Editing Solid-propellant rocket (section)

==Hobby and amateur rocketry==
Solid propellant rocket motors can be bought for use in [[model rocket]]ry; they are normally small cylinders of black powder fuel with an integral [[nozzle]] and optionally a small charge that is set off when the propellant is exhausted after a time delay. This charge can be used to trigger a [[camera]], or deploy a [[parachute]]. Without this charge and delay, the motor may ignite a second [[multistage rocket|stage]] (black powder only).

In mid- and [[high-power rocketry]], commercially made APCP motors are widely used. They can be designed as either single-use or reloadables. These motors are available in impulse ranges from "A" (1.26&nbsp;Ns– 2.50&nbsp;Ns) to "O" (20.48&nbsp;kNs – 40.96&nbsp;kNs), from several manufacturers. They are manufactured in standardized diameters and varying lengths depending on required impulse. Standard motor diameters are 13, 18, 24, 29, 38, 54, 75, 98, and 150 millimeters. Different propellant formulations are available to produce different thrust profiles, as well as special effects such as colored flames, smoke trails, or large quantities of sparks (produced by adding [[titanium]] sponge to the mix).