Interesting...I was wondering there they got that much kinetic engery so quickly. I wasn't suggesting it would work in this situation, but might stir some creative juices in the list! Josh -- A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams On 8/15/05, Robert Young wrote: > I believe those use something similar to a blank pistol cartridge as the > prime mover for the blade brake. > > It is neat to watch them shove a raw hotdog into the blade and it stops. > Not very practical if you are mowing rocks though. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist