Most rockets also employ some sort of recovery device to bring the rocket safely to the ground once the engine run is complete. The type of recovery device depends on the size and weight of the rocket. The most common type of recovery device is the parachute. A properly sized parachute will bring the rocket down slowly and gently. Problem with parachutes is that they tend to drift in the wind meaning the model can often end up in a tree.

An alternative to the parachute is a streamer. A streamer is just a long piece of material (usually crepe paper or plastic) which is used to create drag in the air so slowing the rocket decent. Steamers don't often drift and are usually more accurate. Then there are some uncommon types of recovery devices. Some rockets use helicopter veins to slow the descent down, other rockets use gliders or are gliders themselves.

Rocket engines are solid fuel propellant motors. Power is distinguished by the numbers of the rocket motor. For example an A8-3

A - represents the total impulse of that engine.

8 - indicates the average thrust measured in Newtons.

3 - indicates the time delay of the ejection charge. The ejection charge is what will push the recovery device out of the rocket.