steveh Posted October 30, 2017 Report Share Posted October 30, 2017 Greetings, I'm new here so hello everyone. I just came across this video of a helicopter that uses compressed air to drive the rotors rather than a shaft. It looks great , so why isn't it in production ? Are there any drawbacks in design, or just inertia from the industry ? 2 Quote Link to comment Share on other sites More sharing options...
r870 Posted October 30, 2017 Report Share Posted October 30, 2017 Here is some discussion on it: https://www.quora.com/Why-are-tip-jet-helicopters-so-rare-even-though-it-doesnt-seem-very-complex-and-would-work-fine-with-current-engines-like-turbines-or-any-kind-of-compressor Basically, engineering complexities leading to high costs, very high amount of noise produced, and low fuel efficiencies are the major drawbacks, with few advantages to offset these disadvantages. Quote Link to comment Share on other sites More sharing options...
500E Posted November 7, 2017 Report Share Posted November 7, 2017 Suggest you look at Pegasus helicopters, there are posts on this site also the web site(google)The Sud-Oust Djin was the only machine of this type to reach service I think Quote Link to comment Share on other sites More sharing options...
TomPPL Posted November 7, 2017 Report Share Posted November 7, 2017 theres more here: and here:http://www.aviastar.org/helicopters_eng/snias_jinn.php Quote Link to comment Share on other sites More sharing options...
Wally Posted November 7, 2017 Report Share Posted November 7, 2017 I forgot about the Djinn. The Fairey Rotodyne was not strictly speaking a helicopter, but my memory is that they were both LOUD! not fuel efficient. Having nozzle mass at the tips would provide excellent rotor inertia in the auto... Quote Link to comment Share on other sites More sharing options...
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