A table tennis ball which has, on the spherical surface thereof, a marking to make a ball rotation measurable. The marking contains a number of marking points, which are distributed on the ball surface in such a way that the standard deviation of the lengths of the orthodromes between each of the marking points and the three nearest neighboring points thereof is at least 12% of the average value of these lengths, and the minimum length of the orthodromes between each of the marking points and the three nearest neighboring points thereof is at least 40% of the average value of these lengths.

A system for monitoring at least one projectile during flight. The system includes a radar apparatus, a trigger, and a processor. The radar apparatus transmits a radar signal that includes a base radar frequency signal with a frequency shift. The radar signal has a signal profile in a direction of a chosen target and reflects off the projectile(s) traveling through the signal profile toward the target. The radar apparatus receives at least one reflected signal from the projectile(s). The trigger is operably coupled to the radar apparatus to automatically initiate operation of the radar apparatus. The processor collects data from the radar apparatus and calculates velocity of the projectile(s) based thereon. The present disclosure further provides a method of monitoring the projectile(s) during flight with the system. The present disclosure further provides a chronograph system with a housing, aiming device with a peep sight, and a trigger.

The method and apparatus for a remote weapon station or incorporated into manually-aimed weapons. The methodology requires use of a muzzle velocity sensor that refines the aiming of the second and subsequent fires or volleys fired from weapon systems. When firing the first volley a weapon uses an estimated velocity and, at firing, the muzzle velocity of a projectile is measured. When firing the second volley a weapon's fire control calculates an aiming point using the measured velocity of the first volley.

Systems and techniques for facilitating archery implemented in conjunction with a bow mountable laser-based speed measurement instrument or a speed sensor bar as well as a bow movement sensor system which may be affixed to any of the available mounting positions on a conventional bow.

A compound bow includes a riser, an upper limb, and a lower limb, the upper limb and lower limbs coupled to the riser. The compound bow may include a draw sensor. The compound bow includes a performance module coupled to the riser, the performance module operatively coupled to the draw sensor. A compound bow may include an arrow chronometer assembly. A method may include determining draw weight or length based on measurements of the draw sensor. A method may include determining arrow speed based on measurements of the arrow chronometer assembly.

The present disclosure relates to a ballistic projectile velocity measurement apparatus that senses and records the times in which a projectile travels through two vertical planes represented by two sensor gates which are spaced horizontally from each other. The sensor gates each utilize an LED laser that emits a laser light through a diffuser along a diffusion angle into a plurality of laser light sensors to create a wall of laser light, and the sensor gates register a break in the wall of light when a ballistic projectile obstructs the light received by at least one laser light sensor. The ballistics apparatus then determines the velocity of the projectile based on the distance between the two gates and difference in time between the two plane-breaking events.

A compound bow includes a riser, an upper limb, and a lower limb, the upper limb and lower limbs coupled to the riser. The compound bow may include a draw sensor. The compound bow includes a performance module coupled to the riser, the performance module operatively coupled to the draw sensor. A compound bow may include an arrow chronometer assembly. A method may include determining draw weight or length based on measurements of the draw sensor. A method may include determining arrow speed based on measurements of the arrow chronometer assembly.

The present disclosure relates to a ballistic projectile velocity measurement apparatus that senses and records the times in which a projectile travels through two vertical planes represented by two sensor gates which are spaced horizontally from each other. The sensor gates each utilize an LED laser that emits a laser light through a diffuser along a diffusion angle into a plurality of laser light sensors to create a wall of laser light, and the sensor gates register a break in the wall of light when a ballistic projectile obstructs the light received by at least one laser light sensor. The ballistics apparatus then determines the velocity of the projectile based on the distance between the two gates and difference in time between the two plane-breaking events.

A flying object position measuring apparatus includes an optical sensor, a storage, an orientation calculator, and a position calculator. The optical sensor obtains an image of a flying object. The flying object performs flight along a ballistic trajectory. The storage stores, in advance, basic trajectory information regarding a basic trajectory of the flying object. The basic trajectory information includes position information of a start point at which the flying object starts the flight. The orientation calculator calculates an orientation of the flying object as viewed from the optical sensor on the basis of the image obtained by the optical sensor. The position calculator calculates, as a position of the flying object, an intersection of a plane of rotation with the orientation of the flying object. The plane of rotation is a plane based on a rotation of the basic trajectory around a vertical axis that travels through the start point.

A compound bow includes a riser, an upper limb, and a lower limb, the upper limb and lower limbs coupled to the riser. The compound bow may include a draw sensor. The compound bow includes a performance module coupled to the riser, the performance module operatively coupled to the draw sensor. A compound bow may include an arrow chronometer assembly. A method may include determining draw weight or length based on measurements of the draw sensor. A method may include determining arrow speed based on measurements of the arrow chronometer assembly.