The position of the float bowl in relation to the flowjector of the pulse jet engine is important. If it is
too high, too much fuel will flow. If it is too low, not enough fuel will flow.
Fog Oil System. The fog oil system (Figure 5) consists of a fog oil inlet hose, a fog oil line, an oil
metering globe valve, a fog oil injecting line, a pressurizing line, a fog oil exhaust hose, and a fog oil
Figure 5. Fog oil system.
The fog oil inlet hose is placed in the fog oil drum. The exhaust hose, also placed in the fog oil
drum, is the return line for excess fog oil that has been used to lubricate the air motor of the fog oil
pump. Fog oil is drawn from the drum and pumped through the fog oil line to the engine tube of the
generator. Hot exhaust gases from the pulse jet engine vaporize the fog oil and push it out into the
atmosphere. Upon contacting the atmosphere, the fog oil cools to form billowy white smoke. The flow
of fog oil is controlled by the oil metering globe valve. The fog oil pump consists of an air motor and an
oil pump. The fog oil pump delivers fog oil to the pulse jet engine. The pump assembly is mounted
above the smoke outlet nozzles of the outer discharge baffle. The main parts of the air motor are the air
cylinder, the piston, and the pressure inlet valve. The main parts of the oil pump are the oil cylinder, the
piston rod, and the outlet valve. Relief valves on the air motor are provided to drain excess fog oil from
the air cylinder.
Starting System. The starting system (Figure 6) consists of an ignition system and a starting air system.
The ignition system consists of a