BQ-7. Late in World War II, at least 25 B-17s were fitted with radio controls as BQ-7 drones for Operation Aphrodite. Loaded with 20,000 lb (9,100 kg) of Torpex high explosive and enough fuel for 350 mi (560 km), they were to be used to attack Nazi U-boat pens, V-1 flying bomb sites, and bomb-resistant fortifications. The BQ-7s would be taken up to 2,000 ft (610 m) by two volunteers before transferring control to another B-17 and bailing out while still over England. The controlling B-17 would follow the BQ-7, aim to at the target and set its controls for a collision course, before itself returning. The normal cockpit lost its roof and the fairing behind it was removed. Because the remote-control hardware was inadequate, Operation Aphrodite was riddled with problems. Between August 1944 and January 1945, 15 BQ-7s were launched against Germany, but none hit their targets, and several crew were killed, many in parachuting accidents. One BQ-7 left a 100 ft (30 m) crater in Britain a...