41. Similar, related sports are wakeboarding, tubing, and sit-down hydrofoil . 42. Each yacht employed hydrofoils and a wing sail. 43. Foils of similar function designed with water as the working fluid are called hydrofoils . 44. The yacht is a hydrofoil craft purchased with SPECTRE funds for ?00, 000. 45. Boeing has designed and built several hydrofoil craft for both military and civilian use. 46. They are also dissimilar from hovercraft or hydrofoils . 47. Narrow-bodied fish use their fins as hydrofoils while their bodies remain horizontal. 48. Boeing launched its first passenger-carrying waterjet-propelled hydrofoil in April 1974. 49. On June 15 the hydrofoil crossings are expected to be increased to two a day. 50. Wider adoption of hydrofoils is prevented by the increased complexity of building and maintaining them.
