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Updated: June 25, 2025
"Six hundred from the pushpots," murmured Haney, frowning, "an' three hundred from the jet stream, and then there was the jatos that all let go at once, an' then there was eight hundred from the earth rotatin' " "They had ten per cent of their rockets unfired when they got into their orbit," said Mike authoritatively.
The Major, to do him justice, had the gift of listening. He waited. "The pushpots," said Joe, very carefully, "naturally have their fuel stored in different tanks in different places, as airplanes do. The pilots switch on one tank or another just like plane pilots. In the underground storage and fueling pits, where all the fuel for the pushpots is kept in bulk, there are different tanks too.
When they get down, a big straddle truck on caterpillar treads picks them up they land in the doggonedest places, sometimes! and brings 'em back. Then a crane heaves them up on a high-speed truck and they do it all over again." Joe considered while he ate. It made sense. The function of the pushpots was to serve as the first booster stage of a multiple-stage rocket.
It didn't try to make a spiral approach as all other ships had done. It came straight up, and it started from the ground. No pushpots. Its take-off rockets were monsters. They pushed upward at ten gravities until it was out of atmosphere, and then they stepped up to fifteen. Much later, the robot turned on its side and fired orbital speed rockets to match velocity with the Platform.
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