Ground-effect vehicle capable of shallow diving
A ground-effect aircraft and aircraft technology, applied to aircraft, seaplanes, convertible vehicles, etc., can solve problems such as pump flow, complex dynamic characteristics, difficult research results, and complex structures
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[0033] 5.1 Assume that the underwater displacement of the aircraft is 40 tons, the driving power provided by the water pump is 170 horsepower, and the maximum underwater speed is 25 knots, which is equivalent to V=25×1.852=46.25km / h=12.815m / s. In order to overcome the underwater resistance during shallow diving, according to Newton's third law, the thrust is equal to the resistance and advances at a constant speed. The thrust of the water is: F=75N / V=75×170 / 12.85=992.2kgf=0.992 tons≈1 ton force. Obtain thrust-to-weight ratio γ=1 / 40 for diving voyage, and γ=1 / 4 for fighter jet cruising, both belong to different technical fields, and the natural thrust-weight ratio of submersible is lower, and the difference between the two is as much as 10 times.
[0034] 5.2 This pump is a gear pump. The commonly used working pressure in engineering is P=12~20Mpa, which is used for oil. Now the water pressure is lower, so take P=7.5Mpa=75kgf / cm 2 . The total efficiency of the gear pump is y =...
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