Dominico reported that the bomb had been dismantled. Rip went to it and examined the raw plutonium, being careful to keep the pieces widely separated.
This particular bomb design used five pieces of plutonium which were driven together to form a ball. Rip made a quick estimate. Two were enough to form a critical mass. He would use two to blast into the sun and three to blast out again. He would need the extra kick.
There was only one trouble. The pieces were wedge shaped. They would have to be mounted in thorium in order to keep them rigid. Only Kemp could do that. They had no cutting tool but the torch.
Santos appeared, carrying a rocket head under each arm. They had wires wound around them, ready to be attached to an electrical source.
Rip hurried back to where Kemp was at work. The private was using a cutting nozzle that threw an almost invisible flame five feet long. In air, the nozzle wouldn’t have worked effectively beyond two feet, but in space it cut right down to the end of the flame. Kemp had his arm inside the hole and was peering past it as he finished the cut.
“Done, sir,” he said, and adjusted the flame to a spout of red fire. He thrust the torch into the hole and quickly withdrew it as pieces of thorium flew out. A stream of water hosed into the tube would have worked the same way.
Rip took a block of plutonium from Dominico and handed it to Kemp. “Cut a plug and fit this into it. Then cut a second plug for the other piece. They have to match perfectly, and you can’t put them together to try out the fit. If you do, we’ll have fission right here in the open.”
Kemp searched and found a piece he had cut in making the tube. It was perfectly round, ideal for the purpose. He sliced off the inner side where it tapered to a cone, then, working only by eye estimate, cut out a hole in which the wedge of fission material would fit. He wasn’t off by a thirty-second of an inch. Skillful application of the torch melted the thorium around the wedge and sealed it tightly.
Koa was ready with a sheet of nuclite. Trudeau arrived with a pole made by lashing two crate sticks together.
Rip gave directions as they formed a cylinder of nuclite. Kemp spot-welded it, and they pushed it into the hole.
Nunez found a small piece of material in one of the earlier craters. It would provide some neutrons to start the chain reaction. Rip added it to the front of the plutonium wedge, along with a piece of beryllium from the bomb, and Kemp welded it in place.
They put the thorium block which contained the plutonium into the hole, the plutonium facing outward. Trudeau rammed it to the bottom with his pole. The neutron source, the neutron reflector, and one piece of fissionable material were in place.
Kemp sliced another round block of thorium out of a nearby crystal and fitted the second wedge of plutonium into it. At first Rip had worried about the two pieces of plutonium making a good enough contact, but Kemp’s skillful hand and precision eye removed that worry.
The torchman finished fitting the plutonium and carried the block to the tube opening. He tried it, removed a slight irregularity with his torch, then said quietly, “Finished, sir.”
Rip took over. He slid the thorium-plutonium block into the tube, took a rocket head from Santos, and used it to push the block in farther. When the rocket head was about four inches inside the tube, its wires trailing out, Rip called Kemp. At his direction, the torchman sliced a thin slot up the face of the crystal. Rip fitted the wires into it and held them in place with a small wedge of thorium.
Kemp cut a plug, fitted it into the hole, and welded the seams closed. The tube was sealed. When electric current fired the rocket head, the thorium carrying the plutonium wedge would be driven forward to meet the wedge in the back. And, unless Rip had miscalculated the mass of the two pieces, they would have their nuclear blast. Rip surveyed the crystal with some anxiety. It looked right.
Dominico already had rigged the timer from the atomic bomb. He connected the wires. “Do I set it, sir?”
“Load the communicator, the extra bomb parts, the rocket launcher and rockets, the cutting equipment, my instruments, and the tubes of fuel,” Rip ordered. “Leave everything else in the cave.”
The Planeteers ran to obey. Rip waited until the landing boat was nearly loaded, then told Dominico to set the timer for five minutes. He wondered how they would explode the second charge, since they had only the one timer left, then forgot about it. Time enough to worry when faced with the problem.
“I’ll take the snapper-boat,” he stated. “Santos in the gunner’s seat. Koa in charge in the landing boat. Dowst pilot. Let’s show an exhaust.”
