The B41, a thermonuclear weapon, is the most powerful nuclear warhead ever developed by the US. It’s a gravity bomb with a mass of 4800 kg, 3.76 m in length, with a diameter of 1.32 m and a weight of 4,850 kg. It was carried only by the B-52 Stratofortress and B-47 Stratojet. The bomb was retired in 1957. 10. P-270 Moskit. This missile has a top speed of Mach 3. It’s a Russian supersonic.