle Lever 1-1 22081313 N.+3.
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 2001 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan.