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Doblhoff WNF 342 V4 model. During the Second World War, German engineer Friedrich von Doblhoff suggested powering a helicopter with ramjets located on the rotor tips. His idea was taken forwards and, during 1943, the WNF 342 V1 became the first tip jet-powered helicopter; it used a conventional piston engine to drive both a compact propeller and an air compressor to provide air (subsequently ...
This handle governs the tips of the jet nozzles. The tips (jetavators) are spring-opposed and can, with the aid of the flexible thrusts, be slanted forward or back. The pilot inclines the handle forward or back and slants both nozzle tips at the same time to fly straight. If pilot must turn, he turns handle, to slant the nozzles in opposite ...
The nozzle opens up in two halves which come together to redirect the exhaust partially forward. Since the nozzle area has an influence on the operation of the engine (see below), the deployed thrust reverser has to be spaced the correct distance from the jetpipe to prevent changes in engine operating limits. [16]
Kort nozzle The towboat Dolphin I in a floating drydock on the Mississippi River in Algiers, Louisiana. A ducted propeller, also known as a Kort nozzle, is a marine propeller fitted with a non-rotating nozzle. It is used to improve the efficiency of the propeller and is especially used on heavily loaded propellers or propellers with limited ...
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While research into this nozzle continues, it could be used before all its advantages are developed. As an upper stage, where it would be used in a low ambient pressure/vacuum environment specifically in closed wake mode, an E-D nozzle would offer weight reductions, length reductions and a potential increase to the specific impulse over bell nozzles (depending on engine cycle) allowing ...
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