Remember, when i said, on this blog about the locomotive that has the bar-rod that extends from 1 wheel to the next wheel...Well you can do the same with the propellers of a ship/boat....Create 1 propeller, and have 1 road stuck to the next and when 1 propeller moves, it rotates the other, automatically, just with the energy of: 1 propeller...So 1 propeller can rotate 3, 4, 6, 8 of them provided you had enough room under to place the propeller....1 rotates and is pedalling the other one and the other one is rotating and is pedalling the other one...So for the price of 1 propeller you reach: 3 or whatever number of propellers faster...All for the price of 1 propeller....

so theoretically speaking with 2 engine propellers the boat will go 8 times faster or with the speed of 12 propellers....

they will work like a piston, each piston is 1 propeller even though i´ve only seen pictures of pistons on TV...

just got to know where to put the propellers....you can do it with planes, the engines of planes with the propeller of airplanes engines...

i owe this idea partly to a: UFO show i saw on TV close to the coast of florida...and to the movie: Hellboy...