Abstract: A portable apparatus propels a projectile such as a golf ball, without the use of any external source of power. A striking driver is retracted, to a non-equilibrium position, by application of force, and is held in the non-equilibrium position. When the striking driver is released, it travels along a guided path and forcibly contacts the projectile, which is held in a loading port. Differential friction devices may be used on the projectile and/or the striking driver, to impart spin to the projectile. A rotary trigger alternately blocks and unblocks the striking driver, enabling control of the release of the striking driver. The apparatus may include various safety devices which prevent accidental release of the striking driver.

Abstract: A portable apparatus propels a projectile such as a golf ball, without the use of any external source of power. A striking driver is retracted, to a non-equilibrium position, by application of force, and is held in the non-equilibrium position. When the striking driver is released, it travels along a guided path and forcibly contacts the projectile, which is held in a loading port. Differential friction devices may be used on the projectile and/or the striking driver, to impart spin to the projectile. A rotary trigger alternately blocks and unblocks the striking driver, enabling control of the release of the striking driver. The apparatus may include various safety devices which prevent accidental release of the striking driver.