Abstract: Apparatus for simulating the playing of golf includes a tee area from which a player may drive a golf ball toward a curved target screen in front of the tee area. Optical sensing devices are positioned to gather data as to the speed and distance of travel of a ball driven from the tee area. With the data from the sensing devices, computer apparatus produces an estimate for display of the distance of travel and ultimate resting position the driven ball would have if allowed free flight. Sensing devices also allow the computer apparatus to determine when a ball falls into a cup located in front of the target screen. If a ball enters the cup, and if the computer apparatus determines that the ball would have landed within a prescribed distance from the location of a target hole towards which the ball is driven, a "holed out" condition is presumed.

Abstract: A method for preparing a binder for use in a double base propellant comprng forming a suspension of stabilizer components in the binder material by low shear mixing, combining the suspension with a plasticizer by dry sparge air mixing and removing of water by a combination of continued dry sparge air mixing and elevated temperature.