The Sea Dragon was a massive, two-stage rocket concept developed in the early 1960s by aerospace engineer Robert Truax for Aerojet. Designed to be the largest rocket ever conceived, it would have been capable of carrying up to 550 metric tons (1.2 million pounds) of payload into orbit. The rocket was unique in that it was designed to be built with simple, low-cost materials and launched directly from the ocean.The first stage would have used liquid oxygen (LOX) and RP-1 (kerosene), while the sec