Abstract: A lock nut and tang washer mechanism preloads and locks components in a rotating environment. A drive system mechanism preloads and locks the device in a rotating environment and provides a double locking safety requirement needed in most aircraft for applications operating in an enclosed environment. The mechanism holds a required torque for the duration of the drive system operating life without the need for periodic visual inspections.

Abstract: Embodiments of an environmental barrier and seal include physical shields to protect against mechanical damage, labyrinth features to inhibit fluid/particle intrusion, impeller features, and a brush seal. Combinations of these features are presented in various embodiments, specific to particular operating conditions, to create an environmental barrier that protects primary carbon face seals and other shaft seals.

Abstract: A lock nut and tang washer mechanism preloads and locks components in a rotating environment. A drive system mechanism preloads and locks the device in a rotating environment and provides a double locking safety requirement needed in most aircraft for applications operating in an enclosed environment. The mechanism holds a required torque for the duration of the drive system operating life without the need for periodic visual inspections.

Abstract: A lightweight gearbox control mechanism for air cushion vehicles provides change in direction of rotation for the vehicle lift fan and allows the gearbox to be used at port or starboard vehicle locations without the use of specialty tools.

Abstract: A lock nut and tang washer mechanism preloads and locks components in a rotating environment. A drive system mechanism preloads and locks the device in a rotating environment and provides a double locking safety requirement needed in most aircraft for applications operating in an enclosed environment. The mechanism holds a required torque for the duration of the drive system operating life without the need for periodic visual inspections.

Abstract: Embodiments of an environmental barrier and seal include physical shields to protect against mechanical damage, labyrinth features to inhibit fluid/particle intrusion, impeller features, and a brush seal. Combinations of these features are presented in various embodiments, specific to particular operating conditions, to create an environmental barrier that protects primary carbon face seals and other shaft seals.

Abstract: A lock nut and tang washer mechanism preloads and locks components in a rotating environment. A drive system mechanism preloads and locks the device in a rotating environment and provides a double locking safety requirement needed in most aircraft for applications operating in an enclosed environment. The mechanism holds a required torque for the duration of the drive system operating life without the need for periodic visual inspections.

Abstract: A lightweight gearbox control mechanism for air cushion vehicles provides change in direction of rotation for the vehicle lift fan and allows the gearbox to be used at port or starboard vehicle locations without the use of specialty tools.

Abstract: A dual, coaxial rotor helicopter is provided that is relatively easy to fly. Thrust is provided by two ducted fans that are mounted at the rear of the aircraft and spaced apart laterally. Differential thrust generated by the fans provides yaw control for the aircraft, and forward thrust is provided by the fans working in combination. The coaxial rotors are preferably utilized primarily for lift, and not for forward thrust, which simplifies the control requirements. The coaxial rotor with ducted fan configuration also results in lower vibratory loads being imposed on the helicopter, thereby increasing its speed capability. The fan ducts serve to protect the fans, augment the fan thrust at low airspeeds, increase the efficiency of the fans at cruise speeds, and provide horizontal and vertical stabilizing surfaces to ensure aircraft flight stability.

Abstract: A dual, coaxial rotor helicopter is provided that is relatively easy to fly. Thrust is provided by two ducted fans that are mounted at the rear of the aircraft and spaced apart laterally. Differential thrust generated by the fans provides yaw control for the aircraft, and forward thrust is provided by the fans working in combination. The coaxial rotors are preferably utilized primarily for lift, and not for forward thrust, which simplifies the control requirements. The coaxial rotor with ducted fan configuration also results in lower vibratory loads being imposed on the helicopter, thereby increasing its speed capability. The fan ducts serve to protect the fans, augment the fan thrust at low airspeeds, increase the efficiency of the fans at cruise speeds, and provide horizontal and vertical stabilizing surfaces to ensure aircraft flight stability.

Abstract: The novel portable ice walking assistance device comprises a plurality of main horizontal plates. Each of the plates have foldable vertical end pieces at one end of the main horizontal plates. The main plates are attached together to form a three sided device that can be positioned on the sole of the user's shoe. A pair of the devices is used by an individual. Each of the horizontal plates have a plurality of small vertical prongs to assist in the gripping capability in ice conditions. A quick release mechanism is connected to one of the vertical end pieces to permit attaching to the shoe and ease of release of the device.