ACROSS 1 In the engine model code, "H" stands for ... 11 A form of heat engine in which the fuel and air mixture is burned inside the engine 14 A mechanical device that converts the chemical energy in a fuel into heat energy, and then the heat energy is converted into mechanical energy and useful work 15 The link that transmits forces between the piston and the crankshaft of an engine 16 A type of heat engine that produces thrust by heating a mass of air inside the engine and discharging it at a high velocity through a specially shaped nozzle 18 Engine housing 21 In the engine model code, "O" stands for... 24 A plunger that moves back and for the or up and down within an engine cylinder 25 A form of heat engine in which the fuel releases its energy outside of the engine 28 A type of heat engine that changes the reciprocating (back-and-forth) motion of piston inside the cylinders into rotary motion of a crankshaft 29 When the pressure on a sample of a dry gas is held constant, the temperature and the volume will be in direct proportion DOWN 2 The ability of an aircraft engine to perform its design functions under widely varying operating conditions 3 Engine classification by cooling method employed 4 The amount of engine life obtained while maintain the desired reliability 5 The sequence in which the power event occurs in the different cylinders 6 The volume of any dry gas varies inversely with the absolute pressure sustained by it (providing the temperature remaining constant) 7 A pivoted arm used to open and close the engine valves 8 The complete installation of an aircraft engine, propeller, and all accessories needed for its proper function 9 It is used to attach the piston to the connecting rod 10 In the engine model code, "T" stands for ... 12 The part of an aircraft engine in which the chemical heat energy of the fuel is converted to mechanical energy 13 Stored energy 17 A device for actuating the valve lifting mechanism 18 Transforms the reciprocating motion of the piston to rotary motion for turning the propeller 19 The end of the engine is the rear end 20 Energy in motion 22 The shaft end of the engine is the front end 23 The type of reciprocating engine that has the lowest weight-to-horsepower ratio 26 A type of aircraft engine in which the crankshaft is held stationary, and the cylinders rotate about the crankshaft 27 Any device for regulating or determining the direction of flow of a liquid or gas