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'[EE:] Sled propulsion'
2004\01\09@072923 by Olin Lathrop

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Jinx wrote:
> Does anyone have suggestions (and hopefully practical
> experience) for methods of propelling a sled on a track ?

A snowy hill usually works.

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2004\01\09@074621 by Jinx

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> > experience) for methods of propelling a sled on a track ?
>
> A snowy hill usually works.

Ah-ha, the obvious. Specify that proper operation is not
guaranteed away from the Cresta Run or Aspen

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2004\01\09@083851 by Alan B. Pearce

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.> > experience) for methods of propelling a sled on a track ?
>>
>> A snowy hill usually works.
>
>Ah-ha, the obvious. Specify that proper operation is not
>guaranteed away from the Cresta Run or Aspen

In view of the discussion of tennis ball lobbers, have you considered the
possibility of a clay pigeon launcher, or whatever they happen to be called.

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2004\01\09@121950 by Mike Singer

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Jinx wrote:
> > A snowy hill usually works.
>
> Ah-ha, the obvious. Specify that proper operation is not
> guaranteed away from the Cresta Run or Aspen

  Does anybody remember IBM-360 hard disk drives with
the great linear drives? Cylinder magnet and a sled inside.
  Few of them lined up will look awfully (though not as awfully
as new NASA's underground launcher project)

Mike.

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2004\01\09@132220 by Steve Smith

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It has just come to me !

Change the angle of inclination ov the track such that it is
perpendicular to a level plane ! This should then assure you of maximum
acceleration with no added weight so the whole of the weight budget can
be devoted to minimizing friction with the guide rail and the air.
Better till do away with the air this would negate even more ov the
friction. Hence the only thing to worry about is the friction between
the sled and guide rail !

(pulse jet wont work in a vacuum) you may need solid fuel booster !

Steve.....

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2004\01\11@171431 by Russell McMahon

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> > Does anyone have suggestions (and hopefully practical
> > experience) for methods of propelling a sled on a track ?

> A snowy hill usually works.

Yes, that would do it!
However, due to the largish value of acceleration required (something over
50 earth normal g), the snowy hill would probably need to be located
somewhere deep in the gravity well of Jupiter. Water snow may have problems
there so other surfacing materials may be needed (maybe eg iron snow).



       Russell McMahon

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2004\01\12@165903 by James Nick Sears

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Unfortunately this provides only 2% of the OP's desired acceleration!

Nick


----- Original Message -----
From: "Steve Smith" <.....xygaxKILLspamspam@spam@BLUEYONDER.CO.UK>
To: <PICLISTspamKILLspamMITVMA.MIT.EDU>
Sent: Friday, January 09, 2004 12:20 PM
Subject: Re: [PICLIST] [EE:] Sled propulsion


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