An air supported vessel comprising the following features, - a V-shaped hull (0.0) - with a starboard keel part (2.1.S) and a port keel part (2.1.B), and - with a V-shaped bow (3.0), comprising an outer bow bearing surface (3.3), - where the V-shaped hull (0.0) has at least one air supported chamber (5.0) in a part of the V-shaped hull's (0.0) length below a waterline, - the at least one air supported chamber (5.0) is delimited by an air supported chamber ceiling (5.1), air supported chamber starboard and port side walls (5.2.S, 5.2.B) and with at least one aft closing device (7.0) with aft threshold (7.1) which forms an aft boundary of the at least one air supported chamber (5.0) and with at least one air support chamber air intake (5.3) which together with the side walls of the at least one air supported chamber in the bow (5.4) form a front boundary of the at least one air supported chamber (5.0), wherein the V-shaped bow (3.0) further comprises a bow step (3.1) with a bow step threshold (3.2), which extends from a starboard longitudinal keel step (2.2.S) around the V-shaped bow ( 3.0) to a port longitudinal keel step (2.2.B), and forms a lower boundary of the air supported chamber sidewalls in the bow (5.4), to reduce air leakage below a bow base line (BBL), characterised by - a transverse step at an aft part of the bow base line (BBL), comprising a starboard transverse step (4.0.S) and a port transverse step (4.0.B), where the starboard keel part (2.1.S ) with a starboard keel line (KL.S) and the port keel part (2.1.B) a the port keel line (KL.B) have greater draft than the V-shaped bow (3.0) with the bow base line (BBL) at the starboard transverse step (4.0.S) and the port transverse step (4.0.B). - a V-shaped hull (0.0) - with a starboard keel part (2.1.S) and a port keel part (2.1.B), and - with a V-shaped bow (3.0), comprising an outer bow bearing surface (3.3), - where the V-shaped hull (0.0) has at least one air supported chamber (5.0) in a part of the V-shaped hull's (0.0) length below a waterline, - the at least one air supported chamber (5.0) is delimited by an air supported chamber ceiling (5.1), air supported chamber starboard and port side walls (5.2.S, 5.2.B) and with at least one aft closing device (7.0) with aft threshold (7.1) which forms an aft boundary of the at least one air supported chamber (5.0) and with at least one air support chamber air intake (5.3) which together with the side walls of the at least one air supported chamber in the bow (5.4) form a front boundary of the at least one air supported chamber (5.0), wherein the V-shaped bow (3.0) further comprises a bow step (3.1) with a bow step threshold (3.2), which extends from a starboard longitudinal keel step (2.2.S) around the V-shaped bow ( 3.0) to a port longitudinal keel step (2.2.B), and forms a lower boundary of the air supported chamber sidewalls in the bow (5.4), to reduce air leakage below a bow base line (BBL), characterised by wherein the V-shaped bow (3.0) further comprises a bow step (3.1) with a bow step threshold (3.2), which extends from a starboard longitudinal keel step (2.2.S) around the V-shaped bow ( 3.0) to a port longitudinal keel step (2.2.B), and forms a lower boundary of the air supported chamber sidewalls in the bow (5.4), to reduce air leakage below a bow base line (BBL), characterised by - a transverse step at an aft part of the bow base line (BBL), comprising a starboard transverse step (4.0.S) and a port transverse step (4.0.B), where the starboard keel part (2.1.S ) with a starboard keel line (KL.S) and the port keel part (2.1.B) a the port keel line (KL.B) have greater draft than the V-shaped bow (3.0) with the bow base line (BBL) at the starboard transverse step (4.0.S) and the port transverse step (4.0.B). <EOS>