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    Why are gas turbine engines not used in automobiles?

    what about radial turbines? wouldn't they generate more torque than thrust? also read somewhere that radial turbines are better at lower speeds. can anyone give more details on transmission design of turbine powered cars and motorcycles?
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    Why are gas turbine engines not used in automobiles?

    as far as i hav read, coz they need to be at very high rpms, and no effective throttle response but can anyone provide me more figures? more literature?
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    Why are gas turbine engines not used in automobiles?

    barring a few exceptions i read that it is because they aren't effecient at small scale. can someone elaborate on that? also, would even smaller turbines need some time to start up?
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    Everyone Wants My Personal Information!

    before i comment on this issue i would like everyone on this thread to pm me their email addresses
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    Are phosphor sheets used in CRTs transparent?

    how very stupid of me. another thing, can you tell me if the indivudual particles of phosphor are at micro or nano scale? if they they are nano sized and embedded (closely packed) in a plastic sheet, would it be transparent.
  6. C

    Are phosphor sheets used in CRTs transparent?

    well, if you look at a CRT TV turned off, you just see blackness (and a bit of reflection of the screen), not tiny red green blue dots, so i think, maybe they are transparent.
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    Are phosphor sheets used in CRTs transparent?

    and if they are, to what extent?
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    Piston seals

    now that i have a clear idea of piston seals, i have real doubts regarding how seals are maintained in wankel engines. if there is no force pushing the apexes and side seals, how are they sealed properly?
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    How would you end the world?

    skynet
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    Piston seals

    ok. then again, if piston heats up more and expands more, wouldn't it create enough contact stress? you might argue that it would need precise clearances, but wouldn't you need that for seals as well? that is what my doubt keeps coming back to. whatever function the seals are serving, could be...
  11. C

    Piston seals

    yes, but wouldn't there be much less of a difference if both piston cylinder were made of cast iron? isn't that why cast iron is used in the first place? because it retains shape/size even under high temperatures? if a cast iron seal can make up for expansion difference between piston and...
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    Piston seals

    Re: pisotn seals ok i get it. but what about the gaps in piston seals? do they seal off by expansion? the seals themselves are manufactured with that clearance. would manufacturing costs really increase that much for making pistons and blocks of desired clearance?
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    Piston seals

    as far as i understand, piston have cast iron seals because of the properties of cast iron, which make it a sealing material. but i was wondering, if the cylinder and piston are both made of cast iron and closely fitted together, could we avoid using seals all together? friction doesn't depend...
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    How is a wankel engine lubricated?

    i do not understand what u mean by that. how does the pressurized system work? is the oil introduced at top and collected thru bottom while keeping the "major axis" of the epitrochoid vertical?
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    How is a wankel engine lubricated?

    yeah, but that's just the type of lube what is the actual method? is it just mixed with the charge like a two stroke? is there no other way, like having a wet/dry sump system?
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    How is a wankel engine lubricated?

    i was admiring its animation like when this popped into my head. any answers? also anybody know any latest developments in lubricating closed off engines?
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    Rotary atkinson cycle engine

    what does that mean?
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    Rotary atkinson cycle engine

    what about the wankel engine? it needs some exact geometries and is not hard to make practically. i think major problem is the sealing of surfaces of rotors against the housing.
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    Rotary atkinson cycle engine

    http://white-smoke.wetpaint.com/page/Rotary+Engine [Broken] does anyone know of this engine being used in production?
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    Dreams of the future

    wow, so many people confessing to having dreams of the future and deja vus. i have a few questions to all of 'em. doesn't really mean anything, just trying to see what's common- have you taken a proper IQ test, if so what was your score? have you been diagnosed with an autism spectrum disorder...
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    Rotary vane engines

    by 'considerable stress'i meant that the load can't be handled by existing materials technology
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    Rotary vane engines

    are the 'vanes' of a rotary vane engine a major disadvantage? granted that the vanes would be under considerable stress, but is it so much larger than the stress on connecting rod in reciprocating engines? and is sliding friction on sides very high compared to pistons? also, is sealing a major...
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    More efficient compressor

    given the same volume and rate of air flow, which would be more efficient compressor between a rotary vane compressor and a bellow?
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    Good science fiction shows?

    ^:rofl: firefly
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