Use of a turbine is not absolutely necessary : other designs include the crude pulse jet, high-speed ramjet and the still-experimental supersonic-combustion ramjet or scramjet.
32.
While the pulse detonation engine is much more efficient that the pulse jet and even turbine engines, it still suffers from extreme noise and vibration levels.
33.
In 1993 Duvha became the first power station in the world to be retrofitted with pulse jet fabric filter plants on three of its six units.
34.
Also designed by American Helicopter, each pulse jet weighed just 16 pounds, yet produced 35 pounds of thrust, and were started with an internal compressed air system.
35.
For this venture Heinkel would use a He 162 air frame powered by a pulse jet and Blohm & Voss submitted the Blohm & Voss P . 213
36.
To reduce visible emissions, the electrostatic precipitators of'A'Station were upgraded to shaker-type fabric filters, and those of'B'Station were upgraded to high pressure pulse jet bag filters, in 1976.
37.
The pulse jet was a crude jet engine which produced too much vibration to be usable for manned aircraft but found a niche in the V-1 flying bomb.
38.
He worked for the Office of Naval Research on Project SQUID, a postwar effort to develop pulse jet and rocket engines and then Republic Aviation, designing guided missiles.
39.
Pulse jet engines get extremely hot once started, and use very volatile fuels like gasoline or methyl-ethyl-ketone ( as contrasted to relatively benign, although flammable, glow engine fuel ).
40.
Water injection and other means of boost may be able to transform the pulse jet from a noisy, inefficient tube to a cleaner burning and powerful enough engine that may be of use in lightweight aircraft.
