280fxColorado Posted June 2, 2011 Posted June 2, 2011 (edited) Never seen this before, very cool video! Hydrogen Peroxide tipjet chopper. Edited June 13, 2011 by 280fxColorado Quote
lelebebbel Posted June 3, 2011 Posted June 3, 2011 I've been looking for that video for years! I saw it at a Bell safety presentation, they used it to show the different airflow patterns in a hover vs. translational flight. Great video for that reason Looks like fun! Apparently, starting that thing involves being surrounded by a shower of liquid hydrogen peroxide ( = rocket fuel), which is then ignited. Not to mention that your seat is also the tank. Hiller built some tip jet prototypes like this decades ago, but it turned out to be a rather impractical way to drive a rotor. Quote
Karl Posted June 3, 2011 Posted June 3, 2011 I've been looking for that video for years! I saw it at a Bell safety presentation, they used it to show the different airflow patterns in a hover vs. translational flight. Great video for that reason Apparently, starting that thing involves being surrounded by a shower of liquid hydrogen peroxide ( = rocket fuel), which is then ignited. Not to mention that your seat is also the tank. Hiller built some tip jet prototypes like this decades ago, but it turned out to be a rather impractical way to drive a rotor.That doesn't sound quite right. Usually the H2O2 is around 90% dissolved in water and the catalyst (often silver mesh) causes it to break down into superheated steam and O2. Here's another link I found.H2O2 copter Quote
lelebebbel Posted June 3, 2011 Posted June 3, 2011 must have been a different fuel they were talking about then. The one I was referring to had to be ignited with a flare on a (looong) stick.. Quote
Karl Posted June 3, 2011 Posted June 3, 2011 must have been a different fuel they were talking about then. The one I was referring to had to be ignited with a flare on a (looong) stick..That sounds like a ram jet helicopter. It would look similar. Like this. Quote
IFLY Posted June 9, 2011 Posted June 9, 2011 (edited) Never seen this before, very cool video! Hydrogen Peroxide chopper tipjet chopper. That was based here in Tucson for a while and I hovered it for a few minutes. They had two different tip jets and when I was trying it they had the bad jets on it. Spit unburned out a bit . It has full manual throttle and twisting the cyclic controlled yaw...no pedals. It was at Oskosh last year. Jerry I have some video of me bouncing it around on the ground when it ran out of power and the rpm drooped...see if I can find it. Edited June 9, 2011 by IFLY Quote
500E Posted June 10, 2011 Posted June 10, 2011 Both Hillier & Sud-oust made tip jets, there were 180+ djinn used by the French forces.Hillier had a some flying.The the bled air concept of Hughes X17http://en.wikipedia.org/wiki/Hughes_XH-17 Quote
Tarantula Posted June 13, 2011 Posted June 13, 2011 Any other insights on it IFLY? Were you impressed by it? Did it seem under/over powered? I'm fairly interested in it and would love some info from someone who has seen it, since there isn't a lot you can gleen out of the few videos out there. Quote
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