Chapter VII
Why Lubrication Is Necessary—Friction Defined—Theory of Lubrication—Derivation of Lubricants—Properties of Cylinder Oils—Factors Influencing Lubrication System Selection—Gnome Type Engines Use Castor Oil—Hall-Scott Lubrication System—Oil Supply by Constant Level Splash System—Dry Crank-Case System Best for Airplane Engines—Why Cooling Systems Are Necessary—Cooling Systems Generally Applied—Cooling by Positive Pump Circulation—Thermo-Syphon System—Direct Air-Cooling Methods—Air-Cooled Engine Design Considerations.