By Joseph J Shimandle (Jjsjjsva) on Thursday, May 20, 2010 - 10:49 pm:
Newport News Shipbuilding in Virginia use to launch the nuclear powered attack subs backwards down an inclined ramp called a shipway. The subs were assembled and out fitted on an incline ramp such that you had to use a specially made 'level' to ensure every thing would be plumb when floating horizontally. You couldn't see much of the sub when it was launched if you were in the grand stands on land, but if you were in a boat out in The James river it looked as if the backwards sliding sub was going to completely disappear underwater- but they never did.
Now NNS builds the latest attack subs horizontally in an enclosed facility on railcars and they push the sub onto a floating dry dock which lowers into the water to launch the sub.
The nuclear aircraft carriers are assembled in a dry dock and floated out using tugs. Not real exciting to watch because it's a tight fit between the dry dock walls so they pull it out very slowly.