| 词条 | Republic SD-3 Snooper | |||||||||||||||||
| 释义 |
The Republic SD-3 Snooper was an early reconnaissance drone developed by Republic Aviation for the United States Army. It was evaluated by the Army Signal Corps in 1959, but did not enter operational service. Design and developmentThe Guided Missiles Division of Republic Aviation was awarded a contract for development of a short-range reconnaissance drone in 1957,[1] winning a competition conducted by the U.S. Army to fill the requirement. Given the overall designation AN/USD-3 for the entire system, and sometimes referred to as Sky Spy,[2] the Snooper was of twin-boom configuration, a single Continental IO-200 horizontally-opposed piston engine being mounted in a pusher configuration.[3] The drone was capable of flying for up to 30 minutes, allowing it to overfly multiple reconnaissance targets during a single flight.[1] Launch was from a zero-length launch setup, two rocket boosters burning solid fuel being used to assist the aircraft into flight; following a mission, which could either use autopilot control following a programmed course or radio command guidance from a ground station,[3] the Snooper would land via parachute; airbags were installed in the airframe to cushion the landing.[1] The SD-3's nose section was designed to be interchangeable among a number of payloads; options included television, aerial photography, infrared photography, or radar systems.[4] Operational historyRevealed to the press in late 1958,[5] the SD-3 first flew in January 1959; following manufacturer's trials, the U.S. Army ordered fifty pre-production aircraft to conduct a full evaluation of the system.[3] Although the trials, conducted by the Signal Corps,[6] were considered successful,[1] the Army cancelled the SD-3 program at the end of the trials.[7] However, the SD-3's twin-boom pusher design would become commonly used by unmanned aerial vehicles in later years.[2] Specifications{{Aircraft specs|ref=Parsch 2004[3] |prime units?=imp |crew=None |capacity= |length m= |length ft=15 |length in=3 |length note= |span m= |span ft=11 |span in=2 |span note= |height m= |height ft= |height in= |height note= |wing area sqm= |wing area sqft= |wing area note= |aspect ratio= |airfoil= |empty weight kg= |empty weight lb= |empty weight note= |gross weight kg= |gross weight lb=1000 |gross weight note= |max takeoff weight kg= |max takeoff weight lb= |max takeoff weight note= |fuel capacity= |more general= |eng1 number=1 |eng1 name=Continental IO-200 |eng1 type=horizontally opposed piston engine |eng1 kw= |eng1 hp=100 |eng1 note= |power original= |more power= |prop blade number= |prop name= |prop dia m= |prop dia ft= |prop dia in= |prop note= |max speed kmh= |max speed mph=300 |max speed kts= |max speed note= |max speed mach= |cruise speed kmh= |cruise speed mph= |cruise speed kts= |cruise speed note= |stall speed kmh= |stall speed mph= |stall speed kts= |stall speed note= |never exceed speed kmh= |never exceed speed mph= |never exceed speed kts= |never exceed speed note= |range km= |range miles=100 |range nmi= |range note= |combat range km= |combat range miles= |combat range nmi= |combat range note= |ferry range km= |ferry range miles= |ferry range nmi= |ferry range note= |endurance=30 minutes |ceiling m= |ceiling ft=20000 |ceiling note= |g limits= |roll rate= |glide ratio= |climb rate ms= |climb rate ftmin= |climb rate note= |time to altitude= |lift to drag= |wing loading kg/m2= |wing loading lb/sqft= |wing loading note= |disk loading kg/m2= |disk loading lb/sqft= |disk loading note= |fuel consumption kg/km= |fuel consumption lb/mi= |power/mass= |thrust/weight= |more performance= |avionics= }} See also{{aircontent|see also= |related= |similar aircraft=
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}} ReferencesCitations1. ^1 2 3 Ordway and Wakeford 1960, p.USA50. 2. ^1 Newcome 2004, p.75. 3. ^1 2 3 Parsch 2004 4. ^Aviation Week, Volume 70, 1959; [https://books.google.com/books?id=aIZKAQAAIAAJ&dq=Republic+SD-3+Snooper&focus=searchwithinvolume&q=Snooper page 58]. 5. ^{{cite news|title=Sky Spy|work=The Vernon Daily Record|location=Vernon, TX|date=November 16, 1958|page=5}} 6. ^{{cite magazine|title=JATO Snooper Missile Has Changeable Nose|url= https://books.google.com/books?id=5t0DAAAAMBAJ&pg=PA96&dq=Republic+SD-3+Snooper&hl=en|magazine=Popular Mechanics|location=Chicago|publisher=Popular Mechanics Co.|date=March 1958|volume=109|issue=3|page=96|access-date=2017-12-09}} 7. ^Astronautics Volume 6 part 1, 1961. American Rocket Society. [https://books.google.com/books?id=xFZKAQAAIAAJ&dq=U.S.+Army+%22SD-2%22+%22SD-3%22+Aerojet&focus=searchwithinvolume&q=SD-3 p.8]. Bibliography{{refbegin}}
7 : Republic aircraft|United States military reconnaissance aircraft 1950–1959|Mid-wing aircraft|Single-engined pusher aircraft|Twin-boom aircraft|Aircraft first flown in 1959|Unmanned military aircraft of the United States |
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