Planets move as time goes by. A course calculated for a specific launch date will work only for that date. Even a single day’s difference would result in missing Mars entirely.
So Rich had to calculate
He began an email to his boss.
Mike, he typed, Attached are the courses for Iris, in 1-day increments. We should start peer-review and vetting so they can be officially accepted. And you were right, I was here almost all night.
It wasn’t that bad. Nowhere near the pain of calculating orbits for Hermes. I know you get bored when I go in to the math, so I’ll summarize: The small, constant thrust of Hermes’s ion drives is much harder to deal with than the large point-thrusts of presupply probes.
All 25 of the courses take 414 days, and vary only slightly in thrust duration and angle. The fuel requirement is nearly identical for the orbits and is well within the capacity of EagleEye’s booster.
It’s too bad. Earth and Mars are really badly positioned. Heck, it’s almost easier to-
He stopped typing.
Furrowing his brow, he stared in to the distance.
“Hmm.” he said.
Grabbing his coffee cup, he went to the break room for a refill.
“I know you’re all busy,” Teddy said, “so let’s make this fast. I need status on Project Iris from all departments. Venkat, let’s start with you.”
“The mission team’s ready,” Venkat said. “There was a minor turf war between the Ares-3 and Ares-4 presupply control teams. The Ares-3 guys said they should run it, cause while Watney’s on Mars, Ares-3 is still in progress. The Ares-4 team points out it’s their co-opted probe in the first place. I ended up going with Ares- 3.”
“Did that upset Ares-4?” Teddy asked.
“Yeah, but they’ll get over it. They have 13 presupply missions coming up. They won’t have time to be pissy.”
“Mitch,” Teddy said to the flight controller, “What about the launch?”
“We’ve got a control room ready,” Mitch replied. “I’ll oversee the launch, then hand cruise and landing over to Venkat’s guys.”
“Media?” Teddy said, turning to Annie Montrose.
“I’m giving daily updates to the press,” she said. “Everyone knows Watney’s fucked if this doesn’t work. The public hasn’t been this engaged in ship construction since Apollo 11. CNN’s
“The attention is good,” Teddy said. “It’ll help get us emergency funding from Congress. Maurice, how’s the booster?”
“It’s all right for now,” said Maurice Stein, Director of Pad Operations. “But it’s not ideal. EagleEye 3 was set to launch. Boosters aren’t designed to stand upright and bear the stress of gravity for long periods. We’re adding external supports that we’ll remove before launch. It’s easier than disassembly. Also the fuel is corrosive to the internal tanks, so we had to drain it. In the mean time, we’re performing inspections on all systems every three days.”
“Good, good,” Teddy nodded. “Now for the big question: Bruce? How’s Iris coming along?”
“We’re behind,” Bruce said with a tired shake of his head. “We’re going as fast as we can, but it’s just not fast enough.”
“I can find money for overtime,” Teddy offered.
“We’re already working around the clock.”
“How far behind are we walking about?” Teddy asked.
“We’ve been at it 29 days; so we only have 19 left,” Bruce explained. “After that, the Pad needs 13 days to mount it on the booster. We’re at least two weeks behind.”
“Is that as far behind as you’re going to get?” Teddy asked. “Or will you slip more?”
Bruce shrugged. “If we don’t have any more problems, it’ll be two weeks late. But we always have problems.”
“Give me a number,” Teddy said.
“15 days,” Bruce responded. “If I had another 15 days, I’m sure we could get it done in time.”
“All right,” Teddy said. “Let’s create 15 days.”
Turning his attention to the Ares-3 Flight Surgeon, Teddy asked “Dr. Keller, can we reduce Watney’s food intake to make the rations last longer?”
“Sorry, but no,” Keller said. “he’s already at a minimal calorie count. In fact, considering the amount of physical labor he does, he’s eating far less than he should. And it’s only going to get worse. Soon his entire diet will be potatoes and vitamin supplements. He’s been saving protein-rich rations for later use, but he’ll still be malnourished.”
“Once he runs out of food, how long until he starves to death?” Teddy asked.
“Presuming an ample water supply, he might last three weeks. Shorter than a typical hunger strike but remember he’ll be malnourished and thin to begin with.”
“Remember,” Venkat interjected, “Iris is a tumbler; he might have to drive a few days to get it. And I’m guessing it’s hard to control a rover when you’re literally starving to death.”
“He’s right,” Dr. Keller confirmed. “Within 4 days of running out of food, he’ll barely be able to stand up, let alone control a rover. Plus, his mental faculties will rapidly decline. He’d have a hard time even staying awake.”
“So the landing date’s firm,” Teddy said. “Maurice, can you get it on the booster in less than 13 days?”
Maurice pondered. “Well… It only takes 3 days to actually mount it. The following 10 are for testing and inspections.”
“How much can you reduce those?”
“With enough overtime, I could get the mounting down to 2 days. That includes transport from Pasadena to Cape Canaveral. But the inspections can’t be shortened. They’re time-based. We do checks and re-checks with set intervals between them to see if something deforms or warps. If you shorten the intervals, you invalidate the inspections.”
“How often do those inspections reveal a problem?” Teddy asked.
A silence fell over the room.
“Uh,” Maurice stammered. “Are you suggesting we don’t do the inspections?”
“No,” said Teddy. “Right now I’m asking how often they reveal a problem.”
“About one in twenty launches.”
“And how often is the problem they reveal a would-be mission-failure?”
“I’m, uh, not sure. Maybe half the time?”
“So if we skip the inspections and testing, we have a 1 in 40 chance of mission failure?” Teddy asked.
“That’s 2.5%,” Venkat said, steeping in. “Normally, that’s grounds for a countdown halt. We can’t take a chance like that.”
“
He looked around the table. Blank faces stared back.
“All right, then. Speeding up the mounting process and skipping inspections buys us 11 days. If Bruce can pull a rabbit out of a hat and get done sooner, Maurice can do some inspections.”
“What about the other 4 days?” Venkat asked, still frowning at skipping inspections.
“I’m sure Watney can stretch the food to last 4 extra days, malnutrition notwithstanding,” Teddy said, looking to Dr. Keller.
“I-” Keller started. “I can’t recommend-”
“Folks,” Teddy interrupted. “I understand your positions. We have procedures. Skipping those procedures means risk. Risk means trouble for your department. But now isn’t the time to cover our asses. We have to take risks or Mark Watney dies.”
