초록 ▼

A small boat has left and right sponsons extending in a longitudinal direction and respectively attached to left and right side walls forming a boat body. The sponsons are provided with an attachment section contacting a left side wall, a gliding section extending substantially horizontally from a l

A small boat has left and right sponsons extending in a longitudinal direction and respectively attached to left and right side walls forming a boat body. The sponsons are provided with an attachment section contacting a left side wall, a gliding section extending substantially horizontally from a lower edge of the attachment section, an inclined section connecting to a side edge of the gliding section, an upper edge of the attachment section, and projecting sections extending from an upper edge to a lower edge of the inclined section. Water flowing along the inclined section is guided by the projection sections and removed or separated from the inclined section. Accordingly, a small boat that turns through a small arc turning locus is provided, e.g., a small boat that is capable of relatively tight turning.

대표청구항 ▼

What is claimed is: 1. A watercraft comprising: a boat body having left and right side walls extending longitudinally from a front and a rear portion of the boat body; a right side sponson extending longitudinally along the right side wall; and a left side sponson extending longitudinally along the

What is claimed is: 1. A watercraft comprising: a boat body having left and right side walls extending longitudinally from a front and a rear portion of the boat body; a right side sponson extending longitudinally along the right side wall; and a left side sponson extending longitudinally along the left side wall, wherein said left and right sponsons include: attachment sections contacting the respective side walls, runner sections projecting substantially horizontally from a lower edge of the attachment sections, inclined sections connecting to a side edge of the runner sections and an upper edge of the attachment sections, and at least one projection section projecting upwardly from the inclined sections, wherein water flowing along the inclined sections separates from the inclined sections by being guided by the projecting sections, and wherein the at least one projection section includes three separate and longitudinally spaced apart projection sections on each of said right and left sponson. 2. The watercraft according to claim 1, wherein the inclined sections are inclined at a downward gradient towards a lower edge of the inclined sections from an upper edge of the inclined sections. 3. The watercraft according to claim 2, wherein the projection section is formed projecting so as to extend rearwardly from an upper edge of the inclined sections toward a lower edge of the inclined sections. 4. The watercraft according to claim 3, wherein the three projection sections are provided between a front end and a rear end of each of said sponsons, said three projection sections including a forwardmost projection section, a rearwardmost projection section, and a middle projection section. 5. The watercraft according to claim 4, wherein the forwardmost projection section of said three projection sections on each of said sponsons is smaller in size than said rearwardmost projection section. 6. The watercraft according to claim 1, wherein the projection section is formed projecting so as to extend rearwardly from an upper edge of the inclined sections toward a lower edge of the inclined sections. 7. The watercraft according to claim 6, wherein the three projection sections are provided between a front end and a rear end of each of said sponsons, said three projection sections including a forwardmost projection section, a rearwardmost projection section, and a middle projection section. 8. The watercraft according to claim 7, wherein the forwardmost projection section of said three projection sections on each of said sponsons is smaller in size than said rearwardmost projection section. 9. The watercraft according to claim 1, wherein the at least one projection section is a raised rib extending outwardly from an outer surface of the respective right and left sponson. 10. The watercraft according to claim 1, wherein each of said sponsons is attached to the respective side wall with attachment members, and the projection section is provided on said respective sponson in a position that does not interfere with said attachment members. 11. A sponson of a watercraft, said sponson comprising: an attachment section capable of contacting a respective side wall of the watercraft, a runner section projecting substantially horizontally from a lower edge of the attachment section, an inclined section connected to a side edge of the runner section and an upper edge of the attachment section, and at least one projection section projecting upwardly from the inclined section, wherein said at least one projection section is a raised rib extending rearwardly and at an angle with respect to a longitudinal waterline of said sponson, and wherein the at least one projection section includes three separate and longitudinally spaced apart projection sections. 12. The sponson according to claim 11, wherein the inclined section is inclined at a downward gradient toward a lower edge of the inclined section from an upper edge of the inclined section. 13. The sponson according to claim 12, wherein the projection section is formed projecting so as to extend rearwardly from an upper edge of the inclined section toward a lower edge of the inclined section. 14. The sponson according to claim 11, further including a recessed area for an attachment member, said recessed area being provided in a position between adjacent projection sections. 15. The sponson according to claim 11, wherein a plurality of the projection sections are provided between a front end and a rear end of said sponson, said projection sections including a forwardmost projection section and a rearwardmost projection section. 16. The sponson according to claim 15, wherein the forwardmost projection section of said plurality of projection sections on each of said sponsons is smaller in size than said rearwardmost projection section. 17. A sponson for a watercraft, said sponson comprising: an attachment section capable of contacting a respective side wall of the watercraft, a runner section projecting substantially horizontally from a lower edge of the attachment section, an inclined section connected to a side edge of the runner section and an upper edge of the attachment section, a plurality of separate and longitudinally spaced apart projection sections projecting upwardly from the inclined section, and a recessed area on the inclined section for an attachment member, said recessed area being provided in a position between adjacent projection sections, wherein each of said plurality of separate and longitudinally spaced apart projecting sections is a raised rib extending rearwardly and at an angle with respect to a longitudinal waterline of said sponson.