Abstract: An acoustic window for passage of desired acoustic waveforms therethrough is provided. The acoustic window includes at least a pair of structural septa. At least one core layer is sandwiched between the septa and includes a cellular reinforcement and transmission medium encapsulating the cellular reinforcement. The acoustic window may be included on the hull of a surface or submergible vessel, in order to provide a hydrodynamic fairing over sonar or other acoustic equipment.

Abstract: An acoustic window for passage of desired acoustic waveforms therethrough is provided. The acoustic window includes at least a pair of structural septa. At least one core layer is sandwiched between the septa and includes a cellular reinforcement and transmission medium encapsulating the cellular reinforcement. The acoustic window may be included on the hull of a surface or submergible vessel, in order to provide a hydrodynamic fairing over sonar or other acoustic equipment.

Abstract: A suspension system for a vehicle includes a frame, a wheel support member, a leaf spring secured to the wheel support member, a first connector for first pivotally connecting one end of the leaf spring to the frame, a torsion spring having a central shaft, an outer housing and an elastomer disposed between the central shaft and the housing, and a lever for pivotally interconnecting the central shaft with the other end of the leaf spring. The torsion spring is located between the leaf spring and the frame so that compression of the leaf spring causes the lever to be displaced rotationally toward the vehicle frame.