O.S.ENGINES 50SX-H Manual
Contents
1. Sanem max 50SX Hrinc HYPER OWNER S INSTRUCTION MANUAL 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 e Also please study the entire contents of this instruction manual so as to familiarize yourself with the controls and other features of the engine e Keep these instructions in a safe place so that you may readily refer to them whenever necessary e lt is suggested that any instructions supplied with the model radio control equipment etc are accessible for checking at the same time CONTENTS SAFETY INSTRUCTIONS AND ADJUSTMENT 0000300 21 23 WARNINGS ABOUT YOUR O S ENGINE 2 5 SUBSEQUENT READJUSTMENTS NOTES ON INSTALLING CARBURETOR CLEANLINESS 24 COOLING FAN AND CLUTCH 3s 6 ADJUSTMENT CHART 25 NOTES WHEN APPLYING AN ELECTRIC STARTER NOTES ON HEATING THE GLOW PLUG 0777 7 8 INSTALLATION OF THROTTLE SERVO 26 INTRODUCTION BEFORE STARTING 9 12 CARE AND MAINTENANCE 27 ENGINE PARTS NAME TROUBLE SHOOTING crete 28 81 FACTS ABOUT GLOWPLUGS 13 14 ENGINE EXPLODED VIEW amp PARTS LIST 32 33 INSTALOING THE ower CARBURETOR EXPLODED VIEW amp PARTS LIST 34 35 INSTALLATION OF THE CARBURETOR 15 36 INSTALLATION OF THE ENGINE O S GENUINE PARTS amp ACCESSORIES CARBURETOR CONTROLS 15 18 THREE VIEW DRAWING 37 STARTING RUNNING IN2. lubricant by volume Some fuels AR containing coloring additives tend to Ke deterriorate and may adversely affect T running qualities If in doubt compare to a fuel known to be good Reminder L 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 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 E TOOLS Hex Wrench Necessary for engine installation 1 5mm 2mm 2 5mm 3mm O ys YY Phillips Screwdriver No 1 No 2 etc z eet 3 Screwdriver Necessary for carburetor adjustments No 1 No 2 etc Sf Socket Wrenches 5mm 5 5mm 7mm ia LONG SOCKET WRENCH WITH PLUG GRIP Recommended for easy removal and replacement of the angled and recessed glowplug the O S Long Socket Wrench incorporates a special grip 8mm H ag End Wrenches 8mm 13mm 14mm etc I Needle Nose Pliers 12 ENGINE PARTS NAME Heatsink Head Glowplug Carburetor Typr 60LH No 1 Needle Valve Mixture Control Screw Mixture Control Valve Stopper Crankshaft 13 FACTS ABOUT GLOWPLUGS Since the compatibility of glowplug and fuel may h
3. Breaking in 18 20 MEMO r ER tees 99 SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O S ENGINE 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 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 W The advice which follows is grouped under two headings according to the degree of damage or danger which might arise through misuse or neglect These cover events which These cover the many other might involve serious in possibilities generally less obvious extreme circumstances even sources of danger but which under fatal injury certain circumstances may also cause damage or injury e Never touch or allow any e Never operate your engine in an en object to come into contact closed space Model engines like auto with the rotating parts mobile engines exhaust deadly carbon monoxide Run your engine only in an p open area e Model engine fuel is poison ous Do not allow itto come e Model engines generate into contact with the eyes or consid rable heat Do net mouth Always store it in a Shs Fouch t i clearly marked container and ouch any part of your out of
4. Hovering OK OO 4 Turn the Needle Valve t 2 or 3 clicks clockwise Adjustment completed or turn the Mixture Control Screw 1 3 degrees clockwise Adjust pitch control characteristics INSTALLATION OF THROTTLE SERVO After the engine is installed in the helicopter please observe the following recommendations when linking the throttle servo to the carburetor Locate the servo so that its output arm and the throttle pushrod are as close as possible direct ly in line with carburetor s throttle arm as shown CARE AND MAINTENANCE 1 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 problem One of these filters installed on the outlet tube inside 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 3 At the end of each operating session drain out any fuel that may remain in the fuel tank N
5. Gasket 11 23818190 Carburetor Sealing Washer The specifications are subject to alteration for improvement without notice 35 O S GENUINE PARTS amp ACCESSORIES Em GLOWPLUG m DRIVE HUB ASSEMBLY IN FLIGHT CONTROL WE SUPER FILTER No 8 w woodruff key NEEDLE VALVE L 72403050 71608001 71705000 e Drive Hub 27708010 A3 Woodruff Key 71605300 27708200 Z A5 71605100 O ECRANKSHAFT CLAMP m LONG SOCKET WRENCH E LOCK WASHER E CAP SCREW SET 3246 71530400 WITH PLUG GRIP 10set M2 6x18 10pcs 71521000 M3 55500002 79871055 FERR i The specifications are subject to alteration for improvement without notice 36 THREE VIEW DRAWING Dimensions mm 17 5 SPECIFICATIONS E Displacement 8 17 cc 0 499 cuin H Bore 22 0mm 0 866 in E Stroke 21 5mm 0 847 in S p zt W Practical R P M 2 000 20 000 r p m amp E Power output 1 9 ps 17 000 r p m E Weight 406g 14 33 oz 31 51 6 38 47 54 Z 37 T s q z ISDE Si UNF1 4 28 O 4 SR J p S f i a 60 7 25 NOTE Please note that this engine is not supplied with Drive Hub 37 MEMO 38 TY PRECISION que E pe QY A O S ENGINES wr co cro 6 15 3 Chome Imagawa Higashisumiyoshi ku Osa
