Radioplane XKD4R


The Radioplane XKD4R, known by the company designation RP-70, was an American target drone developed by the Radioplane Division of the Northrop Corporation. Although it was not produced in quantity, it was developed into the successful AQM-38.

Radioplane XKD4R-1.jpg
Role Target drone
National origin United States
Manufacturer Radioplane
First flight January 1958
Primary user United States Navy
Developed into AQM-38

Design and developmentEdit

The XKD4R was an air-launched target drone, powered by a single Aerojet solid-fuel rocket engine which exhausted through nozzles located at the trailing edges of the wing.[1] Constructed largely of molded plastic,[1] it utilized an unconventional control configuration, consisting of three canard control fins located forwards, one on top of and one on either side of the fuselage, and fixed horizontal fins at the rear. An autopilot controlled the drone after launch; at the end of an approximately nine-minute flight, a parachute was deployed for recovery.[2]

Operational historyEdit

Conducting its first flight in January 1958,[2] the XKD4R-1 was tested extensively by the United States Navy, launches usually being conducted from McDonnell F3H Demon fighters.[3] Although satisfactory, the RP-70 was not produced; instead, the improved RP-76 was developed, flying in 1959 and being produced for both the U.S. Air Force and Navy, becoming the AQM-38 in 1962.[2]

Specifications (XKD4R-1)Edit

Data from Parsch[2]

General characteristics

  • Crew: None
  • Length: 9 ft 6 in (2.90 m)
  • Wingspan: 5 ft (1.5 m)
  • Gross weight: 305 lb (138 kg)
  • Powerplant: 1 × Aerojet 530NS35 solid-fuel rocket, 37 lbf (0.16 kN) thrust burn time 530 sec


  • Maximum speed: Mach Mach 0.95
  • Endurance: 9 minutes
  • Service ceiling: 60,000 ft (18,000 m)

See alsoEdit

Related development

Aircraft of comparable role, configuration, and era

Related lists


  1. ^ a b "New American Missiles". Flight, 8 February 1957. Volume 71, No. 2507. p.167.
  2. ^ a b c d Parsch 2003
  3. ^ Fahey 1958, p.41.
  • Fahey, James Charles (1958). The Ships and Aircraft of the U.S. Fleet (7th ed.). Washington, DC: Ships and Aircraft Publishers. ASIN B000XG6YU6.
  • Parsch, Andreas (2003). "Radioplane KD4R". Directory of U.S. Military Rockets and Missiles Appendix 1: Early Missiles and Drones. Retrieved 2011-01-28.