User manual OS ENGINES MAX-46AX

[. . . ] 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. It is suggested that any instructions supplied with the aircraft, radio control equipment, etc. , are accessible for checking at the same time. CONTENTS SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O. S. [. . . ] Check the balance of the propeller before fitting it to the engine. Unbalanced propellers cause vibration and loss of power. Some nylon propellers are not strong enough to withstand the high power output of these engines and a thrown blade can be very dangerous. 14 Sport 10. 5x6, 11x6-8, 12x6-7 Reminder!Never touch, or allow any object to come into contact with, the rotating propeller and do not crouch over the engine when it is running. MIXTURE CONTROLS Two mixture controls are provided on this Carburetor. The Needle Valve (at rear of engine) When set to produce maximum power at full throttle, this establishes the basic fuel/air mixture strength. The correct mixture is then maintained by the carburetor's built-in automatic mixture control system to cover the engine's requirements at reduced throttle settings. The Mixture Control Valve (carburetor) This meters fuel flow at part-throttle and idling speeds to ensure reliable operation as the throttle is opened and closed. The Mixture Control Valve is factory set for the approximate best result. First run the engine as received and readjust the Mixture Control Screw only if necessary. 15 BEFORE STARTING Tools, accessories, etc. The following items are necessary for operating the engine. 1 Fuel Model glowplug engine fuel of good quality, preferably containing a small percentage of nitromethane. 2 Glowplug Fit a glowplug to the engine. 4 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). If a 2-volt cell is employed, use a resistance wire, as shown, to reduce applied voltage, otherwise element will overheat and burn out. 1. 5 volt heavy-duty or 2 volt rechargeable dry battery lead-acid cell (at least 5Ah) Warning (Very hot) Never touch the nichrome wire while the battery is connected. Resistance coil (nichrome wire) to ge ss. e olta er v ightn Low uce br red e Raisage to volt ease . cr tness in h brig Battery leads Adjust applied voltage by changing the position of clip on resistance coil until glowplug element is glowing bright red. 5 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. 6 Fuel tank For installation in the model a 300cc (10. 6oz. ) tank is suggested. 7 Fuel bottle or pump For filling the fuel tank, a simple, polyethylene "squeeze" bottle, with a suitable spout, is all that is required. 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. 8 Electric starter and starter battery An electric starter is recommended for starting. 12V Battery 10 Silicone tubing This is required for the connection between the fuel tank and engine. 11 Plug wrench Used for tightening glowplug. long plug wrench is available as an optional accessory. For tightening glowplug Fuel bulb Fuel pumps Electric Manual Starter STARTING 1. Install appropriate propeller and tighten securely. [. . . ] A different silencer may alter the exhaust pressure applied to the fuel feed and call for a revised NeedleValve setting. The use of a different glowplug may also require compensating carburetor readjustments. 24 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. O. S. 'Super-Filters'(large and small ) are available, as optional extras, to deal with this problem. [. . . ]