Method and apparatus for reducing drag on a moving body

Details Method and apparatus for reducing drag on a moving body Method and apparatus for reducing drag on a moving body

1996-05-28

1998-04-21

Sotelo, Jesus D.

Ships

Building

Antifriction surfaces

440 13, B63B 134

Patent

active

057407509

ABSTRACT:
A method and apparatus for providing reduced drag on a body moving in a direction D through a selected fluid medium at a speed U which is normally sufficient to cause turbulence. Reduced drag is generally accomplished by flexing at least the outer surface of at least the rear third of the body to produce a wave-like motion of the body having a wavelength of between 0.5 and 2.0 times the length of the body, a reduced frequency value .OMEGA. between 0.1 and 0.5 and a time delay between successive points on the body reaching peaks for their flex motion which is directly proportional to the distance x.sub.i in the direction D of the point from a reference point on the body and inversely proportional to the phase speed c.sub.p of the wave. A variety of techniques are described for achieving the desired wave-like motion.

REFERENCES:
patent: 1458844 (1923-06-01), Perkins
patent: 2936729 (1960-05-01), Kuttner
patent: 5359574 (1994-10-01), Nadolink
patent: 5401196 (1995-03-01), Triantafyllou
M.S. Triantafyllou et al,"An Efficient Swimming Machine", Mar. 1995, vol. 272, No. 3, pp. 1-8, Scientific American.

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