They had two fuses, so they had a 2:1 safety margin! Just like the NASA managers who decided that 30% erosion in an O-ring designed for no erosion meant a 3:1

They had two fuses, so they had a 2:1 safety margin! Just like the NASA managers who decided that 30% erosion in an O-ring designed for no erosion meant a 3:1 safety margin.