multiblade propeller

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Single-blade propeller — A single blade propeller is a notable configuration of a propulsion system used on aerodynes to generate thrust. Normally propellers are multiblades. The simplicity of a single blade propeller fits very well on motorized gliders, because it… … Wikipedia
Water tunnel (hydrodynamic) — A water tunnel is an experimental facility used for testing the hydrodynamic behavior of submerged bodies in flowing water. It is very similar to a recirculating wind tunnel but with water as the working fluid, and related phenomena are… … Wikipedia

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