Welcome to the Rocket Profile of the Juno 1, the rocket that launched America's first satellite, Explorer 1. The main engine for the Juno 1 was a rocket-dyne A7 in a stretched redstone stage similar to the one that would eventually launch Alan Shepard America's first astronaut on his sub-overdough flight, the A7 produced 416 kilnutons of thrust for 2 minutes and 35 seconds with a sea level-specific impulse of 235 seconds. Unlike Alan Shepard's rocket, he used high-dine, which is a mix of UDMH, Enzymetrical Dimeyethylhydrazine, and DETA, diethyl and atriumine, and liquid oxygen for oxidizer. The original redstone engine used 75% ethyl alcohol, and high-dine was invented by Mary Sherman Morgan to give better performance, however she wanted to name the new fuel bagel, so that the propellant combination would be bagel and locks. The A7 and Alan Shepard's rocket went back to Ethyl alcohol to avoid the toxicity of high-dine. The redstone and A7 were designed by Werner von Braun and were direct descendants from his V2 rockets, which used the A4 engine, which had this 75% ethyl alcohol fuel. Redstone rockets using high-dine are considered part of the Jupiter-C family. After the redstone stage completes its burn, the instrument unit with RCS units in the cone on top of the stage aims to three remaining stages, a cluster of 11 sergeants saw a rocket motors, a cluster of three of them, and then a final single sergeant rocket motor, and spins stabilizes them ahead of a rival at Apple Applesis. The three stages of SRBs each last for six seconds, so they help the tiny Explore-1 payload make orbit right at Apple Applesis. Each sergeant has a specific impulse of 235 seconds in vacuum and produces 6.7 kilnunes, so the 11 sergeant stage will provide 73.7 kilnunes, the three sergeant stage gives 20.1 kilnunes, and the final stage just provides the 6.7 kilnunes. Each sergeant has a mass of about 27 kilograms. The payload to orbit of the Juno 1 is 11 kilograms, it had three successes and three failures. The first launch Explore-1 was successful, on Explore-2 the final stage in the ignite, Explore-3 made orbit, Explore-4 made orbit, Explore-5 failed because the first stage clad with the upper stages, on the final launch with Project Echo, inflatable satellite, the second stage separated early, leading to a failed launch there. Explore-1 of course was the first spacecraft to detect the Van Allen radiation belts. And on that note, thank you for watching this rocket profile, and Juno 1.