Problems in physics. Derived from military situations and experience (1919)
United States. War Dept. Committee on education and special training, Dodge, Homer Levi, 1887- · [Washington? · leaf 146
inst the wind pressure. The ballonets are also employed in altitude control. Valves arearranged so that either ballonet can be inflated at will. Trans-ferring 1,000 cubic feet of air from one to the other tilts the balloon5 degrees. When the balloon is under way this furnishes a veryeffective means… … BALLOONS 119 PROBLEMS 46. How much lift at the ground would an 84,000 cubic foot airship have if inflated with pure hydrogen? With pure helium? 47. How much would the lift be reduced for each cubic foot of air in the ballonets, (a) if the airship were inflated with purehydrogen, (b) with pure…
Physics · Military art and science
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