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The International Civil Aviation Organization (ICAO) classifies aircraft by their indicated airspeed at runway threshold (V at, [1]: II-5-1-3 also known as approach speed or V REF). The categories are as follows: [1]: II-5-1-3 Category A: less than 169 km/h (91 kt) indicated airspeed (IAS)
The Republic XP-72 was an American prototype fighter-interceptor developed by Republic Aircraft as a progression of the P-47 Thunderbolt design. The XP-72 was designed around the Pratt & Whitney R-4360 Wasp Major 28-cylinder air-cooled radial engine with a supercharger mounted behind the pilot and driven by an extension shaft from the engine.
In December 2014, NASA awarded Lockheed Martin a contract to study the feasibility of building the SR-72's propulsion system using existing turbine engine technologies, The $892,292 (~$1.13 million in 2023) contract funded a design study to determine the viability of a TBCC propulsion system by combining one of several current turbine engines, with a very low Mach ignition Dual Mode Ramjet (DMRJ).
TsKB-6 six-seat passenger/utility aircraft project. TsKB-26 proof of concept prototype for DB-3. M Sh attack aircraft project, 1942. Il-14 four-engine high-speed bomber project, 1944. Il-16 four-engine jet airliner project, 1954. Resembled the Tupolev Tu-110; cancelled due to the Tu-104. Il-24 twin-engine jet bomber project derived from the Il ...
The S-72 in flight without a main rotor in 1984. Sikorsky and Bell Helicopters competed for the RSRA contract. [1] Bell's preferred proposal was the "Bell 646A" with rotors based on the Bell 240 UTTAS; the alternative was the smaller "Bell 646B" based on the Bell 309 KingCobra. [2]
You can follow him on X @GabeHauari or email him at Gdhauari@gannett.com. This article originally appeared on USA TODAY: Are banks, post offices, UPS and FedEx open on Christmas Day 2024?
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