Surfboard with air-film creating vents

摘要

An air vent that passes from the deck of a surfboard through to its bottom. The vent may have a wide variety of shapes. The trailing boundary of the vent's lower portion is preferably inclined forward toward the surfboard's nose. The inclination serves to prevent water flowing upward. Instead, air is entrained by the water flowing across the vent's bottom exit and pulled downward. A portion of the entrained air flows rearward out of the bottom exit along the surfboard's bottom. This entrained air forms an air film between the board's bottom and the surrounding water, thereby reducing friction.

主权项

1. A surfboard comprising:
a. a deck; b. a bottom; c. a tail; d. a vent passing from said deck to said bottom, said vent including,
i. a top exit connecting said vent to said deck,ii. a bottom exit connecting said vent to said bottom, said bottom exit including a leading boundary and a trailing boundary,iii. said trailing boundary having an upper extreme and a lower extreme, andiv. wherein said lower extreme of said trailing boundary is closer to said tail than said upper extreme.