Hydrofoil boat

A hydrofoil boat comprising:

• a bottom comprising a front portion, a middle portion, and a rear portion, wherein a front step is formed between the front portion and the middle portion, and a rear step is formed between the middle portion and the rear portion, said front and rear steps extending in a direction perpendicular to a navigating direction and facing a rear end of the boat, where a bottom-centroid is established between said front step and said rearsteps;
• a hydrofoil fully submerging during navigation;
• a retractable strut supporting the hydrofoil and being disposed in the middle portion to prevent lowering trim moment of the boat during navigation;
• and
• a storage recess formed rearward from said rear step for storing said hydrofoil when retracted.

A hydrofoil boat, comprising:

• one front step and one rear step formed in a portion of the boat including at least a lateral middle bottom of the boat;
• a whole-submerged hydrofoil;
• a strut supporting said hydrofoil, wherein said strut is arranged between said two steps;
• a cylinder connected to said hydrofoil;
• a pump connected to said cylinder, wherein said pump inhales and ejects hydraulic oil so as to telescope said cylinder, thereby making said hydrofoil rotate forward and rearward so as to be switched between a storage state and a navigation state;
• and
• an accumulator cylinder connected to said cylinder so as to hold a set value of dynamic lift of said hydrofoil while said hydrofoil is put in said navigation state.

A hydrofoil boat, comprising:

• a bottom comprising a front portion, a middle portion, and a rear portion, wherein said portions each have substantially equal lengths along a longitudinal axis of said bottom;
• one front step and one rear step formed in said middle portion and extending laterally along the bottom;
• a whole-submerged hydrofoil;
• a retractable strut supporting said hydrofoil, wherein said strut is arranged between said front step and said rear step;
• and
• a storage recess formed rearward from said rear step for storing said hydrofoil when retracted, wherein when said hydrofoil is retracted in said storage recess, said strut is substantially concealed between said front step and said rear step as viewed from the side of the boat.

A hydrofoil boat comprising:

• a bottom comprising a front portion, a middle portion, and a rear portion, wherein a front step is formed between the front portion and the middle portion, and a rear step is formed between the middle portion and the rear portion, said front and rear steps extending in a direction perpendicular to a navigating direction and facing a rear end of the boat;
• a hydrofoil fully submerging during navigation;
• a retractable strut supporting the hydrofoil and being disposed in the middle portion to prevent lowering trim moment of the boat during navigation;
• and
• a storage recess formed rearward from said rear step for storing said hydrofoil when retracted, when said hydrofoil is retracted in said storage recess, said strut is substantially concealed between said front step and said rear step as viewed from the side of the boat.

A hydrofoil boat, comprising:

• a bottom comprising a front portion, a middle portion, and a rear portion, wherein said portions each have substantially equal lengths along a longitudinal axis of said bottom;
• one front step and one rear step formed in said middle portion extending laterally along the bottom, wherein a dynamic lift is generated between said front step and said rear step when the boat is navigated;
• a whole-submerged hydrofoil;
• a retractable strut supporting said hydrofoil, wherein said strut is arranged between said front step and said rear step;
• and
• a storage recess formed rearward from said rear step for storing said hydrofoil when retracted.

A hydrofoil boat comprising:

• a bottom comprising a front portion, a middle portion, and a rear portion, wherein a front step is formed between the front portion and the middle portion, and a rear step is formed between the middle portion and the rear portion, said front and rear steps extending in a direction perpendicular to a navigating direction and facing a rear end of the boat, wherein a dynamic lift is generated between said front step and said rear step when the boat is navigated;
• a hydrofoil fully submerging during navigation;
• a retractable strut supporting the hydrofoil and being disposed in the middle portion to prevent lowering trim moment of the boat during navigation;
• and
• a storage recess formed rearward from said rear step for storing said hydrofoil when retracted.