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Question of the day: Engine with the highest power/weight ratio? (Hint)

  • Artigo

First additional hint:

This engine produces in excess of 96 hp/lb.

That is not a misprint. Take the # of hp it produces, divide it by the # of pounds it weighs, and you'll get a number that's a little over 96.

Comments

  • Anonymous
    April 05, 2006
    I'm guessing it's something really light.  Do biological entities count?

  • Anonymous
    April 05, 2006
    THE HEART!

  • Anonymous
    April 05, 2006
    The comment has been removed

  • Anonymous
    April 05, 2006
    just a completely wild guess, but what about a hard drive's motor ?

  • Anonymous
    April 05, 2006
    > hard drive's motor

    Sounds likely to me.  An electric motor will output power proportional to the square of its dimension, but will have a mass proportional to the cube of its dimension... so making everything smaller will increase the hp/lb ratio.  Is there anything smaller?

  • Anonymous
    April 05, 2006
    ericgu has already verified that the engine in question isn't an electric motor, so we've got to guess again.

  • Anonymous
    April 05, 2006
    Well, this model airplane engine has 18 hp/lb:
    http://www.justengines.unseen.org/moki210.htm

    so it's got to be about 1/5 the size of that.

    This guy builds really tiny engines:
    http://www.minimodelengines.com/

    but he doesn't give power or weight figures on them.

  • Anonymous
    April 05, 2006
    Er, never mind, that model airplane engine isn't 110g, it's 44.7 oz.

    Helicopter engines have a power-to-weight ratio of about .1 hp/lb.  Model helicopter engines like http://www.justengines.unseen.org/ASP36r.htm get this up to about 2 hp/lb.  But 96 hp/lb?  That's got to be REALLY small.

  • Anonymous
    April 05, 2006
    OK, I think I got it.  It's a model turbine engine.

    http://www.rcgroups.com/forums/showthread.php?t=399199

    "I know the professionals can get 100 HP/lb and more"

    Model jets, huh?  Scary.

  • Anonymous
    April 05, 2006
    How about a rocket engine? They're not so heavy (if you don't include the fuel) and they prodce a LOT of power.

  • Anonymous
    April 05, 2006
    Space Shuttle main engine

  • Anonymous
    April 05, 2006
    or more specifically, SSME Turbopump

  • Anonymous
    April 05, 2006
    in fact :)   http://www.boeing.com/defense-space/space/propul/SSMEamaz.html

  • Anonymous
    April 05, 2006
    So what powers the SSME fuel turbopump?

  • Anonymous
    April 06, 2006
    I don't think it is a rocket because Eric said it has to have a shaft.

    Despite the cool factor of the 6 cycle engine http://www.autoweek.com/apps/pbcs.dll/article?AID=/20060227/FREE/302270007/1023/THISWEEKSISSUE I don't think it is this either.

  • Anonymous
    April 06, 2006
    The engine used in the SR71 has to come close.

    http://www.wpafb.af.mil/museum/engines/eng55.htm

    6000 lbs, but 32,500 lbs of thrust. Hard to convert to horsepower though. You'd have to know torque at rpm specs.

  • Anonymous
    April 06, 2006
    http://cpl.usc.edu/eschuste/turbine.htm
    Weight: 6.5 oz
    Thrust: 4 Pounds

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