| A | B |
|---|
| nichrome wire | high resistance wire made from nickel and chromium. It is the wire used to make igniter wires |
| nose cone | the front part of the rocket designed to cut down drag as teh rocket is propelled through the air |
| nozzle | the part of a model rocket engine that accelerates the exhaust gas to a high velocity as it is expelled from the engine |
| parachute | an umbrella-shaped sheet made of plastic or light-weight material used to retard the descent of the model rocket as it moves earthward after reaching its maximum altitude |
| prelaunch test | activities used to see if the rocket is stable enough to fly safely |
| propellant | the explosive charges used in model rocket engines |
| rocket | any device, usually cylindrical, containing a solid propellant which, when ignited, produces gases that escape through a nozzle at the rear driving the container (rocket_ forward by the principle action-reaction. |
| shock cord | an elastic rubber band usually attached to the nose cone and glued to the inside of the model rocket body tube by a shock cord mount. It is designed to absorb the shock when the ejection charge blows the nose cone off the body tube. |
| shroud lines | the strings that connect the rocket to the parachute or streamer |
| stability | all rotating forces of a model rocket are counteracted or overcome |
| streamer | used as a recovery system when the launch area is relatively small or the wind velocity might carry the rocket too far away from the launch site |
| tangent | in trigonometry, the ratio between the side opposite a given acute angle to the adjacent side in a right triangle |
| thrust | the forward force produced in reaction to the gases escaping through the nozzle of a model rocket engine |
| thrust charge | the initial stage of a model rocket engine designed to provide lift-off and acceleration |
| thrust ring | located directly in front of the engine of model rodkets that do not have an engine mount tube and engine holder. It prevents the engine from pushing through the body tube during lift-off and acceleration |
| track | to observe the moving path of a rocket |
| tracking station | a station used to track the path of a rocket or other missile and record certain types of data related to that spacecraft |
| trajectory | the curved path a model rocket takes from the time it leaves the launch pad to the time the recovery mechanism is ejected |
| velocity | speed |
| wadding | used to protect the recovery system from the heat of the ejection charge. Packed between the engine and teh recovery system for a distance equal to one and a half times the diameter of the body tube. Serves as an insulator between the engine and the recovery system and as a gas seal to insure that the ejection charge works evenly against the recovery system and nose cone. |
