When does a boat become a ship and vice versa ?

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Which is better? Johnson, Mercury or Evinrude?

That depends on it's use more than size.. Most all surface vessels used in defense or in commerce are ships. Even then it is not improper to call them all boats.. Dictionary.com says:

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boat /boʊt/ Pronunciation Key - Show Spelled Pronunciation[boht] Pronunciation Key - Show IPA Pronunciation
–noun
1.A vessel for transport by water, constructed to provide buoyancy by excluding water and shaped to give stability and permit propulsion.
2.A small ship, generally for specialized use: a fishing boat.
3.A small vessel carried for use by a large one, as a lifeboat: They lowered the boats for evacuation.
4.A ship.

If you were going to buy an old beat up sailboat cheap (relatively)?

That about clinches it for me... Jim

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A boat becomes a ship when it can carry a boat.

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A boat becomes a ship when it grows up. You know what they say Size does matter.

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A trusty old answer for this question.

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You can put a boat on a ship, but you cannot put a ship on a boat

Why didn't ship designers make another Titanic??

A ship you ship cargo with, and thats why the call them ships