Getting History Off the Ground

In the infant days of America’s space program, many early rockets rose only a few feet from their launch platforms before falling back and exploding, showing that larger rockets had to be held on the platform until their liquid-fuel engines built enough thrust for a safe liftoff. This hold-down arm was one of eight, one under each fin of the Saturn 1B, that kept the giant rocket in place during those critical seconds. The rocket’s entire weight rested on the hold-down arms and was secured only by hooks painted yellow for easy identification. Each arm contained an explosive release device that was electrically activated when maximum thrust was reached. The arms also held the rocket in place during transport to the launch pad and in high winds.

Florida · United States