PURPOSE: To hold the wing with comfortable attitude, by coupling the both end sections of an auxiliary keel to both end sections of the keel.
CONSTITUTION: The person riding on a board 11 will hold the wing 1 to receive the wind to sail on the water. The wing 1 is comprised of triangular canvas 21, 22 stretched across both side sections of the keel 2, a pair of spurs 3 for holding one sides of each canvas 21, 22 coupled to one end of the keel 2, a spreader 4 coupled between both spurs 3 for maintaining the angle between both spurs 3 constant and a strut 5 coupled between them for maintaining the angle between both spurs 3 an the keel 2 constant. Furthermore a coupling tool 90 is secured in the vicinity of both end sections of the keel 2 to which a curved auxiliary keel 9 are coupled.
IWAHASHI ATSUSHI
NIIJIMA MITSUHARU
