la voila, mais en vidéo tu connaîtra ça puissance (la vidéo est en haut): http://www.google.fr/imgres?hl=fr&gbv=2&biw=1280&bih=846&tbm=isch&tbnid=wq7zesBAX0mv3M:&imgrefurl=http://www.washingtonpost.com/blogs/blogpost/post/5-cool-things-railgun-developed-for-navy-warship-will-be-able-to-do/2012/02/29/gIQALcnTiR_blog.html&docid=uKRRhSZdZJaq6M&imgurl=http://www.washingtonpost.com/rf/image_606w/WashingtonPost/Content/Blogs/blogpost/Images/Navy_Electromagnetic_Railgun_0567d.jpg%253Fuuid%253DuskKnmL7EeG1HAHZE1E9Yw&w=606&h=395&ei=myvGT5n5Bca3hQeom9WnBQ&zoom=1&iact=hc&vpx=393&vpy=164&dur=438&hovh=181&hovw=278&tx=210&ty=133&sig=111974232049995196664&page=1&tbnh=150&tbnw=200&start=0&ndsp=20&ved=1t:429,r:1,s:0,i:70