He was grimly alert, just the same. There were men waiting for them to start back to the car. These saboteurs were armed, and they intended to murder Sally and himself. Joe’s jaws clamped tautly shut at the grim ideas that came into his mind.
But Mike was beginning to speak.
“Forget about the Platform a minute,” he said, standing up to gesticulate, because he was only three and a half feet high. “Just figure on a rocket straight to the moon. With old-style rockets they’d a’ had to have a mass ratio of a hundred and twenty to one. You’d have to burn a hundred and twenty tons of old-style fuel to land one ton on the moon. Now it could be done with sixty, and when the Platform’s up, that figure’ll drop again! Okay! You’re gonna land a man on the moon. He weighs two hundred pounds. He uses up twenty pounds of food and drink and oxygen a day. Give him grub and air for two months—twelve hundred pounds. A cabin seven feet high and ten feet across. Sixteen hundred pounds, counting insulation an’ braces for strength. That makes a pay load of a ton an’ a half, and you’d have to burn a hundred an’ eighty tons of fuel—old-style—to take it to the moon, and another hundred an’ twenty for every ton the rocket ship weighed. You might get a man to the moon with a twelve-hundred-ton rocket—maybe. That’s with the old fuels. He’d get there, an’ he’d live two months, an’ then he’d die for lack of air. With the new fuels you’d need ninety tons of fuel to carry the guy there, and sixty more for every ton the ship weighed itself. Call it six hundred tons for the rocket to carry one man to the moon.”
Sally nodded absorbedly.
“I’ve seen figures like that,” she agreed.
“But take a guy like me!” said Mike the midget bitterly. “I weigh forty-five pounds, not two hundred! I use four pounds of food and air a day. A cabin for me to live in would be four feet high an’ five across. Bein’ smaller, it wouldn’t need so much bracing. You could do it for two hundred pounds. Three hundred for grub and air, fifty for me. Me on the moon supplied for two months would come to five-fifty pounds. Sixteen tons of fuel to get me to the moon direct! To carry the weight of the ship—it’s smaller!—fifty tons maximum!”
“I—see...,” said Sally, frowning.
He looked at her suspiciously, but there was no mockery in her face.
“It’d take a six-hundred-ton rocket to get a full-sized man to the moon,” he said with sudden flippancy, “but a guy my size could do the same job of stranglin’ in a fifty-ton job. Counting how much easier it’d be to get back, with atmosphere deceleration, I could make a trip, land, take observations, pick up mineral specimens, and get back—all in a sixty-ton rocket. That’s just ten per cent of what it’d cost to take a full-sized man one way!”
He stamped his foot. Then he said coldly: “Haney, sittin’ still you’re a sittin’ duck!”