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The ERDL pattern, also known as the Leaf pattern, [2] is a camouflage pattern developed by the United States Army at its Engineer Research & Development Laboratories (ERDL) in 1948. [ 3 ] [ 4 ] It was not used until the Vietnam War , when it was issued to elite reconnaissance and special operations units beginning early 1967.
One of the earliest engines that resembled the propfan concept was the 4,710 pounds-force (21.0 kilonewtons) Metrovick F.5, which featured twin contra-rotating fans—14 blades in the fore (front) fan and 12 blades in the aft (back) fan—at the rear of the engine and was first run in 1946.
The shaped edges smooth the mixing of hot air from the engine core and cooler air flowing through the engine fan, which reduces noise-creating turbulence. [37] Chevrons were developed by GE under a NASA contract. [31] Some notable examples of such designs are Boeing 787 and Boeing 747-8 – on the Rolls-Royce Trent 1000 and General Electric ...
With the Air Force receiving its first KC-46 Pegasus (after a litany of delays and headaches) in 2019, the plan is to eventually have a 479-plane refueling fleet filled with 300 KC-135s and 179 KC ...
A centrifugal fan produces more pressure for a given air volume, and is used where this is desirable such as in leaf blowers, blowdryers, air mattress inflators, inflatable structures, climate control in air handling units and various industrial purposes. They are typically noisier than comparable axial fans (although some types of centrifugal ...
United States Air Force General Nathan Farragut Twining wearing the service dress hat with silver cloud and lightning bolt embellishments for a 4-star USAF general officer. In the United States armed forces and United States Uniformed Services, "scrambled eggs" is the nickname for the golden oak leaf and acorn embellishments (known as fretting) on the bills (visors) of framed service and dress ...
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The first Eighth Air Force aircraft to receive unit markings were the Spitfires of the 4th and 31st Fighter Groups training with RAF Fighter Command in September 1942. The markings were two-letter fuselage squadron codes located on one side of the national insignia and a single letter aircraft code on the other side.