**Critical Mach number** — Transonic flow patterns on an aircraft wing showing the effects at critical mach. In aerodynamics, the critical Mach number (Mcr) of an aircraft is the lowest Mach number at which the airflow over any part of the aircraft reaches the speed of… … Wikipedia

**critical drag rise Mach number** — The free stream Mach number at which because of shock wave, the coefficient of drag for a given angle of attack increases rapidly. This increase in drag value should be at least 0.005. Also called a compressibility drag rise Mach number … Aviation dictionary

**Drag divergence Mach number** — The drag divergence Mach number (not to be confused with critical Mach number) is the Mach number at which the aerodynamic drag on an airfoil or airframe begins to increase rapidly as the Mach number continues to increase[1]. This increase can… … Wikipedia

**compressibility drag rise Mach number** — That Mach number (beyond critical Mach number) in which the coefficient of drag increases by 0.005. It is the limit of the normal economic operation of the aircraft. Drag coefficient behavior at high showing critical mach number and… … Aviation dictionary

**Mach tuck** — is an aerodynamic effect, whereby the nose of an aircraft tends to pitch downwards as the airflow around the wing reaches supersonic speeds. Note that the aircraft is subsonic, and traveling significantly below Mach 1.0, when it experiences this… … Wikipedia

**Mach** — [[t]mɑ͟ːk[/t]] N UNCOUNT: N n/num Mach is used as a unit of measurement in stating the speed of a moving object in relation to the speed of sound. For example, if an aircraft is travelling at Mach 1, it is travelling at exactly the speed of sound … English dictionary

**Mach (kernel)** — Mach is an operating system microkernel developed at Carnegie Mellon University to support operating system research, primarily distributed and parallel computation. It is one of the earliest examples of a microkernel, and still the standard by… … Wikipedia

**Froude number** — The Froude number is a dimensionless number comparing inertial and gravitational forces. It may be used to quantify the resistance of an object moving through water, and compare objects of different sizes. Named after William Froude, the Froude… … Wikipedia

**Reynolds number** — In fluid mechanics and heat transfer, the Reynolds number mathrm{Re} is a dimensionless number that gives a measure of the ratio of inertial forces ({old mathrm V} ho) to viscous forces (mu / L) and, consequently, it quantifies the relative… … Wikipedia

**Dean number** — The Dean number is a dimensionless group in fluid mechanics, which occurs in the study of flow in curved pipes and channels. It is named after the British scientist W. R. Dean, who studied such flows in the 1920s (Dean, 1927, 1928). Definition… … Wikipedia