I wonder if a “normally sealed unit” - as “sealed” as most ordinary “sealed” units are in cars today, filled with some very slippery but dense liquid..
That would generate *lots* of friction, which is why ships are slower than planes, and space ships are faster (sort of).
36 posted on 07/13/2011 3:47:57 PM PDT by Atlas Sneezed
(Government borrowing is Taxation without Representation)