Abstract: An airborne tugboat with three hulls (4): an underbody (4), surface body (5) and inflatable body (6). When stationed on shore the inflatable body is not activated, but is folded up against the surface body. Gas turbine (1) drives the propeller (3) via the reduction gear (2). The rotatable ring (8) round the propeller makes the airborne tugboat maneuverable, and when the disabled ship is towed, it will be able to influence towing direction without the risk of the airborne tugboat heeling over. By its design the airborne tugboat should be regarded as a slow-moving towing boat where the speed is low but the power in the towing direction is great. The design is characterised by low weight in all machinery and equipment. The amount of fuel restricts the operating time, but the helicopter and airborne tugboat, for example, use the same fuel, thus providing the advantage that the helicopter can refuel the airborne tugboat before it returns to base.

Abstract: An airborne tugboat with three hulls (4): an underbody (4), surface body (5) and inflatable body (6). When stationed on shore the inflatable body is not activated, but is folded up against the surface body. Gas turbine (1) drives the propeller (3) via the reduction gear (2). The rotatable ring (8) round the propeller makes the airborne tugboat maneuverable, and when the disabled ship is towed, it will be able to influence towing direction without the risk of the airborne tugboat heeling over. By its design the airborne tugboat should be regarded as a slow-moving towing boat where the speed is low but the power in the towing direction is great. The design is characterised by low weight in all machinery and equipment. The amount of fuel restricts the operating time, but the helicopter and airborne tugboat, for example, use the same fuel, thus providing the advantage that the helicopter can refuel the airborne tugboat before it returns to base.