Abstract
Archimedes principle states that for a body to float it must displace a volume of water equal to its mass. If the body is driven forward, it must move aside that water volume. As the water flows around the surface of the body forces are generated, both by friction against the body surface and by inertial forces generated by acceleration around the body shape.
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Notes
- 1.
Froude number Fn can be defined two ways FnL = V/(g L)0.5 or Fn∇ = V/(g(Displacement volume)0.33)0.5.
- 2.
In Russia a ‘captured air bubble’ is referred to as an ‘artificial cavity’. Where a craft has a cavity shape at the base of the hull the concepts discussed here are all fed with air at some pressure, and there is an outflow at the stern depending on speed. In this book we generally refer to this operational system as an ‘air cavity’.
- 3.
Ps is power measured in metric horsepower where 1 ps = 0.735 kW
- 4.
In Russia pressurized air cavities under a hull are referred to as ‘artificial air cavities’ to distinguish them from cavities formed from natural cavitation due to suction pressure on the convex surfaces of propeller blades or hydrofoils.
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Pavlov, G.A., Yun, L., Bliault, A., He, SL. (2020). Introduction. In: Air Lubricated and Air Cavity Ships. Springer, New York, NY. https://doi.org/10.1007/978-1-0716-0425-0_1
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