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The submerged
propeller support in the Flying Fish II provided mechanical complexity
and increased drag. The Decavitator shown in the photograph and diagram overcomes
these problems by using a 3 m diameter air propeller to provide the
required thrust for high speed sprints. At low speeds the craft is supported
on the two 5.2 m pontoons, after take-off the two front foils (with surface
followers to control fly-height) and the straight main wing (early V-foil is
shown in the photograph) support the craft. The two front foils provide roll-stability,
and in version IV the main wing pivots to retract the large area
take-off surface and submerge the lower area high speed foil. Roll stability
could also be a problem with the ladder foil as shown in the movie. |
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