Boat with hydrofoils

Abstract

A boat includes a hull (2), a hydrofoil (301, 601) mounted to the hull (2) by means of a hydrofoil holding arrangement (302) that has a strut (3021, 503). The boat also includes a strut adjustment arrangement (310, 510) arranged to retract the strut (3021, 503) from an extended position to a retracted position so as to move the hydrofoil (301, 601) from a deployed position to a restrained position, and/or to lock the strut in the extended position and/or in the retracted position. At least a portion of the strut has a hydrodynamic portion forming a leading edge (5036) and a blunt trailing edge (5037), where a sheltered portion (5101′, 5104, 5108) of the strut adjustment arrangement is positioned.

1 . A boat comprising
 a hull,   a first hydrofoil mounted to the hull by means of a first hydrofoil holding arrangement,   a second hydrofoil mounted to the hull by means of a second hydrofoil holding arrangement comprising a strut which is separate from the first hydrofoil holding arrangement, the strut being arranged to extend at least partly downwards from the hull, the second hydrofoil being fixed to the strut,   a torque generating assembly, and   a propeller arrangement arranged to be driven by the torque generating assembly,   wherein the propeller arrangement is mounted to the strut,   wherein the strut is arranged to be retracted from an extended position to a dry position in which the propeller arrangement and the second hydrofoil are above the water surface when the boat is floating at rest, wherein the arrangement of the strut to be retracted from the extended position to the dry position comprises the strut being arranged to be moved along a longitudinal axis of the strut.   
     
     
         2 . A boat according to  claim 1 , wherein the strut is arranged to be retracted from the extended position to a retracted position so as to move the propeller arrangement from a deployed position to a restrained position, in which restrained position the propeller arrangement is positioned to be submerged in water carrying the boat, wherein the propeller arrangement is, in the deployed position, located further down than in the restrained position, wherein, in the extended position as well as in the retracted position, the strut, with the propeller arrangement, is arranged to be turned in relation to the hull so as to steer the boat. 
     
     
         3 . A boat according to  claim 1 , wherein the second hydrofoil is fixed to the strut at a position along a longitudinal extension of the strut being within an extension of the propeller arrangement along the longitudinal extension of the strut. 
     
     
         4 . A boat comprising
 a hull,   a first hydrofoil mounted to the hull by means of a first hydrofoil holding arrangement,   a second hydrofoil mounted to the hull by means of a second hydrofoil holding arrangement comprising a strut which is separate from the first hydrofoil holding arrangement, the strut being arranged to extend at least partly downwards from the hull, the second hydrofoil being fixed to the strut,   a torque generating assembly, and   a propeller arrangement arranged to be driven by the torque generating assembly,   wherein the propeller arrangement is mounted to the strut,   wherein the strut is arranged to be retracted from an extended position to a retracted position so as to move the propeller arrangement ( 5011 ,  5012 ) from a deployed position to a restrained position, in which restrained position the propeller arrangement is positioned to be submerged in water carrying the boat, wherein the propeller arrangement is, in the deployed position, located further down than in the restrained position,   wherein, in the extended position as well as in the retracted position, the strut, with the propeller arrangement ( 5011 ,  5012 ), is arranged to be turned in relation to the hull so as to steer the boat,   wherein the first hydrofoil holding arrangement for mounting the first hydrofoil to the hull is arranged to be retracted from an extended position to a retracted position so as to move the first hydrofoil from a deployed position to a restrained position, wherein the first hydrofoil is, in the deployed position, located further down than in the restrained position,   wherein the first hydrofoil is in the restrained position arranged to be submerged.