Following flight trials of the XKD4R target drone, developed for the United States Navy, Radioplane redesigned the aircraft into an improved version, designated RP-76, which first flew in 1959.
Compared to the XKD4R, the RP-76 had redesigned wing fairings, with the vertical control fin being moved to the underside of the missile, as opposed to being on top.

The RP-76 was designed to fly a pre-programmed trajectory on autopilot, with radio command guidance being optional.
As with the XKD4R, control was provided by three fins located forwards on the body of the craft.
A Luneberg lens was included to augment the drone's radar signature, and recovery at the end of the flight was by parachute.
Following flight trials of the XKD4R target drone, developed for the United States Navy, Radioplane redesigned the aircraft into an improved version, designated RP-76, which first flew in 1959. Compared to the XKD4R, the RP-76 had redesigned wing fairings, with the vertical control fin being moved to the underside of the missile, as opposed to being on top.
The RP-76 was designed to fly a pre-programmed trajectory on autopilot, with radio command guidance being optional. As with the XKD4R, control was provided by three fins located forwards on the body of the craft. A Luneberg lens was included to augment the drone's radar signature, and recovery at the end of the flight was by parachute.
Northrop AQM-38