Initially, we refueled the B-47 from the Boeing KC-97. Despite its four big Pratt & Whitney 4360 radial engines and two J47 jet engines, the KC-97 had trouble refueling the B-47 because it was so ...

Vigorous trials of the X-47 B’s took place on the USS Theodore Roosevelt ... However, the project led to the Carrier-Based Aerial Refueling System research and development of the MQ-25 Stingray.