Model Rocketry and Siege Engine Glossary Letter R


Model Rocketry and Siege Engine Glossary Letter R

Glossary
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Ramjet
A compressorless jet-propulsion device which depends for its operation on the air compression accomplished by the forward motion of the unit
Rangehead
The part of a launch site where the pads are located
Reaction Engine
An engine or motor that derives thrust by expelling a stream of moving particles to the rear
Reconnaissance Satellite
An earth satellite designed to obtain strategic information, as through photography, television, etc
Rear Ejection
The ejection of recovery device through the rear of a model
Red Baron
The condition in which a boost glider's motor pod and recovery system gets tangled with the glider portion, causing the glider to spiral down as if it had been "shot down"
Reefed Parachute
A parachute whose shroud lines are restricted to prevent full opening of the canopy
Re-entry
The event occurring when a ballistic missile or other object comes back into the sensible atmosphere after being rocketed to altitudes above the sensible atmosphere; the action involved in this event. Attributed as in re-entry problem
Reynolds Number
A nondimensional co-efficient that measures the compression of air due to scaling. This allows scale models to be tested in wind tunnels
Relayer
A launch controller that controls electrical current to the igniter through an electrical relay. This arrangement allows the power source to be placed close to the rangehead, reducing the voltage drop through long wires
Retainer
A device for keeping the rocket motor from being ejected by the force of the deployment charge
RG
See Rocket Glider
Rigid Wing
A glider with wings using rigid airfoils rather than a parafoil or flexible wing
Riser
A length of shock cord or other line which is placed between parachute shrouds and a central attachment point on recovery systems with multiple parachutes. This provides more free play for the parachutes, and prevents the canopies from interfering with one another
RMS
Reusable Motor System. A solid rocket motor which can be re-fueled and reused
Rocket
A thrust-producing system or a complete missile which derives its thrust from ejection of hot gases generated from material carried in the system, not requiring intake of air or water
Rockets: Booster Rockets, Auxiliary Rockets
Rocket engines that are mounted on airplanes or on missiles to give initial boost during takeoff. Booster rockets usually are jettisoned or dropped after the plane or the missile becomes airborne
Rockets: Operational Rockets or Missiles
Usually refers to missiles that are in service and/or production by the Army, Navy, or Air Force
Rockets: Research or Sounding Rockets
Rocket-powered missiles that carry instruments to high altitudes for measuring atmospheric data , such as cosmic radiation, ultra-violet intensity, temperatures, etc
Rocket Sled
A vehicle traveling along a set of rails, and powered by rocket motors. Rocket sleds are used to study high stress or high accelerations on humans and also on components, such as electronic gear, designed for missile guidance systems, etc
Rockets: Stage Rockets, Step Rockets
Rocket vehicles consisting of two or more stages , i.e., one smaller rocket mounted on top of another bigger one. Individual stages are dropped after propellants have been burned. Technique is used to obtain maximum speed in a short time.
Roll
An angular displacement about an axis parallel to the longitudinal axis of an airframe
Rocket Glider
A type of boost glider that has the characteristics of a model rocket when ascending, then changes its configuration to have the characteristics of a glider when descending. All parts remain with the model other than the spent fuel
Rogallo Wing
A flexible delta wing platform developed by Francis Rogallo that is popular for kites, hang-gliders and ultralights
Roll
Rotational motion of a rocket through the long (flight) axis
Root Chord
The chord at the root of a wing or fin. See Chord
Root Edge
The edge of a fin or wing that is glued to the airframe
Rotor
A multi-bladed propeller used to produce lift or control the orientation of an aircraft
Rotor Blades
Wing-like extensions, rotating around a central hub of a helicopter or autogyro
Rotor Disc
The disc of space formed by the rotation of rotor blades
Rotor Hub
The central attachment point for the blades of a rotor. The attachment usually determines the pitch angle of the blades. The hub can be of 2 types: fixed or rotating
RRS
Reaction Research Society - The oldest continuously-running amateur rocketry group in the United States
RSO
Range Safety Officer. Person(s) responsible for field safety. Determines suitability of rockets to fly at a particular site. Inspects rockets prior to flight.
At NAR and CAR organized launches, the RSO may be the person with overall authority over launch administration. The rocket inspection duties are handled by a Safety Check Officer (SCO) who reports to the RSO. In case of a dispute over a rocket’s suitability, the RSO has the final word.
RTF
Ready to Fly. A rocket which is sold pre-built, as opposed to a kit, and requires almost no assembly


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