He fitted himself into the tight pilot seat of the snapper-boat while Santos climbed in behind. Then, handling the controls with the skill of long practice, he lifted the tiny fighting rocket above the asteroid and waited for the landing boat. When it joined up, Rip led the way to safety. As he cut his exhaust to wait for the explosion, he sighted past the snapper-boat’s nose to the asteroid.
Even though both boats had been careful to match velocity with the asteroid as closely as possible, the slight difference remaining caused them to drift sunward. Rip cut his jets in to compensate, and saw Dowst do the same.
Another few miles toward the sun, and the landing boat wouldn’t have the power to get away from Sol’s gravity. A few miles beyond that, even the powerful little snapper-boat would be caught.
Below, the timer reached zero. A mighty fan of fire shot into space. The asteroid shuddered from the blast, then swerved gradually, picking up speed as well as new direction.
Rip swallowed hard. Now they were committed. They would reach a new perihelion far beyond the limits of safety. P for perihelion and P for peril. In this case, they were the same thing!
CHAPTER 14
Between Two Fires
Back on the asteroid, the Planeteers started laying the second atomic charge. Rip selected the spot, found a nearby crystal that would serve to house the bomb, and Kemp started cutting.
The Planeteers knew what to do now, and the work went rapidly. Rip kept an eye on his chronometer. According to the message from Terra base, he had about fifteen minutes before the Consops cruiser arrived.
“We have one advantage we didn’t have back in the asteroid belt,” he remarked to Koa. “Back there they could have landed anywhere on the rock. Now they have to stick to the dark side. Snapper-boats could last on the sun side, but men in ordinary space suits couldn’t.”
“That’s good,” Koa agreed. “We have only one side to defend. Why don’t we put the rocket launcher right in the middle of the dark side?”
“Go ahead. And have all men check their pistols and knives. We don’t know what’s likely to happen when that Connie flames in.”
Rip walked over to the communicator and plugged his suit into the circuit. “This is the asteroid calling Terra base. Over.”
“This is Terra base. Go ahead, Foster. How are you doing?”
“If you need anything cooked, send it to us,” Rip replied. “We have heat enough to cook anything, including tungsten alloy.” He explained briefly what action they had taken.
A new voice came on the communicator. “Foster, this is Colonel Stevens.”
Rip responded swiftly, “Yes, sir!” Stevens was the top Planeteer, commanding officer of all the Special Order Squadrons.
“We’ve piped this circuit into every channel in the system,” the colonel said. “Every Planeteer in the Squadrons is listening and rooting for you. Is there anything we can do?”
“Yes, sir,” Rip replied. “Do you know if Terra base has been plotting our course this far?”
There was a brief silence, then the colonel answered, “Yes, Foster. We have a complete track from the time you started showing on the Terra screens, about halfway between the orbits of Mars and Earth.”
“Did you just get our change of direction?”
“Yes. We’re following you on the screens.”
“Then, sir, I’d appreciate it if you’d put the calculators to work and make a time-d
istance plot for the next few hours. The blast we’re saving to push to escape velocity is about three kilotons. Let us know the last moment when we can fire.”
“You will have it within fifteen minutes. Anything else, Foster?”
“Nothing else I can think of, sir.”
“Then, good luck. We’ll be standing by.”
“Yes, sir. Foster off.”
Rip disconnected and turned up his helmet communicator, repeating the conversation to his men. Koa came and stood beside him. “Lieutenant, how do we set off this next charge?”
There was only one way. When the time came to blast, they would be too close to the sun to take to the boats. The blast had to be set off from the asteroid.
“We’ll get underground as far away from the bomb as we can,” Rip said. He surveyed the dark side, which was rapidly growing less dark. “I think the second crater will do. Kemp can square it off on the side toward the blast to give us a vertical wall to hide behind.”
Koa looked doubtful. “Plenty of radiation left in those holes, sir.”
Rip grinned mirthlessly. “Radiation is the least of our problems. I’d rather get an overdose of gamma then get blasted into space.”
