Abstract: A disintegrable projectile is disclosed which utilizes thermal energy obted from the conversion of the kinetic energy of the air moving past the projectile to cause its fragmentation. The projectile employs an air intake nozzle axially disposed in the nose portion of the projectile and a resonance tube located in the body portion of the projectile in thermal contact therewith. The resonance tube develops the thermal energy which is transmitted to the body portion to cause the fragmentation thereof. The projectile of the present invention is intended for use in gunnery training and practice conducted within limited size training and practice ranges, where civilian personnel and property may be in proximate location.

Abstract: An improved buffer for small arm weapons utilizes a pair of fluid containing reciprocating chambers to attenuate recoil forces by limiting fluid flow in relation to chamber travel between the pair. In the second chamber of the pair a flow control element moves in the direction of a restricting member when the fluid pressure drop through the flow control element reaches a predetermined point. The flow restricting member limits fluid flow through the flow control element when the flow control element travels to a point proximate the flow restricting member. Fluid flow in the opposite direction is substantially unrestricted by the flow restricting members.

Abstract: A disintegrable projectile is disclosed which utilizes thermal energy obted from the conversion of the kinetic energy of the air moving past the projectile to cause its fragmentation. The projectile employs an air intake nozzle axially disposed in the nose portion of the projectile and a resonance tube located in the body portion of the projectile in thermal contact therewith. The resonance tube develops the thermal energy which is transmitted to the body portion to cause the fragmentation thereof. The projectile of the present invention is intended for use in gunnery training and practice conducted within limited size training and practice ranges, where civilian personnel and property may be in proximate location.

Abstract: A fatigue cycle sensor can integrate force with respect to time. The sensor has a body with a bore. A plunger is mounted in the bore for relative motion therethrough in response to force applied behind the plunger. The plunger is sized for an interference fit in the bore. This interference fit results in deformation in response to relative motion between the plunger and body. The foregoing sensor has many applications including estimating fatigue in weapons.

Abstract: A weapon is provided with means to buffer the recoil which is produced when the weapon is fired. The buffer includes a fluidic device having a first and a second chamber. During recoil, a compressive force is applied to the fluid in the first chamber and flow from the first chamber to the second chamber is restricted by a fluidic diode in relationship to the pressure differential between the first and second chamber. On counter recoil, the fluid flows from the second chamber to the first chamber in an essentially unrestricted manner. The level of flow restriction by the fluidic diode is greater at high pressure differentials than at low pressure differentials.

Abstract: A split-ring hermetically sealed pressure enclosure is positioned around a ap formed between a shell body and base plate of a projectile for the purpose of measuring an unknown gap volume and comparing it to a standard acceptable volume. The system utilizes a gauging system which pressurizes both the known volume of the standard volume and unknown volume of the test body simultaneously and then measures the rate at which each volume is depleted. Fluidic sensing, amplifying, and gating systems are utilized for generating an output signal responsive to comparative pressure rate changes of both standard and test volumes. The output signal is used to operate a visual, biased, no-go, go pneumatic indicator.

Abstract: A fluidic logic circuit is used to control access to a secured area by receiving pneumatic signals from a fluidic signal input transducer determining whether or not specific coded input requirements have been met. When all inputs to the signal input transducer are correct the fluidic logic circuit applies fluidic signals to valving which in turn provides fluid power to pneumatically operated latching devices. When one or more incorrect inputs from the signal input transducer are received by the fluidic logic, a dual signal is initiated by the fluidic logic which shuts off the power supply valve and prevents opening of the pneumatic latch.