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HVDRODVNAAriCS TN SHIP DESIGN 



Fig. 76.J Aerial View of U. S. Navy ARD Type Floating Drydock 

 Official U. S. Navy photograph. The gate which closes the stern is hinged horizontally along its lower edge. Screw 

 propellers, if fitted for self-propulsion, would be close to the extreme stern and just inboard of the outside of the dock. 



and which can control itself when hove to in 

 heavy weather, has all the principal attributes of 

 a ship, and is so classified here. Basically, it 

 resembles a single-ended car ferry or a "seatrain" 

 in its ability to accommodate a bulky, heavy 



cargo, with the disadvantage that the "cargo" is 

 generally all in one package, extending below 

 the water as well as above it. The self-propelled 

 floating drydock also may be considered as a 

 partly submersible ship with a large, U-shaped, 



