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The Scimitar was used by the three formation reconnaissance regiments of the British Army. After the Strategic Defence and Security Review in 2010, some regiments' Challenger 2 tanks were replaced with CVR(T) Scimitars. [22] The Scimitar was retired from active service in April 2023. [2] Belgium – 153 units, [23] withdrawn from active service ...
Counter-rotating propellers World War I Linke-Hofmann R.I German heavy bomber (1917) with counter-rotating propellers He 177A Greif with counter-rotating propellers. Counter-rotating propellers (CRP) are propellers which turn in opposite directions to each other. [1]
Contra-rotating propellers Contra-rotating propellers on the Rolls-Royce Griffon-powered P-51XR Mustang Precious Metal at the 2014 Reno Air Races. Aircraft equipped with contra-rotating propellers (CRP) [1] coaxial contra-rotating propellers, or high-speed propellers, apply the maximum power of usually a single piston engine or turboprop engine to drive a pair of coaxial propellers in contra ...
Modern usage of scimitar propellers centers around turboprop and propfan engines. Since these forms of propulsion are capable of driving a propeller at transsonic or supersonic rotational speeds, as well as propelling aircraft to similarly high speeds, mitigation of wave drag is an important consideration in achieving high aerodynamic efficiency.
Thin blade sections are used and the blades are swept back in a scimitar shape (scimitar propeller) in a manner similar to wing sweepback, so as to delay the onset of shockwaves as the blade tips approach the speed of sound. The maximum relative velocity is kept as low as possible by careful control of pitch to allow the blades to have large ...
The Spirit of Dallas catamaran on White Rock Lake A Formula 16 beachable catamaran Powered catamaran passenger ferry at Salem, Massachusetts, United States. A catamaran (/ ˌ k æ t ə m ə ˈ r æ n /) (informally, a "cat") is a watercraft with two parallel hulls of equal size. The wide distance between a catamaran's hulls imparts stability ...
HMS Sabre was a Scimitar-class fast patrol boat of the British Royal Navy.She was commissioned into the Gibraltar Squadron on 31 January 2003 along with her sister Scimitar, and used for police, customs and rescue purposes. [1]
The Reaction Engines Scimitar is a derivative of the SABRE engine technology, but intended for jet airliners (the Reaction Engines LAPCAT A2 concept), rather than space launch applications. Consequently, most of the Scimitar engine technology is similar to SABRE but designed for much longer life. [ 1 ]