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The Emerson "Heat Fan", the first ceiling fan to use a stack motor A close-up of the dropped flywheel on a FASCO "Charleston" ceiling fan Stack-motor ceiling fans. In the late 1970s, due to rising energy costs prompted by the energy crisis , Emerson adapted their "K63" motor, commonly used in household appliances and industrial machinery, to be ...
"The Fan Book" is the one and only book written solely about ceiling fans; and there are no other books in the Library of Congress database which even have a section on ceiling fan history, evolution, or anything like that. Unfortunately, it's kind of a specialized subject area.
The B-52's service ceiling is officially listed as 50,000 feet (15,000 m), but operational experience shows this is difficult to reach when fully laden with bombs. According to one source: "The optimal altitude for a combat mission was around 43,000 feet (13,000 m), because to exceed that height would rapidly degrade the plane's range."