6. No 71530400 available as an optional tool It is made of durable engineering plastic and locks the crankshaft without risk of damage to any part of the engine Notes on installing cooling fan and clutch Application is as follows e Remove the crankcase rear cover plate from the engine and rotate the crankshaft to the bottom dead center BDC position e Insert the crankshaft clamp so that its grooved portion surrounds the crankpin and lower end of the connecting rod and securely tighten the fan or clutch onto the crankshaft BDC position Rotate the crankshaft so that the connecting rod comes to this position Insert this groove onto the connecting rod NOTES WHEN APPLYING AN ELECTRIC STARTER Because of this 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 over prime This could cause hydraulic lock and damage the engine on application of the electric starter If over primed remove glowplug close needle valve and apply starter to pump out surplus fuel Cover the head with a rag to prevent pumped out fuel from getting into your eyes NOTE As delivered the engine has the carburetor lightly fit into the intake Secure it changing the angle according to the model INTRODUCTION This is the increased power version of the 5
7. before re tightening screw 2 Rotate the retainer screw gently until it stops then tighten a further 90 120 degrees Do not over tighten the screw as this will damage the carburetor body 14 15 However plug life can be extended and engine performance maintained by careful use i e e Install a plug suitable for the engine eUse 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 When to replace the glowplug Apart from when actually burned out a plug may need to be replaced because it no longer delivers its best performance such as when e Filament surface has roughened and turned white Filament coil has become distorted e Foreign matter has adhered to filament or plug body has corroded e Engine tends to cut out when idling Starting qualities deteriorate Carburetor Rubber Gasket US T Retainer screw 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 If they are not they will cause stress and distortion within the engine itself probably resulting in loss of performance and internal damage The recommended screws for securing the engine to the engine mounts in the m
8. mediately 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 Reminder Never touch or allow any object to J come into contact with the rotating rotor 20 RUNNING IN Breaking in All internal combustion engines benefit to some degree from extra care when they are run for the first few timesq own as running in or breaking in This is allows the working parts to mate together under load at operating temperature However because O S engines are made with the aid of the finest modern precision machinely and from the best and most suitable materrials only a very short and simple running in procedure is required and can be carried out with the engine installed in the modle 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 response and cause the engine to stope About 1 5 turn open from the nomal setting will usually suffice ADJUSTMENT The following adjustments are approximately correct when using a fuel containing 18 25 lubricant and 10 30 nitromethane Bear in mind that fuels containing relatively large percentages of power boosting nitromethane operate at richer mixture settings than are needed for mild fuels and will therefore require the Needle Valve to be readjusted accordingly The type
9. the reach of children engine until it has cooled Contact with the muffler silencer cylinder head or exhaust header pipe in particular may result in a serious burn e 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 orallowanyoneelse to smoke near to it 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 exposure to a noisy exhaust especially in the case of the more powerful high speed engines may eventually impair your hearing and such noise is also likely to cause annoyance to others over a wide area Check the linkage to the throttle arm before each flight Avoid sudden high r p m immediately after the engine is started as the clutch will engage and you may be struck by the rotor e 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 especially small children well back at least 20 feet or 6 metres when preparing your model for flight I
10. 0 Carburetor Retainer Assembly 13 25201000 Crankcase 14 26730010 Crankshaft Bearing Rear 15 25202000 Crankshaft 16 25214000 Gasket Set 17 25207000 Cover Plate 18 25613000 Screw Set Ry low Plug No C M2 6x18 71608001 Glow Plug No 8 q The specifications are subject to alteration for improvement without notice O pe of screw C Cap Screw M Oval Fillister Head Screw F Flat Head Screw N Round Head Screw S Set Screw CARBURETOR EXPLODED VIEW O pe of screw C Cap Screw M Oval Fillister Head Screw 3 F Flat Head Screw N Round Head Screw S Set Screw CARBURETOR PARTS LIST No Code No Description 1 27381410 Throttle Lever Assembly 1 1 22826131 Throttle Lever Retaining Screw 2 29083200 Carburetor Rotor 3 29083600 Mixture Control Valve Assembly 3 1 27881810 O Ring L 2pcs 3 2 27881800 O Ring S 2pcs 3 3 27881820 O Ring L 2pcs 4 45581820 Rotor Guide Screw 5 29083110 Carburetor Body 6 22681953 Fuel Inlet No 1 7 27881330 Mixture Control Screw 8 9 27681340 Mixture Control Valve Stopper Assembly 27981900 Needle Valve Assembly 9 1 27981910 Needle Assembly 9 2 24981837 O Ring 2pcs 9 3 127381940 Needle Valve Holder Assembly 9 4 26711305 Ratchet Spring 10 29015019 Carburetor Rubber
