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Aviation History
1920
1920 - 0556.PDF
"MSas MAY 20, 1920 Tim, zcrrctm. (1) Fuel Consumption.—This tends to produce positivebuoyancy, and is capable of mathematical expression for any class of airship as a function of the speed at which theship is flown. (2) Gaseous Superheating.—By this diurnal buoyancyvariation is produced if not masked by other effects. Maxi- mum heaviness occurs about two hours after sunset, andmaximum lightness about noon, when the gas superheating is theoretically at a maximum. (3) Irregular Causes.—Negative buoyancy is produced whenan airship encounters snow, rain, or fog, when passing from sunshine into or under cloud, or when passing suddenly fromcold air into wanner air. Conversely, positive buoyancy is produced when an airship passes from snow, rain, or fog, intosunshine, or when entering suddenly colder air. Development in plane construction Dynamic Lift.In order to obtain a clear appreciation of dynamic lift and its allied problems, it is necessary to deal with a few pre-liminary questions connected with buoyancy. Phenomena which change the buoyancy of an airship may e groupedtinder three heads, and tend to make the ship eitha heavier or lighter than the surrounding air. R 31 in flight showing initial stages in collapse of thetop vertical fin. First stage R 31 in shed, showing collapsed top fin. Third stage R 31 on landing- ground, showing collapsed fin. Second stage 556
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