diameter ratio

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• diameter ratio — The ratio between the distance an aircraft moves from one revolution of the propeller(s), under specified conditions, and the propeller diameter. Also known as an advance ratio …   Aviation dictionary

• ratio — An expression of the relation of one quantity to another ( e.g., of a proportion or rate). SEE ALSO: index (2), quotient. [L. r. (ration ) a reckoning, reason, fr. reor, pp. ratus, to reckon, compute] absolute terminal innervation r. the number… …   Medical dictionary

• Angular diameter — The angular diameter or apparent size of an object as seen from a given position is the “visual diameter” of the object measured as an angle. In the vision sciences it is called the visual angle. The visual diameter is the diameter of the… …   Wikipedia

• advance ratio — The ratio between the distance an aircraft moves from one revolution of a propeller(s), under specified conditions, and the propeller’s diameter. It is the ratio of the forward speed divided by the product of rotational speed and the diameter.… …   Aviation dictionary

• Advance ratio — Diameter of the propeller. In aeronautics and marine hydrodynamics, the advance ratio at which a propeller is operating is the ratio between the distance the propeller moves forward through the fluid during one revolution, and the diameter of the …   Wikipedia

• Poisson's ratio — ( ν ), named after Simeon Poisson, is the ratio of the relative contraction strain, or transverse strain (normal to the applied load), divided by the relative extension strain, or axial strain (in the direction of the applied load).When a sample… …   Wikipedia

• Stroke ratio — In a reciprocating piston engine, the stroke ratio, defined by either bore/stroke ratio or stroke/bore ratio, is a term which is used to describe the ratio between the diameter of the cylinder bore and the length of the piston stroke within its… …   Wikipedia

• Gear ratio — The gear ratio is the relationship between the number of teeth on two gears that are meshed or two sprockets connected with a common roller chain, or the circumferences of two pulleys connected with a drive belt. General description In the… …   Wikipedia

• Compression ratio — For compression ratio in data compression, see data compression ratio. The compression ratio of an internal combustion engine or external combustion engine is a value that represents the ratio of the volume of its combustion chamber from its… …   Wikipedia

• Sauter diameter — The Sauter mean diameter (SMD) is defined as the diameter of a sphere that has the same volume/surface area ratio as a particle of interest. Originally developed by German scientist, J. Sauter in the late 1920s. The SMD is common measure in fluid …   Wikipedia

• aspect ratio — 1. Aeron. the ratio of the span of an airfoil to its mean chord. 2. Television. the ratio of the width of an image to its height, usually the ratio 4 to 3. 3. Naval Archit. the ratio of the height of a rudder to its fore and aft length. 4.… …   Universalium