11. 0SX H RING whis is developed expressly for F3C M class helicopter competition utilizing 0 50 cubic inch engines Blue Alumite heatsink head increases cooling capacity Newly designed combustion chamber shape offers stable output both at hovering and high speed The 60LH caburetor has a big 10mm bore which contributes the power increase STANDARD ACCESSOIES Glow Plug No 8 3 Instruction manual Note on heating the glow plug The heatsink head on the engine is treated with Alumite which does not conduct current Therefore when heating a glow plug connect one lead to the glow plug and the other to the head of cover plate retaining screw Example BEFORE STARTING Tools accessories etc The following items are necessary for operating the engine E Items necessary for starting Glow Plug O S No 8 is supplied with the engine Battery leads These are used to conduct current from the battery to the glowplug Basically two leads with clips are required but for greater conve nience twin leads with special glowplug connectors as shown on the right are commercially available Battery leads Glowplug battery The power source for heating the glowplug may be either a large heavy duty 1 5volt dry cell Ni cd battery or glowplug Igniter glowplug Igniter 1 5 volt dry cell In case of 1 5volt dry cell Make sure glowplug element glows bright red inside room or shad
12. and percentage of lubricant used is also a factor here as noted later in these instructions This carburetor is not equipped with a throttle stop screw Instead idle speed is adjusted by means of the throttle trim lever on the trans mitter This enables the full r p m range from idle 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 21 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 engine stopped when the stick is fully retarded The idle speed is then set by advancing the throttle trim lever to the point where the engine runs steadily and reliably at the desired idle speed As a safety measure first check the transmitter controls including the throttle stick and trim lever positions and hold the main rotor securely before starting the engine Warm the engine by allowing it to idle for about 30 seconds If the engine stops advance the throttle trim lever slightly to increase the idle rpm Then open the throttle sufficiently to float the model above the ground If at this time the engine is slow to pick up and produces an excess of exhaust smoke the mixture is too rich Cor
13. ave 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 Carefully install plug finger tight before final tightening with the correct size plug wrench The role of the glowplug With a glowplug engine ignition is initiated by the application of a 1 5 volt power source When the battery is disconnected the heat retained within the combustion chamber remains sufficient to keep the plug filament glowing thereby continuing to keep the engine running Ignition timing is automatic under reduced load allowing higher rpm the plug becomes hotter and appropriately fires the fuel air charge earlier conversely at reduced rpm the plug become cooler and ignition is retarded Glowplug life Particularly in the case of very high performance engines glowplugs must be regarded as expendable items INSTALLING THE GLOWPLUG Install washer on glowplug and insert carefully into Heatsink head making sure that it is not cross threaded before tightening firmly y Glow plug Washer 3 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
14. eed Use the same fuel as you intend to employ for actual operation of your model 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 2 Opening the needle valve Firstly turn the needle clockwise slowly until it stops The position it stops is the fully closed position of the needle valve Make note this Open the needle valve 1 5 turns 3 Preparation of the starter Install the starting shaft to the starter securely Poor installation will allow the shaft to swing which can be dangerous position for reference f 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 In case the engine does not stop Hold the rotor head and pinch the silicone tube to stop the fuel supply If it still does not stop pull off the fuel tubing from the carburetor It is necessary to readjust the throttle linkage so that the carburetor rotor is fully closed when the throttle stick and throttle trim on the transmitter are fully pulled Down NOTE If the throttle response is poor or the engine stops due to a temporarily over rich mixture im
