| 词条 | Lockheed Little Dipper | |||||||||||
| 释义 |
The Lockheed Model 33 Little Dipper, also known as Air Trooper, was an American single-seat monoplane, designed by John Thorp and built by Lockheed at Burbank, California. Flown in 1944 and offered to the Army as a "flying motorcycle", it was evaluated as a potential entry for Lockheed into the civilian market, but the program was cancelled before the second prototype was completed. Design and developmentThe design of the Model 33 originated with a private venture for a two-seat light aircraft by John Thorp, a Lockheed engineer.[1] In April 1944, the company agreed to build the aircraft as the Lockheed Model 33.[1] Due to wartime restrictions on materials,[1] the company gained the interest of the United States Army in the aircraft as an "aerial flying motorcycle" to equip a "flying cavalry" under the name Air Trooper.[2] The Army, willing to entertain the concept, authorized Lockheed to build two prototypes of the Model 33.[1] The Model 33 was of ordinary light-aircraft design, with a low-mounted cantilever monoplane wing and conventional empennage; powered by a {{convert|50|hp|kW|abbr=on|0}} Franklin 2A4-49 engine, it was fitted with a fixed tricycle landing gear and proved to have STOL performance.[1] Operational historyThe Model 33 prototype first flew in August 1944.[1] The handling characteristics of the aircraft were considered satisfactory,[3] but the Army had lost interest in the concept,[1] despite the prototype demonstrating its performance by landing and taking off again in the courtyard of the Pentagon.[4] Lockheed had intended to market the type as an inexpensive light aircraft on the civilian market as the Little Dipper; with the military interest having evaporated, the prototype and the partially completed second aircraft were scrapped in January 1947 for tax reasons.[1] Thorp, the aircraft's designer, would go on to develop the Thorp T-211 with lessons learned from the Little Dipper project.[5] Specifications{{Aircraft specs|ref=Francillion 1982[1] |prime units?=imp |crew=One (pilot) |capacity= |length m=5.33 |length ft= |length in= |length note= |span m=7.62 |span ft= |span in= |span note= |height m=2.13 |height ft= |height in= |height note= |wing area sqm= |wing area sqft=104 |wing area note= |aspect ratio= |airfoil= |empty weight kg= |empty weight lb=425 |empty weight note= |gross weight kg= |gross weight lb=725 |gross weight note= |max takeoff weight kg= |max takeoff weight lb= |max takeoff weight note= |more general= |eng1 number=1 |eng1 name=Franklin 2A4-49 |eng1 type=two-cylinder air-cooled horizontally opposed piston engine |eng1 kw= |eng1 hp=50 |eng1 note= |power original=
}} See also{{commons category|Lockheed Model 33 Little Dipper}}{{aircontent|see also= |related= |similar aircraft=
|lists= }} ReferencesCitations1. ^1 2 3 4 5 6 7 8 Francillon 1982, pp. 256-257. 2. ^Ingalls 1973, p. 108. 3. ^Badrocke and Gunston 1998, p.36. 4. ^{{cite magazine|title=Designer John Thorp Dies|magazine=Flying|date=July 1992|volume=119|issue=7|page=26|publisher=Hatchette Magazines|location=New York|url=https://books.google.com/books?id=gPYeTL0rPoYC&pg=PA30&dq=Lockheed+%22Little+Dipper%22&hl=en&sa=X&ved=0ahUKEwi4m4yS_43YAhXIYiYKHVknAf84FBDoAQg-MAY#v=onepage&q=Lockheed%20%22Little%20Dipper%22&f=false|accessdate=16 December 2017}} 5. ^{{cite magazine|title=The Thorp Sky Skooter|magazine=Flying|date=August 1947|volume=41|issue=2|page=44|publisher=Ziff-Davis Publishing|location=Chicago|url=https://books.google.com/books?id=jo9drqLI1LwC&pg=PA44&dq=Lockheed+%22Little+Dipper%22&hl=en&sa=X&ved=0ahUKEwjhsfeugY7YAhUKLyYKHcZbAAUQ6AEIMzAC#v=onepage&q=Lockheed%20%22Little%20Dipper%22&f=false|accessdate=16 December 2017}} Bibliography{{refbegin}}
External links
5 : Lockheed aircraft|United States civil utility aircraft 1940–1949|Single-engined tractor aircraft|Low-wing aircraft|Aircraft first flown in 1944 |
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