Known by the company as RP-50 and designated by the USAF as YQ-1B, the revised drone flew for the first time during 1953, being evaulated by the Air Force later that year.
Six YQ-1Bs were built for evaluation; they proved trouble-free, no production order for the type was undertaken, the competing Ryan Q-2 drone having been selected for operational service instead; as a result, the Q-1 program was terminated [REF].