15. ext energize the glowplug and try ot 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 remaining fuel oil residue by rotating the engine with an electric starter for 4 to 5 seconds while the engine is still warm Servo output arm Throttle control rod A and B should be equal of length Set the linkage so that the servo output arm and throttle arm become parallel when the throttle stick on the trans mitter is at middle position If differential throttle move ment is required make necessary adjustment at the transmitter 26 4 Finally injectsomeafter runoilintothe engine Rotate the engine a few times by hand to make sure that it is free and then with an electric starter for 4 to 5 seconds to distribute the oil to all the working parts Note Do not inject after run oil into the carburetor as this may cause the O rings inside the carburettor to deteriorate These procedures will reduce the risk of starting difficulties and of internal corrosion after a period of storage 27 TROUBLE SHOOTING Engine fails to fire Cause Corrective action Fuel tank is empty Fuel not reaching the engine Fill the tank with fuel and repeat Priming procedure Glowplug element is burnt out Glowplug battery discharged Replace glowplug Recharge or replace the battery Clogged fuel filter S
16. f you have to carry the model to the take off point with the engine running be especially cautious Hold the rotor securely and keep well clear of spectators Warning Immediately after a glowplug ignition engine has been run and is still warm conditions sometimes exist whereby it is just possible for the engine to restart when turned over WITHOUT the glowplug battery being reconnected Remember this if you wish to avoid the risk of accidents e After starting the engine carry out any needle 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 e Use an electric starter The wearing of safety glasses is also strongly recommended Press the rotor head down securely e Take care that the glow plug clip or battery leads do not come into contact with rotating parts e 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 Do not use a tool which locks piston when installing a cooling fan and clutch or top of the piston may be damaged Also do not insert a screw driver or p a3 the similar into the Kee Z exhaust port A SA D It is recommended to use Crankshaft Clamp 3246 Code
17. he Needle Valve opening by an extra half turn counter clockwise prior to establishing a new setting The same applies if the silencer type is changed A different silencer may alter the exhaust pressure applied to the fuel feed and call for a revised Needle Valve setting The use of a different glowplug or changes to the mainrotor and its pitch angles may also require compensating carburetor readjustments 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 and unreliable It is recommended that fuel be passed through a filter when the tank is filled and that a good in line filter is installed between the fuel tank and carburetor and furthermore that this filter is frequently cleaned to remove dirt and lint that accumulates on the filter screen Finally occasionally remove the needle valve holder from the carburetor as shown in Photo and extract any remaining foreign matter that may have lodged in the location shown in right Dirt and fbrous matter Remove this with mostly accumulate here an 8mm spanner Ge ADJUSTING CHART Open the Needle Valve 1 5 turns from the fully closed position Make sure that the Mixture Control Valve is at the factory set
18. he model is flying at full throttle If at full throttle acceleration is poor the Readjustments should therefore be carried out as follows If 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 clockwise If on the other hand the response to mid range throttle movement is too sensitive indicating a lean mid range mixture turn the Needle Valve 2 or 3 clicks counter clockwise or turn the Mixture Control Screw 1 3 degrees counter clockwise Q Throttle response at hovering speeds is also affected by the relationship of the main rotor pitch angle to throttle opening If the optimum mid range throttle response cannot be obtained by the carburettor adjustments described above try adjusting the helicopter s pitch control characteristics 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 conditions The use of a different fuel however particularly one containing more or less nitromethane and or a different type or proportion of lubricating oil is likely to call for some readjustment of the Needle Valve Remember that as a safety measure it is advisable to increase t
19. ilencer inside is dirty Clean or replace fuel filter Clean inside silencer Over priming Remove glowplug and pump excess fuel Fuel tubing is disconnected Fuel tubing is kinked split or has a hole Connect fuel tubing securely Check the tubing carefully and replace if necessary Incorrect carburetor settings Return the needle valve and mixture control valve to basic position Incorrect servo linkage Re linkage after setting servo at neutral Reverse rotating direction of electric starter Mare sure it rotates counter clockwise seen from crankshaft side 28 Engine fires intermittently but does not run Cause Corrective action Insufficient fuel in the tank Fill the tank with fuel Deteriorated glowplug Replace glowplug Clogged fuel filter Silencer inside is dirty Clean or replace fuel filter Clean inside silencer Engine overheated Wait until engine is cooled Disconnecting plug battery too soon Do not disconnect plug battery and wait until r p m become stable Air bubbles in fuel Fit O rings to the tank screws to prevent bubbles 29 Unstable idle Cause Corrective action Unsuitable glowplug Use suggested glowplug in the instructions Unsuitable fuel Do not use extremely high nitro or low oil fuel Silencer is disconnected or has play Install silencer securely Not reaching ex
