United States military aircraft designation systems

The United States Military Aircraft Designation System was first designed in 1919 when the US Army's Aeronautical Division became the United States Army Air Service. Before this aircraft were put into service under their manufacturers' designations.

History

United States Army Air Service 1919 to 1924

During this period Type Designations used by the United States Army Air Service were allotted, using two or three letters, which were an abbreviation of the aircraft's purpose. Examples include GA for Ground Attack aircraft; NO for Night Observation aircraft and NBS for Night Bombardment, Short Distance aircraft.

Army aviation 1924 to 1962

From 1924 to 1947 the Air Service, United States Army Air Corps, United States Army Air Forces and United States Air Force used a designation system based on mission category, with each model in a category numbered sequentially. In 1947, the designation system was extensively overhauled, with several categories being dispensed with, and others renamed For instance, the Lockheed P-80 Shooting Star (Pursuit) was redesignated as F-80 (Fighter), while the A-26 medium bomber/attack aircraft was redesignated as the B-26, reusing the designation, the Martin B-26 having retired in the meantime.

F14

F14, F.XIV, F.14 or F-14 may refer to :

WM

WM Wm, wm, or variants may refer to:

Companies

Science and medicine

Technology and computing

Sport

Military

Irradiance

In radiometry (measurement of electromagnetic radiation), irradiance is the radiant flux (power) received by a surface per unit area, and spectral irradiance is the irradiance of a surface per unit frequency or wavelength, depending on whether the spectrum is taken as a function of frequency or of wavelength. The SI unit of irradiance is the watt per square metre (W/m²), while that of spectral irradiance is the watt per square metre per hertz (W·m⁻²·Hz⁻¹) or the watt per square metre per metre (W·m⁻³)—commonly the watt per square metre per nanometre (W·m⁻²·nm⁻¹). The CGS unit erg per square centimetre per second (erg·cm⁻²·s⁻¹) is often used in astronomy. Irradiance is often called "intensity" in branches of physics other than radiometry, but in radiometry this usage leads to confusion with radiant intensity.

Mathematical definitions

Irradiance

Irradiance of a surface, denoted E_e ("e" for "energetic", to avoid confusion with photometric quantities), is defined as

where

College of William & Mary

The College of William & Mary in Virginia (also known as William & Mary, or W&M) is a public research university located in Williamsburg, Virginia, United States. Privately founded in 1693 by letters patent issued by King William III and Queen Mary II, it is the second-oldest institution of higher education in the United States after Harvard University and the oldest in the American South. William & Mary is one of the original eight "Public Ivies," a term coined by Richard Moll in 1985 for publicly funded universities providing a quality of education considered comparable to that available in the Ivy League.

William & Mary educated U.S. Presidents Thomas Jefferson, James Monroe, and John Tyler as well as other key figures important to the development of the nation, including U.S. Supreme Court Chief Justice John Marshall, Speaker of the House Henry Clay, sixteen members of the Continental Congress, and four signers of the Declaration of Independence. W&M founded the Phi Beta Kappa academic honor society in 1776 and was the first school of higher education in the United States to install an honor code of conduct for students. The establishment of graduate programs in law and medicine in 1779 makes it one of the first universities in the United States.