A yell rang in his helmet. “Here comes the Connie!”
Rip looked up, startled. The Consops cruiser passed directly overhead, about ten miles away. It was decelerating rapidly. Rip wondered why they hadn’t spotted it earlier, then realized the Connie had come from the direction of the hot side.
The enemy cruiser was probably the same one that had attacked them before. He must have lain in wait for days, keeping between the sun and Terra. That way, the screens wouldn’t pick him up, since very few observatories scanned the sun with regularity. To the observatories, the cruiser would have been only a tiny speck, too small to be noticed. Or, if they had noticed it, the astronomers probably decided it was just a very tiny sunspot.
The Planeteers worked with increased speed. Kemp welded the final plug into place, then hurried to the crater from which they would set off the charge. Dominico and Dowst connected wires from the rocket head to a reel of wire and rolled it toward the crater. Nunez got a hand-driven dynamo from the supplies and tested it for use in setting off the charge. Santos stood by the rocket launcher, with Pederson ready to put another rack of rockets into the device when necessary.
Rip and Koa watched the Connie cruiser. It decelerated to a stop for a brief second, then started moving again, with no jets showing.
“That’s the sun pulling,” Rip said exultantly.
“They’ll have to keep blasting to maintain position.”
The Consops commander didn’t wait to trim ship against the sun’s drag. His air locks opened, clearly visible to Rip and Koa because that side of the cruiser was brilliant with sunlight. Ten snapper-boats sped forth. Rip was certain now that this was the enemy cruiser they had fought off back in the asteroid belt. Two Connie snapper-boats had been destroyed in that clash, which explained why the commander was sending out only ten boats instead of a full quota of twelve.
The squadron instantly formed a V, like a strange space letter made up of globes. The sun’s gravity pulled at them, dragging them off course. Rip watched as flames poured from their stern tubes. They were firing full speed ahead, but the drag of the sun distorted their line of flight into a great arc.
Rip saw the strategy instantly. The Connie commander knew the situation exactly, and he was staking everything on one great gamble, sending his snapper-boats to land on the asteroid—to crash-land if necessary.
The asteroid was so close to the sun that even the powerful fighting rockets would use most of their fuel in simply combating its gravity.
“All hands stand by to repel Connies,” Rip shouted, and he drew his pistol. He looked into the magazine, saw that the clip was full, and then charged the weapon.
Santos was crouched over the rocket launcher, his space gloves working rapidly as he kept the rockets pointed at the enemy.
Rip called, “Santos, fire at will.”
The Planeteers formed a skirmish line which pivoted on the launcher. Only Kemp remained at work. His torch flared, slicing through the thorium as he prepared their firing position.
The atomic charge was ready. The wires had been laid up to the rim of the crater in which Kemp worked, and the dynamo was attached.
Rip was everywhere, checking on the launcher, on Kemp, on the pistols of his men. And Santos, hunched over his illuminated sight, watched the Connie snapper-boats draw near.
“Here we go,” the corporal muttered. He pressed the trigger.
The first rocket sped outward in a sweeping curve, and for a moment Rip opened his mouth to yell at Santos. The sun’s gravity affected the attack rockets, too! Then he saw that the corporal had allowed for the sun’s pull.
The rocket curved into the squadron of on-coming boats, and they all tried to dodge at once. Two of them met in a sideways crash, then a third staggered as its stern globe flared and exploded. Santos had scored a hit!
Rip called, “Good shooting!”
The corporal’s reply was rueful. “Sir, that wasn’t the one I aimed at. The sun’s pull is worse than I figured.”
The damaged snapper-boat instantly blasted from its nose tubes, decelerated, and went into reverse, flipping through space crabwise as it tried to regain the safety of the cruiser. The two boats that had crashed while trying to dodge were blasting in great spurts of flame, following the example of their damaged companion.
