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Updated: May 4, 2025
"It has to do with the pumps," replied the power-deck cadet. "They cool the reactant fuel to keep it from getting too hot and wildcatting. At a D-9 rate the reactant is hot enough to create power for normal flight. Feeding at a D-18 rate is fine too, but you need pumps to cool the motors, and pumps that could do the job would be too big."
They were dressed in the mode of merchant space officers, wearing high-peaked hats, trim jackets, and trousers of a different color. Strong stood up to greet them. "Welcome, gentlemen. Please be seated. We will begin the meeting as soon as all the pilots are here." Roger nudged Astro and whispered, "What's the big deal about a D-18 rate and a D-9 rate? Why is that so important?"
"Did what?" demanded Kit. "You know that by-pass feeder you said wouldn't hold a pressure of more than D-18 rate?" said Astro eagerly. When Kit nodded, Astro roared triumphantly, "Well, it'll hold more than D-18 rate now!" "What do you mean?" demanded Kit.
Astro's involved and detailed reply in engineering terms was almost gibberish to Tom, but he understood enough of the unit construction to sense that Astro had done something extraordinary. "And he did it all himself, too," said Sid quietly. "I didn't do any more than hold the tools." "But I still don't understand," protested Kit. "The by-pass won't take more than D-18."
He's running too close to the danger point in feeding reactant to the chambers, using D-18 rate of feed and D-9 is standard." "What about the other ships, sir?" asked Tom. "Do they all have safety factors?" Strong shrugged his shoulders. "They all specify standard reaction rates without actually using figures," he said. "But I'm certain that their feeders are being tuned up for maximum output.
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