| 词条 | Focke-Achgelis Fa 269 | ||||||||||||||
| 释义 |
The Focke-Achgelis Fa 269 was a tiltrotor VTOL aircraft project designed by Henrich Focke. DevelopmentConceived as a single-seat fighter, the Fa 269 project resulted from a design study order issued by the Reich Air Ministry to Focke-Achgelis in 1941. The order called for a local defence fighter which would combine the VTOL capabilities of a helicopter with the speed and economy of a conventional fixed-wing aircraft. A large amount of wind tunnel testing was undertaken, along with work on gearboxes, drives and power-pivoting mechanisms, and a full-scale mock-up of the aircraft was built to demonstrate the VTOL concept, but much of this was destroyed by Allied bombing raids and all work was shelved in 1944,[1] when Focke-Achgelis estimated that there was little likelihood of a practical prototype being available before 1947. DesignA mid-wing monoplane, the Fa 269 was to have been powered by a single BMW 801 air-cooled radial engine buried in the fuselage behind the cockpit, which was to have driven transverse drive shafts in the leading edges of the fixed wing, the shafts turning three-bladed rotors via synchronised gearboxes. The plane of rotation of the rotors would have been capable of being swivelled through 80° using angled extension shafts. It was proposed that the Fa 269 would adopt a high angle of attack when at rest using extremely long undercarriage units. For vertical take-off, the rotors would be lowered till their plane of rotation was parallel with the ground. For translation to conventional flight following take-off, the extension shafts were to pivot to the rear, the rotors then behaving as pusher propellers.[2] Specifications (Fa 269){{aerospecs|ref=Air International, January 1975 |met or eng?=met |crew=1 |capacity= |length m=8.93 |length ft=29 |length in=3 |span m=10 |span ft=32 |span in=9 |swept m= |swept ft= |swept in= |rot number= |rot dia m= |rot dia ft= |rot dia in= |dia m= |dia ft= |dia in= |width m= |width ft= |width in= |height m= |height ft= |height in= |wing area sqm= |wing area sqft= |swept area sqm= |swept area sqft= |rot area sqm= |rot area sqft= |volume m3= |volume ft3= |aspect ratio= |empty weight kg= |empty weight lb= |gross weight kg= |gross weight lb= |lift kg= |lift lb= |eng1 number=1 |eng1 type=BMW 801 14-cylinder radial piston |eng1 kw= |eng1 hp= |eng1 kn= |eng1 lbf= |eng1 kn-ab= |eng1 lbf-ab= |eng2 number= |eng2 type= |eng2 kw= |eng2 hp= |eng2 kn= |eng2 lbf= |eng2 kn-ab= |eng2 lbf-ab= |max speed kmh=570 |max speed mph=354 |max speed mach= |cruise speed kmh= |cruise speed mph= |range km= |range miles= |endurance h= |endurance min= |ceiling m= |ceiling ft= |glide ratio= |climb rate ms= |climb rate ftmin= |sink rate ms= |sink rate ftmin= |armament1=2 x 30mm MK 108 cannon |armament2= |armament3= |armament4= |armament5= |armament6= }} References{{Commons category|Focke-Achgelis Fa 269}}1. ^{{cite book|last=Lepage|first=Jean-Denis G.G.|title=Aircraft of the Luftwaffe, 1935–1945: An Illustrated Guide|url=https://books.google.com/books?id=hdQBTcscxyQC&pg=PA385&dq=Focke-Achgelis+Fa+269&hl=en&sa=X&ved=0ahUKEwjkt_KorcXXAhXELyYKHZt_BUoQ6AEIJjAA#v=onepage&q=Focke-Achgelis%20Fa%20269&f=false|year=2009|publisher=McFarland & Company|location=Jefferson, NC|isbn=978-0-7864-3937-9|page=385}} 2. ^{{cite book|last1=Ford|first1=Roger|title=Germany's Secret Weapons of World War II|date=2013|publisher=Amber Books|location=London, United Kingdom|isbn=9781909160569|pages=224}}
6 : Abandoned military aircraft projects of Germany|Focke-Achgelis aircraft|German experimental aircraft 1940–1949|Research and development in Nazi Germany|Tiltrotor aircraft|Mid-engined aircraft |
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