Deployable apparatus to prevent helicopter rollover

An aircraft comprising:

• a plurality of float kits comprising air bladders that deploy around the aircraft upon a water landing, wherein the air bladders support the aircraft in the water;
• and
• a deployable keel affixed by a first end to the aircraft and capable of deployment substantially perpendicular to a longitudinal axis and opposite a rotor of the aircraft upon a water landing, wherein the keel is sized to prevent aircraft rollover and wherein the keel is defined further as comprising a support and fabric, wherein the fabric deploys between the support and the aircraft.

A method of preventing aircraft rollover upon a water landing of an aircraft that is supported by a plurality of float kits of the aircraft, the method comprising:

• selecting a sea state and an aircraft;
• and
• sizing a deployable keel affixed by a first end to the aircraft and capable of deployment substantially perpendicular to a longitudinal axis and opposite a rotor of the aircraft upon a water landing, wherein the keel is sized to prevent aircraft rollover upon deployment, and wherein the keel is defined further as comprising a support and fabric, and deploying the fabric between the support and the aircraft.