| 词条 | Lockheed Altair | |||||||||
| 释义 |
The Lockheed Altair was a single-engined sport aircraft of the 1930s. It was a development of the Lockheed Sirius with a retractable undercarriage, and was the first Lockheed aircraft and one of the first aircraft designs with a fully retractable undercarriage. Development and designLockheed designed an alternative wing fitted with a retractable undercarriage for the Lockheed Sirius as a result of a request from Charles Lindbergh, although Lindbergh in the end chose to buy a standard Sirius. The first Altair, converted from a Sirius, flew in September 1930.[1] Like the Sirius, the Altair was a single-engined, low-winged monoplane of wooden construction. The undercarriage, which was operated by use of a hand crank, retracted inwards. Four Altairs following the prototype were converted Siriuses, with another six Altairs built from scratch: three by Lockheed, two by the Detroit Aircraft Corporation, and one by AiRover. The AiRover Altair, dubbed The Flying Testbed, was powered by a Menasco Unitwin engine, which used two engines to drive a single shaft.[2] The Unitwin was used in the Vega Starliner, which never went into production. Operational historyThe prototype Altair was purchased by the United States Army Air Corps and designated Y1C-25, with a second Altair, fitted with a metal construction fuselage was also purchased by the Army as the Y1C-23 and used as a staff transport, as was a single similar aircraft operated by the US Navy as the XRO-1.[3] Altairs were used to carry out a number of record-breaking long-range flights. One aircraft, named Lady Southern Cross was used by Australian aviator Charles Kingsford Smith to carry out the first flight between Australia and the United States between October 20 and November 4, 1934. Kingsford Smith was killed in the early hours of November 8, 1935, flying Lady Southern Cross during an attempt on the record for flying between England and Australia.[4] Two Altairs were used by the Japanese newspaper Mainichi Shimbun as high-speed passenger and cargo aircraft, one remaining in use until 1944.[5] Variants
Operators
Specifications (Y-1-23){{aircraft specifications||plane or copter?=plane |jet or prop?=prop |ref=Lockheed Aircraft since 1913[6] |crew=1 |capacity= |length main=28 ft 4 in |length alt=8.64 m |span main=42 ft 9 in |span alt=13.03 m |height main=9 ft 6 in |height alt=2.90 m |area main=293.2 ft² |area alt=27.24 m² |airfoil= |empty weight main=3,235 lb |empty weight alt=1,468 kg |loaded weight main=4,895 lb |loaded weight alt=2,220 kg |max takeoff weight main= |max takeoff weight alt= |more general= |engine (prop)=Pratt & Whitney SR-1340E Wasp |type of prop=9-cylinder air cooled radial engine |number of props=1 |power main=500 hp |power alt=373 kW |power original= |power more= |max speed main=207 mph |max speed alt=180 kn, 333 km/h |max speed more=at 7,000 ft (2,140 m) |cruise speed main=175 mph |cruise speed alt=152 kn, 282 km/h |range main=580 mi |range alt=504 nmi, 935 km |range more= |ceiling main=23,800 ft |ceiling alt=7,255 m |climb rate main= |climb rate alt= |loading main=52.5 lb/ft² |loading alt=81.5 kg/m² |thrust/weight= |power/mass main=0.10 hp/lb |power/mass alt=0.17 kW/kg |more performance=*Climb to 7,000 ft (2,140 m): 9.4 min |armament= }} See also{{aircontent||similar= |related=
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}} ReferencesNotes1. ^Francillon 1982, p. 101. 2. ^{{cite web|last1=Pearce|first1=William|title=Menasco 2-544 Unitwin Aircraft Engine|url=https://oldmachinepress.com/2013/12/23/menasco-2-544-unitwin/|website=oldmachinepress.com|accessdate=25 May 2016}} 3. ^Francillon 1978, pp. 101–106. 4. ^Francillon 1982, pp. 103–104. 5. ^Francillon 1982, pp. 105–106. 6. ^Francillon 1982, p. 106. Bibliography
External links{{commons category|Lockheed Model 8 Sirius}}
5 : Lockheed aircraft|United States civil utility aircraft 1930–1939|Single-engined tractor aircraft|Low-wing aircraft|Aircraft first flown in 1930 |
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