Patent ID: 7707959

Claim:
A boat with a sponson, comprising: a hull sponson provided at an upper end outer periphery of a hull in order to attach a deck constituting an upper part of a boat body to the hull constituting a lower part of the boat body; and a deck sponson provided at an outer periphery of the deck, wherein the deck sponson is overlaid on the hull sponson and bonded, and wherein spray generated as a result of a front section of the boat body colliding with waves is prevented from splashing a deck side while the boat is gliding by making an extent of a projection of a member on the front section of the boat body equal to amount (L 1 ), and by making the extent of the projection of another member at left and right lateral side portions of the boat body equal to amount (L 2 ), wherein the amount (L 1 ) is substantially larger than the amount (L 2 ) in order to reduce the spray at the front section of the boat body, wherein each of the hull sponson and the deck sponson is formed with a downwardly extending section, and wherein a maximum height (H 2 ) of the downwardly extending section at a front section of the hull sponson is larger than height (H 1 ) of the downwardly extending section at left and right lateral side portions of the hull sponson disposed rearwardly of the front section of the hull sponson, the height (H) gradually becoming smaller in a rearward direction from the maximum height (H 2 ) at the front section of the hull sponson so as to have the height (H 1 ) at the left and right lateral side portions of the hull sponson.