Juno II Crash скачать в хорошем качестве

Juno II Crash

Credit: Discovery Communications The attempted launch of an Explorer satellite on 16 July 1959 failed dramatically when the Juno II lost control almost immediately at liftoff, performing a cartwheel before the Range safety officer sent the destruct command. The almost fully fueled booster crashed a few hundred feet from the pad, blockhouse crews watching in stunned surprise at the upper stage motors burning on the ground. Cause of the mishap was quickly traced to a short between two diodes in a power inverter, which cut off power to the guidance system at liftoff and caused the Juno's engine to gimbal to full stop, flipping the vehicle onto its side before Range Safety action was taken. To prevent a recurrence of this failure mode, improved coatings were used on the circuit boards in the booster.