Model Rocketry and Siege Engine Glossary Letter I


Model Rocketry and Siege Engine Glossary Letter I

Glossary
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I.D.
Inside Diameter
IAR
Independent Association of Rocketry
Igniter
A length of high-resistance wire, sometimes coated with a flammable material, which is placed in contact with the motor propellant prior to the rocket’s launch. When an electrical current is passed through the igniter by the launch controller, the wire’s high resistance causes it to become very hot and ignite the surrounding propellant
Igniter Plug
Plug of paper or plastic forced into the motor nozzle after insertion of the igniter, designed to keep the igniter pressed against the propellant
Impulse
Thrust force multiplied by time. The units of measurement are usually Newtons and Seconds
Inclinometer
A device for determining a rocket’s apogee without the use of electronics. A distance is measured off from the launch pad prior to launch. At the time of launch, an observer stands at the measured point and keeps the inclinometer aimed at the rocket. The inclinometer mechanically records the angle at which it is held. Since two angles and the distance between the rocket’s point of origin and the inclinometer are known (assuming that the rocket is launched vertically), a triangle can be graphed which will indicate the apogee attained by the rocket. See Theodolite
Indirect Staging
Air start of the motor on a sustainer stage by some means other than using the forward-shot bit of propellant from the booster motor
Induced Drag
Drag resulting from lift generated by the foils and lifting body of a aircraft or rocket
Intercontinental Ballistic Missile (ICBM)
A ballistic missile which has a range of approximately 5000 nautical miles
Intercontinental Range Ballistic Missile (IRDM)
A ballistic missile which has a range of approximately 1500 nautical miles
Interstage
A section of a rocket in between two stages, such as the interstage spacing ring between the first and second stage of the Saturn V
Ion Engine
A projected species of reaction engine whose thrust is to be obtained from a stream of ionized atomic particles supplied by atomic fission; atomic fusion, or solar energy.
Ionosphere
That portion of the earth's atmosphere beginning about 30 miles above the earth's surface, which consists of layers of highly ionized air capable of bending or reflecting certain radio waves back to the earth
Isp
Symbol for Specific Impulse


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