The modern definition of a torpedo is a self-propelled underwater missile.
(see related question)
Torpedo
Torpedo
The answer to this multiple-choice question was a torpedo. The reason that the question specifies "usually" is that ASW aircraft can launch torpedoes.(The word missile in military usage always means self-propelled weapons.)The ASROC is a rocket-boosted torpedo, and many other types of missiles are launched from ships and submarines, including cruise missiles such as the Tomahawk. Trident (FBM) submarines can launch strategic ICBMs.*All submarine weapons are actually ejected from the vessel prior to its activation: torpedoes are ejected by water impulse, as are SUBROC, Harpoon, and Tomahawk missiles. Their motors start once they've cleared a certain range from the vessel. Ballistic missiles are ejected by air impulse - launch is near the surface, and the missile is ejected into a pocket of air or steam where the rocket motor ignites.
no because torpedos are self propelled, people are too but the are to slow to be "launched" from a torpedo tube.
The term for the self-propelled missile or vehicle is "rocket."The similar proper noun, a New York dance company, is the Rockettes.
self propelled reaper
Yes - Alvin (DSV-2) is completely battery powered when performing deep ocean operations, when released from its tender.
Lunokhod-1 was the first self-propelled vehicle on the moon.
An aircraft with an engine. A non-self propelled aircraft would be a balloon or a glider.
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