FOX MANUFACTURING CO.
SUITABLE MODELS - Your Fox 10 is suitable for model airplanes designed for motors up to 15 size. In the event you are not sure here are some good rules to thumb.
MOUNTING - Your Fox 10 should be mounted on hardwood beam motor mounts, not balsa, and firmly attached with 3-56 or 3-48 screws. The motor mount in turn should be securely glued and gussetted to the plane so that they will absorb the vibration without becoming loose.
FUEL TANK - A good engine run is completely dependent upon a good tank installation. For Control Line models the tank should be mounted directly in back of the motor and with the centerline of the tank directly in line with the needle vale when in normal flight.
PROPELLER - we recommend a 7" diameter 4" pitch prop for small models and an 8" diameter 3" pitch for larger models. Large Radio Control models may fly better on a 9" diameter 3" pitch prop.
FUEL TO USE - Usually Missile Mist is your best bet. On very hot days or to obtain better low speed characteristics Fox Superfuel may work better.
PROCEDURE FOR STARTING THE MOTOR
1. Set the model level and fill the tank.
NEEDLE VALVE ADJUSTMENT - The needle valve controls the amount of fuel the motor gets. It is desirable to adjust the needle so the engine always gets a little more fuel than it really needs at all times. Too rich (too much) a run does no harm, but too lean a run may burn out the Glow Head and even overheat the motor so the piston is ruined.
GLOW HEAD - Ignition occurs automatically when the piston brings the fuel mixture up on compression and it is subjected to a red hot platinum coil. This platinum coil is extremely fragile and will often burn out or be broken by particles of dust that go through the motor. It is impractical to guarantee these coils and you should consider replacement of the Glow Head occasionally to be a standard part of your operating expense.
EXHAUST VALVE - Speed reduction is accomplished by restricting the exhaust. If your Fox 10 does not run slow enough with the Valve closed, pressure is escaping either around the Valve or up between the cylinder and top of the casting. The exhaust can be tightened by carefully filing the small end of the Exhaust Valve Bushing.
DIS-ASSEMBLY - We generally recommend that you do not dis-assemble your Fox 10. However, you will not harm it provided you do it correctly. We cannot assume responsibility for parts ruined by incorrect assembly.
1. Remove from airplane - Remove prop and needle valve.
5. The piston and rod are permanently assembled.
TO RE-ASSEMBLE - Reverse this procedure. Use new gaskets.