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#1
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gliders with Jet engines
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#2
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"M B" wrote in message ... Some disadvantages a fuel can catch fire, the engine is very hot, have to figure out fuel routing and fuel tanks, very noisy, needs interesting engine instruments, needs overhaul, may be damaged by FOD (rocks and such in intake). An electric engine seems to have only two major disadvantages: very heavy batteries and a prop that takes space to turn and to stow. There was a Luscombe that had a 150hp turbine that I saw up at Columbia, CA. I heard it caught fire in Texas a few years ago and was destroyed (although rumor had it the people survived fine). The turbine idea sounds neat, but I would personally be a little wary of all the heat it produces and the very real fire hazards. But I bet it'd be a real airshow pleaser! Have you ever seen a lithium cell that had what the manufacturer delicately referred to as "an outgassing event"? Granted that fuel can catch fire, at least the oxidizer is not mixed in with it. It only burns on the surface. A high energy density battery is more like a rocket engine -- or a bomb. The fuel and oxidizer are already mixed together, and so reactions can happen very quickly. This is not to say that batteries are bad, just that any high energy density storage system is going to have safety concerns. Tim Ward |
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I'll try to remind again of the existence of "Bocian - Puls" - a SZD-9
Bocian equipped with two tiny pulse jet engines for take off purposes. Of course it was an experimental design. Regards, -- Janusz Kesik visit www.leszno.pl - home of the www.wgc2003.pl Here you can find some photo of the glider: http://www.piotrp.de/SZYBOWCE/pbopuls.htm They are poor due to old paper scan. Also some info available but only in Polish and German. Regards Jaroslaw Zaczek |
#4
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Eric Greenwell wrote:
very noisy, What does it sound like? I've never heard one. Worse than a DG 400? It's obvious you've never heard one, if you ask this. Go to a model aviation club (I don't know the correct word, but you know what I mean) and listen to their model jets. The relation of my club to our neighbours is not always without problems, but all in all, we live in peace together. I guess this would change very fast if we would operate jet driven gliders! Stefan |
#5
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On Wed, 17 Sep 2003 20:43:14 -0700, Eric Greenwell
wrote: very noisy, What does it sound like? I've never heard one. Worse than a DG 400? Worse than a small/big/huge dirt bike? I believe that model size turbines are quieter than the equivalent glow-motor driven ducted fans. I've heard their sound described as being similar to first generation full size jet engines. -- martin@ : Martin Gregorie gregorie : Harlow, UK demon : co : Zappa fan & glider pilot uk : |
#6
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Bob,
Your correct as to the spelling of Max Dreher's last name. Bill Higdon Bob Whelan wrote: Max Dreher...in (I believe) a Prue 215. Several articles by/about him in "Soaring" mags from the 1960's. Regards, Bob Whelan - - - - - - "Bill Higdon" wrote in message ... Janusz Kesik wrote: I'll try to remind again of the existence of "Bocian - Puls" - a SZD-9 Bocian equipped with two tiny pulse jet engines for take off purposes. Of course it was an experimental design. Regards, First one I know of was a fellow by the name of Max Drayer(SP), he built his own turbine engine back in the early 60's. The engine was reatractable when not running. Oh yes he flew ME-262's during the last of WWII. Bill Higdon |
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Bill Higdon wrote:
Your correct as to the spelling of Max Dreher's last name. It's asking a bit much to be able to spell a foreign name when you can't spell your own language, I guess... Stefan |
#8
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Jet Noise...
Some 30 years ago, after a promise to let me fly it, I helped a visiting pilot ( like me) to rig his jet equipped Diamant at Schanis (Switzerland). I have no idea what the 'engine' make was, it was mounted on top of fuselage - pilot was just about able to carry it! After an eardrum shattering warm up and almost ready to fly, the owner/ Chief Instructor of airfield strolled across and asked if Diamant owner proposed launching with engine. On getting an affirmative the owner of the airfield bluntly refused permission - he said that the residents of the nearby village were still complaining about the noise created when he last flew there over a year ago. Imagine the din echoing off the mountains flying at around 50kts for ten minutes in a country that has very strict laws on noise! The Diamant owner reluctantly removed the engine and took an aerotow. He confided that he was seldom able to fly more than once at any given airport. Later, on a particularly quiet night, I thought I heard a faint echo of the Diamant jet, but it could have come from nearby Zurich International... Never did get to fly it... Lou Frank "Eric Greenwell" wrote in message .. . In article , says... Some disadvantages a fuel can catch fire, Have you ever seen the inferno a huge stack of batteries can generate? the engine is very hot, How hot is it? They put these things inside model helicopters and other model aircraft, so it must be manageable. have to figure out fuel routing and fuel tanks, Doing this has got to be a lot easier than figuring out where to put the batteries, which will occupy much more space and weigh far more. Motorglider builders solved this decades ago. very noisy, What does it sound like? I've never heard one. Worse than a DG 400? Worse than a small/big/huge dirt bike? needs interesting engine instruments, needs overhaul, may be damaged by FOD (rocks and such in intake). If mounted on top of the fuselage, it shouldn't be any worse than a propeller. -- !Replace DECIMAL.POINT in my e-mail address with just a . to reply directly Eric Greenwell Richland, WA (USA) |
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