Hydrofoil watercraft and method of manufacture of the same

A hydrofoil board comprising:

• a body, the body having a deck surface configured to support a rider, and a bottom surface opposite the deck surface, the body comprising:
• a fore portion toward a front end of the hydrofoil board, the fore portion forming a hull and having a planing surface upon which the hydrofoil board planes atop a surface of a body of water, the planing surface forming part of the bottom surface of the body;
• and
• an aft portion toward a rear end of the hydrofoil board, the aft portion extending from the fore portion, the aft portion having an aft bottom surface forming part of the bottom surface of the body, the aft portion being configured to mount a hydrofoil assembly on or through the aft bottom surface;
• wherein the deck surface is substantially even across the fore portion and the aft portion of the body;
• wherein the aft bottom surface and the planing surface are on uneven planes such that an aft cross-sectional thickness between the deck surface and the aft bottom surface is less than a fore cross-sectional thickness between the deck surface and the planing surface;
• wherein the planing surface of the fore portion terminates at a step transition disposed between the fore portion and the aft portion, wherein the step transition forms a transition surface connecting the aft bottom surface to the planing surface, the transition surface forming part of the bottom surface;
• and
• wherein the bottom surface has a bottom surface area, the bottom surface area including a fore surface area of the planing surface, an aft surface area of the aft bottom surface, and a transition surface area of the transition surface, and wherein the fore surface area is about two thirds of the bottom surface area.

A hydrofoil board comprising:

• a body, the body having a deck surface configured to support a rider, and a bottom surface opposite the deck surface, the body comprising:
• a fore portion toward a front end of the hydrofoil board, the fore portion forming a hull and having a planing surface upon which the hydrofoil board planes atop a surface of a body of water, the planing surface forming part of the bottom surface of the body;
• and
• an aft portion toward a rear end of the hydrofoil board, the aft portion extending from the fore portion, the aft portion having an aft bottom surface forming part of the bottom surface of the body, the aft portion being configured to mount a hydrofoil assembly on or through the aft bottom surface;
• wherein the deck surface is substantially even across the fore portion and the aft portion of the body;
• wherein the aft bottom surface and the planing surface are on uneven planes such that an aft cross-sectional thickness between the deck surface and the aft bottom surface is less than a fore cross-sectional thickness between the deck surface and the planing surface;
• and
• wherein the body has a volume, and the fore portion forms approximately five eighths of the volume of the body.

A hydrofoil board comprising:

• a body, the body having a deck surface configured to support a rider, and a bottom surface opposite the deck surface, the body comprising:
• a fore portion toward a front end of the hydrofoil board, the fore portion forming a hull and having a planing surface upon which the hydrofoil board planes atop a surface of a body of water, the planing surface forming part of the bottom surface of the body;
• and
• an aft portion toward a rear end of the hydrofoil board, the aft portion extending from the fore portion, the aft portion having an aft bottom surface forming part of the bottom surface of the body, the aft portion being configured to mount a hydrofoil assembly on or through the aft bottom surface;
• wherein the deck surface is substantially even across the fore portion and the aft portion of the body;
• wherein the aft bottom surface and the planing surface are on uneven planes such that an aft cross-sectional thickness between the deck surface and the aft bottom surface is less than a fore cross-sectional thickness between the deck surface and the planing surface;
• and
• wherein the fore portion comprising approximately five eighths of an overall length of the body.

A hydrofoil board comprising:

• a body, the body having a deck surface configured to support a rider, and a bottom surface opposite the deck surface, the body comprising:
• a fore portion toward a front end of the hydrofoil board, the fore portion forming a hull and having a planing surface upon which the hydrofoil board planes atop a surface of a body of water, the planing surface forming part of the bottom surface of the body;
• and
• an aft portion toward a rear end of the hydrofoil board, the aft portion extending from the fore portion, the aft portion having an aft bottom surface forming part of the bottom surface of the body, the aft portion being configured to mount a hydrofoil assembly on or through the aft bottom surface;
• wherein the deck surface is substantially even across the fore portion and the aft portion of the body;
• wherein the aft bottom surface and the planing surface are on uneven planes such that an aft cross-sectional thickness between the deck surface and the aft bottom surface is less than a fore cross-sectional thickness between the deck surface and the planing surface;
• and
• wherein the fore cross-sectional thickness is about three times as thick as the aft cross-sectional thickness.

A method of manufacture of a hydrofoil board, the method comprising:

• determining a volume of a body of the hydrofoil board, the body having a deck surface configured to support a rider, and a bottom surface opposite the deck surface;
• forming a fore portion of the body toward a front end of the hydrofoil board based on the volume, the fore portion having more than two thirds of the volume of the body, the fore portion forming a hull and having a planing surface upon which the hydrofoil board planes atop a surface of a body of water, the planing surface forming part of the bottom surface of the body;
• forming an aft portion of the body extending from the fore portion toward a rear end of the hydrofoil board based on the volume, the aft portion having an aft bottom surface forming part of the bottom surface of the body, the aft portion being configured to mount a hydrofoil assembly on or through the aft bottom surface;
• forming the deck surface substantially even across the fore portion and the aft portion of the body;
• forming the aft bottom surface and the planing surface on uneven planes such that an aft cross-sectional thickness between the deck surface and the aft bottom surface is less than a fore cross-sectional thickness between the deck surface and the planing surface;
• and
• forming a step transition between the fore portion and the aft portion, the step transition including a transition surface connecting the aft bottom surface to the planing surface, the transition surface forming part of the bottom surface;
• wherein the step transition bridges an offset distance between the aft bottom surface and the planing surface;
• and
• wherein the offset distance is in a range of 10 to 15 centimeters.

A method of manufacture of a hydrofoil board, the method comprising:

• determining a volume of a body of the hydrofoil board, the body having a deck surface configured to support a rider, and a bottom surface opposite the deck surface;
• forming a fore portion of the body toward a front end of the hydrofoil board based on the volume, the fore portion having more than two thirds of the volume of the body, the fore portion forming a hull and having a planing surface upon which the hydrofoil board planes atop a surface of a body of water, the planing surface forming part of the bottom surface of the body;
• forming an aft portion of the body extending from the fore portion toward a rear end of the hydrofoil board based on the volume, the aft portion having an aft bottom surface forming part of the bottom surface of the body, the aft portion being configured to mount a hydrofoil assembly on or through the aft bottom surface;
• forming the deck surface substantially even across the fore portion and the aft portion of the body;
• forming the aft bottom surface and the planing surface on uneven planes such that an aft cross-sectional thickness between the deck surface and the aft bottom surface is less than a fore cross-sectional thickness between the deck surface and the planing surface;
• and
• forming a step transition between the fore portion and the aft portion, the step transition including a transition surface connecting the aft bottom surface to the planing surface, the transition surface forming part of the bottom surface;
• wherein the bottom surface has a bottom surface area, the bottom surface area including a fore surface area of the planing surface, an aft surface area of the aft bottom surface, and a transition surface area of the transition surface, and wherein the fore surface area is about two thirds of the bottom surface area.