20. ka 546 0003 Japan TEL 06 6702 0225 FAX 06 6704 2722 URL http www os engines co jp Copyright 2004 by O S Engines Mfg Co Ltd All rights reserved Printed in Japan 60091510 010602
21. marks When the triangle mark on the carburetor rotor meets the most right mark throttle is fully closed When the triangle mark meets the top mark throttle is fully open The range is 86 degrees You may use other three marks as the reference marking of throttle opening to your preference when hovering WARNING Never try to check the triangle mark position while the engine is running and rotor is rotating or you may be hit by rotating rotor which results in serious injury Stop the engine and rotor before checking the triangle mark position Checking the rotating direction of the starter Make sure that the starter rotates in 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 glowplug open the throttle a little from the idle position Turn the engine using the starter until the fuel is seen to reach the carburetor dy SN Make sure that the transmitter throttle stick is at the fully closed position and the throttle trim at center position and make sure that idle up switch on the transmitter is off Hold the rotor head by hand so that rotor cannot rotate when the engine is Started Also steady the SA model with a foot on the landing gear skid 18 19 STARTING Be sure to use a muffler pressurized fuel f
22. odel are 3mm or 4 40 steel Allen type It is also advisable to use lock washers or LOCTITE to prevent nuts from loosening CORRECT Front view Side view Top surfaces are in the same plane INCORRECT x A 54 Top surfaces are not Top surfaces are not in in the same plane the same plane Engine does not rest firmly Re align the surfaces as necessary Make sure that only the under surfaces of the engine s mounting lugs are in contact with the engine mount Please note that crankcase volume of the 50SX H is a little larger than the 46FX H s If the crankcase body touches the mount chamfer the edges of the mount NOTE As the idle mixture control screw is installed with LOCTITE it may initially feel stiff and it is suggested to use a littli larger screwdriver The screw can be turned only 90 degrees either way Do not force to turn further or it may break or cause trouble 16 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 Two adjustable controls are provided on this carburetor e The Needle Valve When set to produce maximum power at full
23. ow Hexagon starting shaft This shaft mounted on an electric starting motor is driven into the shaft cup to turn the engine Electric starter and starter battery An electric starter is recom mended for starting Fuel Pump Alternatively one of the purpose made manual or electric fuel pumps may be used to transfer fuel directly from your fuel container to the fuel tank O S Super Filter Fuel Can Filter Install a filter to the outlet tube of your refueling container to prevent entry of foreign matter into fuel tank O S Super Filters large and small are available as optional extras Fuel Filter It is recommended to install a good in line filter between the fuel tank and carburetor to prevent entry of foreign matter into the carburetor Silicone Fuel Line Heatproof silicone tubing of approx 5mm o d and 2 5mm i d is required S for the connection between the fuel tank and engine Battery leads j 12V Battery Starter 11 10 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 a blend of both provided that they are always of top quality For consistent performance and long engine life it is essential to use fuel containing AT LEAST 18 Bes
24. pected peak r p m Cause Corrective action Insufficient warming up or running in Set the needle only after warming up Complete running in Silencer or manifold is not securely connected or disconnected Check the connections and secure them Fuel tubing from tank to is split or broken Replace the tubing Poor response Cause Corrective action Deteriorated glowplug Replace glowplug Incorrect carburetor settings Readjust low r p m range with metering needle and mixture control valve Inaccurate linkage Recheck the throttle opening against the pith angle Poor r p m drop Cause Corrective action Too much throttle opening at idle Lower the throttle trim to adequate position to lower idling r p m Incorrect carburetor fitting Fit carburetor securely Needle valve closed too far Open needle valve slightly ENGINE EXPLODED VIEW ENGINE PARTS LIST Tt AN r4 e Code No Description 25204200 Hyper Head 25203100 Cylinder Liner 25303400 _Piston Ring 25203200 Piston 25206000 Piston Pin 25217000 Piston Pin Retainer 2pcs 25205000 Connecting Rod 29083020 Carburetor Complete Type 60LH CO OO N O or AJ oo Po 23210007 ropeller Nut 10 46120000 Thrust Washer 11 26731002 Crankshaft Bearing Front ee D 2398170