“Seven left,” Rip called, and another rocket flashed on its way. He followed its trail as it curved away from the asteroid and into the squadron. Its proximity fuse detonated in the exhaust of a Connie boat, blowing the tube out of position. The boat yawed wildly, cut its stern tubes, and blasted to a stop from the bow tube. Then it, too, started backward toward the cruiser. Six left!
Flame blossomed a few yards from Rip. He was picked up bodily and flung into space, whirling end over end. Koa’s voice rang in his helmet.
“Watch it! They’re firing back!”
Rip tugged frantically at an air bottle in his belt. He pulled it out and used it to whirl him upright again; then its air blast drove him back to the surface of the asteroid. Sweat poured from his forehead, and the suit ventilator whined as it picked up the extra moisture. Great Cosmos! That was close!
Santos fired again, twice, in rapid succession. The Connie snapper-boats scattered as the proximity fuses produced flowers of fire among them. Two near misses, but they threw the enemy off course. Rip watched tensely as the boats fought to regain their course. He knew asteroid, cruiser, and boats were speeding toward the sun at close to fifty miles a second, and the drag was getting terrific. The Connies knew it, too.
There was an exultant yell from the Planeteers as two of the boats gave up and turned back, using full power to regain the safety of the mother ship. Four left!
Santos scored a direct hit on the nose of the nearest one, but its momentum drove it to within a few yards of the asteroid. Five space-suited figures erupted from it, holding hand propulsion units, tubes of rocket fuel used for hand combat in empty space.
The Connies lit their propulsion tubes and drove feet first for the asteroid. The Planeteers estimated where the enemy would land, and they were there waiting, with aimed handguns. The Connies had their hands over their heads, holding the propulsion tubes. They took one look at the gleaming Planeteer guns, and their hands stayed upright.
The Planeteers lashed the Connies’ hands behind them with their own safety lines and, at Rip’s orders, dumped all but one of them into the crater where Kemp was just finishing his cutting.
Three snapper-boats remained. Rip watched, holding tightly to the arm of the Connie he had kept at his side. The man wore the insignia of an officer.
The remaining snapper-boats were going to make it. Santos threw rockets among them and scored hits, but the boats kept coming. The Connies were too far away from the cruiser to return, and they knew it. Gett
ing to the asteroid was their only chance.
Rip called, “Santos! Cease fire. Set the launcher for ground level. Let them land, but don’t fire until I give the word.”
He put his helmet against his prisoner’s for direct communication. “You speak English?”
The man shouted back, “Yes.”
“Good. We’re going to let your friends land. As soon as they do, I want you to yell to them. Say we have assault rockets trained on them. Tell them to surrender, or they’ll be killed in their tracks. Got that?”
The Connie replied, “Suppose I refuse?”
Rip put his space knife against the man’s stomach. “Then we’ll get them with rockets. But you won’t care, because you won’t know it.”
The truth was that Santos couldn’t hope to get them all with his rockets. They might overcome the Connies in hand-to-hand fighting, but there would be a cost to pay in Planeteer casualties. Rip hoped the Connie wouldn’t call his bluff, because that’s all it was. He couldn’t use a space knife on an unarmed prisoner.
The Connie didn’t know that. In Rip’s place he would have no compunctions about using the knife, so instead of calling Rip’s bluff, he agreed.
The snapper-boats blew their front tubes, decelerating, and squashed down to the asteroid in a roar of exhaust flames, sending the Planeteers running out of the way. Rip thrust harder with his space knife and yelled, “Tell them!”
The Connie officer nodded. “Turn up my communicator.”
Rip turned it on full, and the Connie barked quick instructions. The exhausts died, and five men filed out of each boat, with hands held high. Rip blew a drop of perspiration from the tip of his nose. Empty space! It was a good thing Connie morale was bad. The enemy’s willingness to surrender had saved them a costly fight.
The Planeteers rounded up the prisoners and secured them, while Rip took an anxious look at the communicator. It was about time he heard from Terra base.
The light was glowing. For all he knew, it might have been glowing for many minutes. He plugged into the circuit.
The Tom Corbett Space Cadet Megapack: 10 Classic Young Adult Sci-Fi Novels Page 127
