Unit-ship:Paddle Speedboat

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Description
An invention that would have even astounded Heron: the paddle speedboat uses the impulse of a giant aeolipile as well as paddle wheels to drive into opposing ships with a huge amount of power and speed. The ship barely needs any crew.


 * During sea battles, the Paddle Speedboats deploy to the carrier evasion position.
 * 30 Paddle Speedboats fill a sea battlefield space. __NOWYSIWYG__

Construction times
$$Construction \ time \ = \left \lceil Base \ time \times 0.95 ^ {n - n_0} \right \rceil$$
 * where :
 * Construction time : The calculated time (in seconds) needed to construct the specific ship on the nth Shipyard's level.
 * Base time : The time (in senonds) needed to construct the specific ship on the Shipyard's first level that the specific ship can be constructed [ for this ship 30 minutes = 1,800 seconds ].
 * n : The nth Shipyard's level.
 * n0 : The Shipyard's first level where the specific ship can be constructed [ for this ship is the  Level ].

1 - 10 = 11 - 20 = 21 - 30 = 31 - 38 =

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