61vf Manual
User Manual: 61vf-manual
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O.S. MAX-61VF INSTRUCTIONS FOR O.S. MAX 61 VF ENGINE The O.S. MAX-61 VF is a high performance engine that has been developed expressly for FAI type R/C contest models. It employs schnuerle scavenging and a rear exhaust port to facilitate the installation of a tuned silencer system, especially where the latter is to be built into the fuselage. This engine features specially developed ABC type piston/ cylinder construction and a 17 mm O.D. crankshaft of heavy duty alloy steel in order to provide extra power and durability and is equipped with an O.S. Type 7D carburettor, specially designed to give good throttle response. Modern precision machinery and carefully selected top-quality materials are employed in the manufacture of this engine to ensure consistent performance and long life. SPECIFICATIONS Displacement Bore Stroke Practical R.P.M. Power output Weight 9.95 c.c. (.607 cu. in.) 24.0 m.m. (.945 in.) / 22.0m.m. (.866 in.) 2,000 ~ 17,000 r.p.m.) 1.8 PS (17,000 r.p.m.) 528 g (18.6oz.) INSTALLATION Mount the engine securely on rigid hardwood mounts or metal bearers. For highest performance and safe running, we recommend that the bearers should be as heavy and as rigid as possible. Make sure the engine bearers are parallel and their mounting surfaces are in the same plane. Use 4 m.m. or 6—32 steel screws, such as Alien type, with locknuts, for bolting the engine to the bearers. RUNNING-IN ("Breaking-in") The special ABC type piston/cylinder construction, two ball bearings, bronze bushed connecting rod, etc., enables this engine to be operated after a shorter running in period. Preliminary bench running can be omitted. However, for long life and peak performance please observe the following procedure: Install the engine in your model and fly it with a rich needlevalve setting so that it runs at a fast '4 stroke' for the first two or three flights. Then readjust the needle valve for a slightly less rich mixture (i.e. at a reduced speed '2-stroke') for the next four to six flights. FUEL Use a good quality commercial fuel or one of the fuels shown in the table. "A" is suitable for general use. If higher output is required, fuels containing 10 to 20% of nitro methane; (e.g."B") may be used after running in. Lubricants can be either castor oil or synthetics provided that they are always of the best quality. A B Methanol 77% 57% Castor Oil 23% 23% Nitromethane - 20% GLOW PLUG Since the compatibility of the glow-plug and fuel can have a considerable effect on performance and reliablity, it is suggested that the user selects the R/C type plug found most suitable after tests. Recommended O.S. glow-plugs are No. 8 and No. 9. PROPELLER Suggested propellers for pattern flying are 11 x 7-8. The suitability of the prop. depends on the size and weight of the model and the type of flying. Determine the best size and type after the engine has been run in. Check the balance of propeller before fitting it to the engine. Unbalanced propellers cause vibration and a loss of power. Wooden propellers are to be preferred. Some nylon propellers are not strong enough to withstand the high power output of this engine and a thrown blade can be very dangerous. SILENCER As this engine has been designed primarily for use with a tuned length exhaust silencer system, a conventional silencer is not supplied. Any of the tuned pipe silencers currently available for 10cc engines may be used by inserting, with the aid of silicone tubing, a short length of 18—20 mm o.d. aluminium tubing between the exhaust adaptor (supplied with the engine) and the tuned silencer. The length of the intermediate tube should be determined initially in accordance with the instructions issued with the tuned silencer and then adjusted, as necessary, in accordance with the prop and fuel used, after test flights. Generally speaking, this intermediate tube length will require to be between 6 cm (2.4") and 10 cm (4"). Alternatively, a special O.S. exhaust header pipe is available as an optional extra part. CARBURETTOR The special O.S. automatic carburettor described in the attached instruction sheet is fitted, as standard, to this engine. An exhaust pressurised fuel system should be used with this carburettor for best results. PARTS LIST Description Crankcase Code No. 27113004 Description Screw Set 27101602 Front Housing 27102008 Crankshaft Cylinder & Piston Assy. (ABC) Cylinder Head 26714006 26617004 9R731002 Gasket Set Piston Pin Retainer Ball Bearing (Front) 27130000 Ball Bearing (Rear) Carburettor Complete (7D) Carburettor Retainer Code No. 27101000 27103005 26704007 26705004 29081004 Connecting Rod Piston Pin 27106007 27107004 27108001 29008219 28009002 45010002 29081719 Exhaust Adaptor Complete Exhaust Header-Pipe Complete Cover Plate Drive Washer Woodruff Key 27126109 *27126202 *72101300 Silicone Tubing Set Propeller Washer *72101103 Tuned Silencer Propeller Nut Optional parts The specification is subject to alteration for improvement without notice. Exhaust Header-Pipe Silicone Tubing Tuned Silencer O.S. ENGINES MFG CO LTD 6-15 3-chome Imagawa Higashisumiyoshi-ku Osaka 546, Japan. TEL. Osaka (06) 702-0225 57912
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