A pod assembly which includes a pod and an inertial measurement unit positioned within the pod. The pod assembly further includes deceleration hardware associated with the pod. A method for using a pod assembly, includes a step of securing the pod assembly, which includes a pod and an inertial measurement unit contained within the pod, to an aircraft and a step of operating the aircraft with the inertial measurement unit operating sensing movement and alignment of the pod and storing data corresponding to the sensed movement and alignment of the pod on a data collection assembly connected to the inertial measurement unit. The method further includes a step of releasing the pod assembly from the aircraft and a step of utilizing deceleration hardware associated with the pod to reduce rate of descent of the pod assembly released from the aircraft.

Embodiments of the present disclosure include a bowfishing slide arrangement for use with an archery bow. In certain embodiments, the arrangement includes a slide having a slide body configured to slide along an arrow shaft. The arrangement further includes a stop used in cooperation with the slide. The stop is arrangeable on the arrow shaft in a manner to prevent the slide from sliding off of the arrow shaft. A dampening material is secured to the rear of the slide and arranged between the slide and the stop.

Embodiments of the present disclosure include a bowfishing slide arrangement for use with an archery bow. In certain embodiments, the arrangement includes a slide having a slide body configured to slide along an arrow shaft. The arrangement further includes a stop used in cooperation with the slide. The stop is arrangeable on the arrow shaft in a manner to prevent the slide from sliding off of the arrow shaft. A dampening material is secured to the rear of the slide and arranged between the slide and the stop.

A bullet whose aerodynamics is suitable for stable subsonic flight, including a parabolic or hemispherical nose section, cylindrical midsection, and a parabolic into conical tail section. It is constructed of a copper shell filled, in the tail, with a material having a density less than or equal to 3.0 g/cm.sup.3, and in the nose with a material having a density greater than or equal to 11 g/cm.sup.3. The bullet further includes a length sufficient to fill an appropriate standard casing combined with the proper amount of smokeless powder for subsonic flight. These characteristics allow for the bullet's stable and accurate flight at speeds below 343.2 m/s.

Ammunition cartridge including a rigid casing including a tubular sleeve and a base closing an end of the casing, a projectile mounted at another end of the casing, a propellant charge contained inside the casing, and an ignition device. The projectile includes a solid material body having a volume V1 extending between a tip to a trailing end, wherein the projectile further includes a cavity that extends into the body from the trailing end, a volume V2 of the cavity being at least fifteen percent (15%) of a combined volume V1+V2 of the projectile solid material and cavity: V2>0.15(V1+V2).

Ammunition cartridge including a rigid casing including a tubular sleeve and a base closing an end of the casing, a projectile mounted at another end of the casing, a propellant charge contained inside the casing, and an ignition device. The projectile includes a solid material body having a volume V1 extending between a tip to a trailing end, wherein the projectile further includes a cavity that extends into the body from the trailing end, a volume V2 of the cavity being at least fifteen percent (15%) of a combined volume V1+V2 of the projectile solid material and cavity: V2>0.15(V1+V2).

A system for actuating a safety control for a device including: (1) at least one sensor adapted to measure a parameter of the device and provide an output; (2) a Kalman filter adapted to receive the output of the at least one sensor and provide a state estimate and covariance value of the device; (3) a Lyapunov function adapted to receive the state estimate and covariance value from the Kalman filter and provide a time derivative; and (4) a comparator adapted to compare the time derivative to a reference value and provide a command decision to the device.

A system for actuating a safety control for a device including: (1) at least one sensor adapted to measure a parameter of the device and provide an output; (2) a Kalman filter adapted to receive the output of the at least one sensor and provide a state estimate and covariance value of the device; (3) a Lyapunov function adapted to receive the state estimate and covariance value from the Kalman filter and provide a time derivative; and (4) a comparator adapted to compare the time derivative to a reference value and provide a command decision to the device.

A projectile capable of carrying and delivering a payload includes an impact attenuation system that deploys prior to impact with the ground to safely deliver the payload. The impact attenuation system can comprise bags that inflate prior to impact. The bags can have an asymmetrical or irregular shape such that, combined with a coloring or certain visual designs, it can blend into the environment.

A projectile capable of carrying and delivering a payload includes an impact attenuation system that deploys prior to impact with the ground to safely deliver the payload. The impact attenuation system can comprise bags that inflate prior to impact. The bags can have an asymmetrical or irregular shape such that, combined with a coloring or certain visual designs, it can blend into the environment.