Model Rocketry and Siege Engine Glossary Letter O


Model Rocketry and Siege Engine Glossary Letter O

Glossary
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O.D.
Outside Diameter
Oddroc
Slang term for a strange-looking rocket. Oddrocs are often made in the shape of other, non-rocketry-related items
Ogive
In rocketry, the shape of a common type of nose or tail cone. If the sides of the cone are curved rather than straight, the geometric shape of the cone is actually an ogive rather than a cone
ON
Ontario
One-Caliber Stability
A widely-accepted rule of thumb for rocket stability: The center of gravity should be approximately one body width (one "caliber") ahead of the center of pressure
OOP - Out Of Production
This is a reference to a rocket that was once but is no longer produced by a commercial manufacturer. Reproduction of plans, parts lists, and scaling information for once-popular out-of-production model rockets has become an Internet cottage industry
Open Breech
A piston launcher in which the motor travels up the piston tube and engages the motor mount. See Piston Launcher
Optimum Weight
The mass required to lift a rocket to the highest possible altitude on a given motor
Orange Book
BATF explosives rule book
Orbit
The path described by a body in its revolution about another body
Orbital Velocity
The average velocity at which an earth satellite or other orbiting body orbits
Oscillation, Parachute
The swinging from side to side of a payload under a parachute
Outboard
Direction parallel to the lateral axis of the rocket and perpendicular to the centerline
Over-Expansion
See Krushnic Effect
  • Any substance which reacts with another substance to support burning.
  • A substance which provides oxygen to a combustion process, aiding in the speed and efficiency of combustion. The addition of an oxidizer to the chemical process of combustion can cause a fuel that would barely burn under normal atmospheric conditions to burn so enthusiastically that it can be used as a rocket propellant
Ozonoshpere
A stratum in the upper stratosphere at an altitude of approximately 40 miles having a relatively high concentration' of ozone and important for its absorption of ultra violet radiation from the sun


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