25. rect this condition by turning the Mixture Control Screw clockwise If the mixture is extremely rich engine rpm will become unstable opening the throttle will produce a great deal of smoke and rpm may drop suddenly or the engine may stop This condition may also be initiated by an excessively prolonged warming up period If on the other hand the mixture is too lean this will be indicated by a marked lack of exhaust smoke and a tendency for the engine to cut out when the throttle is opened In this case turn the Mixture Control Screw counter clockwise to enrich the mixture Turn the Mixture Control Screw 5 degrees at a time Having provisionally set the idle mixture the next step is to adjust the mixture for hovering flight 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 If however after smoothly accelerating to satisfactory high speed straight and level flight power is lost when the model is pulled up into a climb the mixture is too lean In this case land the model immediately and readjust Needle Valve to a richer setting Now re check hovering performance and if necessary fine tune the mixture for hovering flight N For helicopters good throttle response at medium r p m e g hovering speeds is most important since this is a power range widely used in helicopter flight The optimum fuel air mixt
26. throttle this establishes the basic fuel air mixture strength This is then maintained by the carburetor s automatic mixture control system to cover the engine s requirements at reduced throttle settings eThe Mixture ControlScrew Mixture Control Valve For adjusting the mixture strength at part throttle and idling speeds to obtain steady idling and smooth acceleration to medium speeds The Mixture Control Valve has been factory set for the approximate best result First run the engine as received and re adjust the Mixture Control Valve only when necessary BASIC POSITION OF MIXTURE CONTROL SCREW Mixture Control Valve As delivered the Mixture Control Screw is positioned at approximately the center as shown in the sketch Mixture gets lean when the Mixture Control Screw is turned right while mixture gets rich when the Mixture Control Screw is turned left With a model helicopter adjustments vary with combined various factors such as climatic conditions fuel muffler main rotor weight of the model gear ratio etc Therefore Mixture Control Screw position varies with each model and set up and it is normal if the Mixture Control Screw position is off the center Thick a Mixture Control Screw Lean Mixture Control Valve 17 A g 2 N Preparation of starting Graduations on the carburetor body Carburetor Body As shown in the sketch the carburetor has graduation
27. ting t Start the engine t Warm up the engine t Observe the mixture condition while floating the model __ Ln Le Lean mixture Rich mixture Turn the Mixture Turn the Mixture Control Screw Control Screw LI counter clockwise Idling OK clockwise Observe the hovering mixture condition m Lean mixture Rich mixture Open the Close the Needle Valve Needle Valve a Turn counter clockwise Hovering OK Turn clockwise 4 Land the model t Idle for approx 10 seconds then reopen throttle to observe transition Float the model Lean mixture Rich mixture l Le Turn the Mixture Control Screw counter clockwise Y 1 Turn the Mixture Control Screw Idle OK clockwise Y Lean mixture High Speed Flight Rich mixture i L Open the Needle Valve Turn counter clockwise y Close the Needle Valve High Speed Flight OK Turn clockwise 4 MD tuning of hovering mixture Response too slow Response too sensitive Le Turn the Needle Valve 2 or 3 clicks counter clockwise or turn the Mixture Control Screw 1 3 degrees counter clockwise Adjust pitch control characteristics
28. ure strength at medium speeds is dependent on obtaining balanced adjustment of both the Needle Valve and the Mixture Control If both controls are already at their optimum setting some modification to these settings may be necessary to achieve satisfactory mid range throttle response but such readjustments should only be made within the range where idle reliability and high speed performance are not unduly compromised 22 23 Hover the model and actuate the throttle to observe response over the medium speed range If the engine smokes excessively 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 Needle Valve too much keeping it a little on the rich side at this stage If on the other hand hovering is not stable and response to the throttle is over sensitive or if the engine tends to overheat this indicates that the mixture is too lean and should be corrected by turning the Needle Valve counter clockwise When satisfactory hovering flight has been achieved land the model again and re check the engine s idle qualities After about 10 seconds of idling open the throttle to float the model If the transition is smooth the idle mixture is O K If the symptoms of either rich or lean running are observed readjust the Mixture Control Screw accordingly Now adjust the Needle Valve to achieve the best performance when t
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O.S.ENGINES 50SX H Manual