The Mark 13 torpedo was the U.S. Navy's most common aerial torpedo of World War II. It was the first American torpedo to be originally designed for launching from aircraft only. They were also used on PT boats.
A Mark 13B torpedo being loaded onto a Grumman TBF Avenger aboard the Wasp in 1944; the torpedo is fitted with wooden breakaway nose and tail protection which is shed upon hitting the water
Mark 13 torpedo's general arrangement, as published in a service manual
Douglas TBD Devastator making a practice drop with a Mark 13 torpedo, October 20, 1941
A Mark 13 being launched from a PT-boat
An aerial torpedo is a torpedo launched from a torpedo bomber aircraft into the water, after which the weapon propels itself to the target.
An aerial torpedo dropped from a Sopwith Cuckoo during World War I
In 1915, Rear Admiral Bradley A. Fiske conceived of the aerial torpedo
The Short Type 184 was the first torpedo aircraft when built in 1915
Breakaway wooden fins help stabilize the torpedo in the air. They grip the metal fins only by friction, and are forced off upon entry into the water.