Model Rocketry and Siege Engine Glossary Letter G


Model Rocketry and Siege Engine Glossary Letter G

Glossary
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G10
A grade of fiberglass commonly used for fins on high power rockets. G10 designates a laminate made of fiberglass cloth laid in epoxy resin
G Code
Used in CAD and CAM. G Code is the industry standard interpreted programming language that instructs a machine what function to do next
G-Switch
A mechanical device which detects the presence of acceleration through the movement of a weighted electrical contact. G-switches are normally used in combination with other electronic devices such as timers. For example, an electronic timer can be programmed to count down a certain number of seconds after the G-switch closes an electrical circuit, at the end of which time the timer closes a second circuit which activates a deployment charge or sustainer motor igniter
Gantry
Short for gantry crane or gantry scaffold
Gantry Crane
A large crane mounted on a platform that runs back and forth on parallel tracks
Gantry Scaffold
A massive scaffolding structure mounted on a bridge or platform supported by a pair of towers or trestles that run back and forth on parallel tracks, used to service a large rocket as the rocket rests on its launching pad
  • In radar or control terminology, an arrangement to receive signals only in a small, selected fraction of the principal time interval
  • Range of air-fuel ratios in which combustion can be initiated
  • In computer terminology a device used to control passage of information through a circuit
Gimbaled Motor
A rocket motor mounted on a gimbal, i.e., on a contrivance having two mutually perpendicular and intersecting axes of rotation, so as to obtain pitching and yawing correction moments
Glide
The controlled descent of an air vehicle using control surfaces, not rockets to maintain control. The descent is a result of gravity and lifting forces generated by the shape of the air vehicle
Glide path
The descent of a gliding air vehicle as viewed from the side
Glide Ratio
The ratio between distance traveled horizontally and the amount of vertical drop
Gliding Booster
A booster stage whose fins are placed asymmetrically and is balanced to achieve a glide after ejecting from the rocket
Glow
Gross Lift Off Weight - The mass of a rocket completely prepped for flight
Gore
The rounded triangular section of fabric between two longitudinal seams or shrouds in a parachute canopy
GOX
Gaseous Oxygen
  • The body of a solid propellant used in a rocket, fashioned to a particular size and shape so as to burn smoothly without severe surges or detonations
  • Also, the direction of the fibers in a piece of wood, such as balsa. See Wood Grain
Gravitational Constant (g)
The acceleration due to gravity (32.2 feet per second per second)
GSE
Ground Support Equipment
Guidance
The entire process of determining the path of a missile and maintaining the missile on that path
Guidance, Beam Rider
A guidance system in which equipment aboard the missile causes it to seek out and follow a path specified by a beam
Guidance, Celestial Navigation
Navigation by means of observations of celestial bodies . A system wherein a missile, suitably instrumented and containing all necessary guidance equipment, may follow a predetermined course in space with reference primarily to the relative positions of the missile and certain preselected celestial bodies
Guidance, Command
A guidance system wherein intelligence transmitted to the missile from an outside source causes the missile to traverse a directed path in space
Guidance, Fin Stabilization
The simplest method of guiding a rocket or missile in flight where aerodynamic surface fins are mounted on the body of the rocket or missile (usually at the aft end) for stabilizing its flight path and to prevent it from tumbling
Guidance, Homing
A system in which a missile steers toward a target by means of radiation which the missile receives from the target, either by reflection (radar or visible light) or by emission from the target (infra-red or acoustic energy)
Guidance, Homing, Passive
A system of homing guidance wherein the receiver in the missile utilizes natural radiations from the target
Guidance, Homing, Semiactive
A system of homing guidance wherein the receiver in the missile utilizes natural radiations from the target
Guidance, Inertial
A form of guidance in which all guidance components are located aboard the missile. These components include devices to measure forces acting on the missile and generating from this measurement the necessary commands to maintain the missile on a desired path
Guidance, Infra-Red
A guidance method operating on the "detection of heat (radiation) waves from a target. Sensitive instruments in the nose of the rocket or missile pick up the beat waves (such as engine exhausts) and through a connected control system guide it to the target
Guidance, Midcourse
The guidance applied to a missile between the termination of the launching phase and the start of the terminal phase of guidance
Guidance, Preset
A technique of missile control wherein a predetermined path is set into the control mechanism of the vehicle and cannot be adjusted after launching
Guidance, Radar Beam
Radio signals from a radar transmitter on the ground or in an aircraft or missile traveling similar to beams of light. The radar beam is reflected from any object (clouds, land, sea , etc.) the same as light is reflected from a mirror. The missile follows the reflected beam to reach its destination
Guidance, Radar Control
Radio transmitters located in the missile send out signals to the target that are reflected back to the missile. Timing of the signals to the target and back to the missile makes it possible to determine the distance, altitude, and direction of motion of the target. Control systems in the missile, operating with radar; use this information in guiding the missile to the target
Guidance, Radio Navigation
A form of guidance in which the path of the missile is determined by a time measure of radio signals
Guidance, Terminal
The guidance applied to a missile between the termination of the midcourse guidance and impact with or detonation in close proximity of the target.
Guidance, Terrestrial Reference
A technique of missile control wherein the predetermined path set into the control system of a missile can be followed by a device in the missile which reacts to some property of the earth, such as magnetic or gravitational effects
Guided Missile
An unmanned vehicle moving above the earth's surface, whose trajectory or flight path is capable of being altered by a mechanism with in the vehicle
Gusset
A roughly triangular shaped piece of material added to reinforce a joint, often in a corner
Gyroscope
A well balanced wheel or disc, rotating at high speed and generating a high moment of rotation. They are also free to rotate about one or both of two axes perpendicular to each other and to the axis of spin. Gyroscopes work to maintain their original orientation, and so are used to provide stability to rockets
Hand-Launch-Glider
A small robust glider designed to be launched by hand
Hatch
A door in the side of a spacecraft or aircraft


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