How about a pneumatic / hydraulic cylinder and some mechanical linkage for the required length? D. Artificial Intelligence is no match for Natural Stupidity. >From: Jinx >Reply-To: pic microcontroller discussion list >To: PICLIST@MITVMA.MIT.EDU >Subject: Re: [EE]: Sled propulsion >Date: Fri, 9 Jan 2004 13:51:51 +1300 > > > A firework maybe? > >Hmmm, smoke, noise, injuries, cost ? A nice big red >chysanthemum would certainly have some ephemeral >entertainment value though, that's for sure. I think I may >have a little trouble for indoor use, regulation-wise > >I'm leaning towards compressed air, but it's still a clean >blackboard so anything's possible > >Maybe "rail gun" was the wrong choice of words. Don't >want to have to get in the car to fetch the sled back every >20s ;-) > >Perhaps more along the lines of a linear motor, if it can >get the sled to top speed within a meter or two > >-- >http://www.piclist.com hint: The list server can filter out subtopics >(like ads or off topics) for you. See http://www.piclist.com/#topics _________________________________________________________________ Have fun customizing MSN Messenger learn how here! http://www.msnmessenger-download.com/tracking/reach_customize -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.