| 词条 | Radioplane RP-77 |
| 释义 |
| name = RP-77D | image = Radioplane RP-77D.jpg | image_size = 300 | caption = Radioplane RP-77D target drone | origin = {{flagcountry|USA}} | type = Target drone | is_missile = yes | service = 1958 | used_by = United States Army | designer = | design_date = | manufacturer = Radioplane | production_date = | number = 24 | variants = | spec_label = | weight = {{convert|1050|lb|kg}} | length = {{convert|4.53|m|ft|disp=flip|sp=us}} | part_length = | width = | height = | diameter = | crew = | passengers = | primary_armament = | secondary_armament = | engine = Boeing 502 turboprop | engine_power = {{convert|285|shp|kW|lk=on}} | pw_ratio = | payload_capacity = | fuel_capacity = | vehicle_range = | speed = {{convert|425|mph|km/h}} | guidance = Radio | steering = | wingspan = {{convert|4.66|m|ft|disp=flip|sp=us}} | propellant = | ceiling = {{convert|47000|ft|m}} | altitude = | depth = | boost = | accuracy = | launch_platform = | transport = }} The Radioplane RP-77 was a small target drone missile, constructed largely of plastic materials, produced by the Radioplane division of the Northrop Corporation. Although the RP-77D was successfully tested by the United States Army, the decision was made not to procure the aircraft. Design and developmentThe development of the RP-77 began in 1955.[1] Similar in outline to Radioplane's earlier OQ-19, four prototypes of the RP-77 were constructed, two each of the RP-77, powered by a four-cylinder McCulloch piston engine, and of the RP-77A, powered by a six-cylinder Lycoming engine.[1] Results of flight-testing were insufficient to interest the U.S. Army, however in 1957 a proposal for an improved RP-77D, powered by a Boeing 502 turboprop, resulted in a contract for the construction of 20 aircraft.[1] The design of the RP-77D made extensive use of glass-polyester plastic materials.[2][3] The drone was launched using a rocket-assisted take-off system consisting of four Loki rockets, and was fitted with a radio control apparatus that, with the assistance of radar tracking, allowed the drone to be operated at a considerable distance from its launching point.[1] In addition to equipment typically carried by target drones, the RP-77D could be equipped with reconnaissance or meteorological sensors, or with air sampling equipment.[1] The RP-77D utilised the RPTA tracking system, developed by Radioplane, using audio frequency tones for control.[4] Tip tanks allowed for carriage of additional fuel to extend the aircraft's range, and recovery at the end of the flight was by parachute.[5] An improved version of the RP-77D was projected, with provision for launching RP-76 target missiles.[1] Operational historyFollowing its maiden flight in March 1958, evaluation of the RP-77D by the U.S. Army took place throughout the remainder of that year, nearly 40 test flights being conducted.[1] Although the test results were generally satisfactory, it was determined that the performance of the aircraft was an insufficient improvement over existing types in service to have the aircraft ordered into production, and the project was cancelled, along with the improved RP-86, a dedicated reconnaissance variant.[1] Following the termination of the Army's evaluation, Radioplane, as a private venture, conducted an improvement program for the RP-77D, fitting the aircraft with a larger wing, along with other modifications that improved the performance of the drone. However these improvements were insufficient to produce a renewed interest from the Army.[1] Variants
Prototype model powered by McCulloch piston engine; two built.[1]
Prototype model powered by Lycoming IMO-360 piston engine; two built[1][6]
Proposed version of RP-77 with turbo-supercharged McCulloch engine, none built.[1]
Proposed version of RP-77A with turbo-supercharged Lycoming SO-360M engine, none built.[1][7]
Production prototype with Boeing 502 turboprop; twenty built for evaluation.[1]
Proposed reconnaissance version of RP-77D; none built.[1] Specifications (RP-77D){{Aircraft specs|ref=[1][8] |prime units?=imp |genhide= |crew=None |capacity= |length m=4.53 |length ft= |length in= |length note= |span m=4.66 |span ft= |span in= |span note= |height m=1.58 |height ft= |height in=4 |height note= |wing area sqm= |wing area sqft= |wing area note= |swept area sqm= |swept area sqft= |swept area note= |aspect ratio= |airfoil= |empty weight kg= |empty weight lb= |empty weight note= |gross weight kg= |gross weight lb=1050 |gross weight note= |max takeoff weight kg= |max takeoff weight lb= |max takeoff weight note= |fuel capacity= |more general= |eng1 number=1 |eng1 name=Boeing 502-10F |eng1 type=turboprop |eng1 kw= |eng1 hp= |eng1 shp=285 |eng1 note= |power original= |more power= |prop blade number=2 |prop name= |prop dia m= |prop dia ft= |prop dia in= |prop note=
See also{{Portal|Aviation|United States Army}}{{aircontent||related= |similar aircraft=
|lists= |see also= }} References
1. ^1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Parsch 2004. 2. ^Merrill 1956, p.108. 3. ^Duffin 1958, p.160. 4. ^Interavia p. 359 5. ^Journal of the Royal Aeronautical Society, Volume LXIII, January–December 1959, [https://books.google.com/books?ei=yekYTZP-BoSq8AbQ9dXwDQ&ct=result&id=eUASAAAAIAAJ&dq=Radioplane+RP-77+%22Aeronautical+Journal%22&q=Radioplane+RP-77#search_anchor p.165]. 6. ^Erickson 2009 7. ^Jane's 1958 8. ^The Aeronautical Journal, p.165.
8 : Radioplane aircraft|United States special-purpose aircraft 1950–1959|Single-engined tractor aircraft|High-wing aircraft|Target drones of the United States|Single-engined turboprop aircraft|Cancelled military aircraft projects of the United States|Aircraft first flown in 1958 |
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