Rotor Quotes

Jason turned to Leo. “Do you think you can fly this thing?” “Um…” Leo put his hand on the side of the helicopter, concentrating hard, as if listening to the machine. “Bell 412HP utility helicopter,” Leo said. “Composite four-blade main rotor, cruising speed twenty-two knots, service ceiling twenty-thousand feet. The tank is near full. Sure, I can fly it.” Piper smiled at the ranger again. “You din’t have a problem with an under-aged unlicensed kid borrowing your copter, do you? We’ll return it.” “I-“ The pilot nearly choked on the words, but she got them out: “I don’t have a problem with that.” Leo grinned. “Hop in kids, Uncle Leo’s gonna take you for a ride.

There’s no time,’ the German shouted over the rotor noise. ‘Get inside.’ He and the Dutchman opened fire on the approaching vehicles. Driver re-entered the house, slamming both security doors shut behind her.

winds. is. The giant rotors whip salt spray

I would rather fly on a Pekin duck than in a helicopter. The safest place for a rotor aircraft is on a page in da Vinci's diary.

Against the distant roar of the maelstrom I heard it. The hurrying strop of rotor blades on the fabric of the night.

The concrete can’t stop the separation of rotor from plane, the separation of father from daughter. There are crashes and then the walking away, the bleeding, and the shaky ride back.

On a training mission, he’d watched as Nightstalker pilots cut their own landing zone using the rotors of the helicopter as giant hedge clippers. They’d been landing in a pine forest and he marveled as the helo dropped into the hole of its own making—pine

A break came when Polish intelligence officers created a machine based on a captured German coder that was able to crack some of the Enigma codes. By the time the Poles showed the British their machine, however, it had been rendered ineffective because the Germans had added two more rotors and two more plugboard connections to their Enigma machines.

IT WAS A HOT AND MUGGY DAY AS I looked up in the powder blue sky that covered the Port of San Pedro. The Bell helicopter circled above like a dragonfly in my Grandma Cholé's rose garden. I don't know if it was the unbearable humidity or the whoop- whoop- whoop of the chopper's rotor blades as they sliced through the air, but something was affecting me.

As the helicopter fell, its dead rotors started to spin, and Ruvola used that energy to slow the aircraft down. Like downshifting a car on a hill, a hovering auto-rotation is a way of dissipating the force of gravity by feeding it back through the engine. By the time the helicopter hit the water it had slowed to a manageable speed, and all the torque had been bled out of the rotors;

The engineer raised the litter, and we used the tagline to prevent the rotor wash from twirling it like a top. The litter reached the helicopter door and the engineer dragged it into the chopper. Noxious fluids leaked from the body bag, blown into sticky mist by the rotors. Sickened by the powerful smell, the flight engineer leaned out the door and vomited a stream into the downwash.

There were early mornings–“zero dark thirty,” as they were called–when a special operations helicopter would appear, 300 feet from his quarters. These were UH-60 Blackhawks, which staged on the taxiway far from the rest of the camp. The crews waited in the middle of the night, engines and rotors engaged, until they were called in for a raid as part of a task force so secretive that even its designation was classified.

It was long, with a wide body up front that tapered as it moved back. Multiple rotors sat on top of it, spinning so quickly they were only visible as a solid circle above it. More were situated along short wings on the tail at the back, and on a second pair of slightly larger wings closer to the front. An open hatch was spilling light on the port side, and Hayden could make out narrow lines running from it to the rooftop.

The first responders casually walk towards the helicopter, perhaps thinking this is merely a training exercise. Sergeant Funches leaps from the aircraft covered in blood, frantically waving his arms like a madman. The responders belatedly realize this is a real emergency and begin sprinting to the helicopter. Funches barely has time to stop an overzealous fireman running towards the rear of the helicopter. The fireman holds a litter vertically in the air and nearly runs into the spinning tail rotor.

One member of Paley's preschool class is 'The Boy Who Would Be a Helicopter.' He is probably vaguely autistic, high-functioning, yet solitary to a degree considered irregular. His playmates invite him into their games (which are ongoing, morphing narratives), but he stubbornly resists. He loves his helicopter. He would like to be a helicopter himself so that he could fly with his friend, the machine, and have adventures. Machine adventures. Rescue missions, yet with rotors, so that, perhaps, there wouldn't be hugging involved. (Antonya Nelson)

Panning his sunglasses across Quincy, Jamie, and LB, he spun his finger in small circles. He spoke into the mike curled at his lips. “Spinning up now.” Quincy climbed to his feet. He offered a mitt down to Jamie to lift him, then to LB. Across the pad, through waves of heat off the concrete, the rotors of Pedro 1 accelerated also. Quincy and Jamie hurried away with their packs and carbines. Jamie’s gait showed the strain; Quincy dug a big paw under the boy’s pack to help him along. LB donned his helmet and shouldered his rifle. Wally stayed seated, on the radio recalling Doc from the hospital.

This is it. October 2, 2020, and the whole world watched, and history remembered. Alex waits on the South Lawn, within view of the linden trees of the Kennedy garden, where they first kissed. Marine One touches down in a cacophony of noise and wind and rotors, and Henry emerges in head-to-toe Burberry looking dramatic and windswept, like a dashing hero here to rip bodices and mend war-torn countries, and Alex has to laugh. "What?" henry shouts over the noise when he sees the look on Alex's face. "My life is cosmic joke and you're not a real person," Alex says, wheezing. "What?" Henry yells again. "I said, you look great, baby!

The helicopter was equipped with no bombsights or targeting mechanisms that could help them here. To drop the sandbags into the reactor vault, the flight engineer had to aim as best he could by eye, estimate a trajectory, and shove them through the door one at a time. As he leaned out over the reactor, he was enveloped in clouds of toxic gas and blasted by waves of gamma and neutron radiation. He had no protection apart from his flight suit. The intense heat rising from below made it impossible for Nesterov to hover: if the helicopter lost forward momentum, it would be caught in the column of superheated air, its rotor blades would encounter a calamitous drop in torque, and the machine would fall abruptly out of the sky.

The more serious about gardening I became, the more dubious lawns seemed. The problem for me was not, as it was for my father, the relation to my neighbors that a lawn implied; it was the lawn’s relationship to nature. For however democratic a lawn may be with respect to one’s neighbors, with respect to nature it is authoritarian. Under the mower’s brutal indiscriminate rotor, the landscape is subdued, homogenized, dominated utterly. I became convinced that lawn care had about as much to do with gardening as floor waxing, or road paving. Gardening was a subtle process of give and take with the landscape, a search for some middle ground between culture and nature. A lawn was nature under culture’s boot. Mowing the lawn, I felt like I was battling the earth rather than working it; each week it sent forth a green army and each week I beat it back with my infernal machine. Unlike every other plant in my garden, the grasses were anonymous, massified, deprived of any change or development whatsoever, not to mention any semblance of self-determination. I ruled a totalitarian landscape. Hot monotonous hours behind the mower gave rise to existential speculations. I spent part of one afternoon trying to decide who, in the absurdist drama of lawn mowing, was Sisyphus. Me? A case could certainly be made. Or was it the grass, pushing up through the soil every week, one layer of cells at a time, only to be cut down and then, perversely, encouraged (with fertilizer, lime, etc.) to start the whole doomed process over again? Another day it occurred to me that time as we know it doesn’t exist in the lawn, since grass never dies or is allowed to flower and set seed. Lawns are nature purged of sex and death. No wonder Americans like them so much.

In a matter of sixty short minutes, that thing could whisk Neil away to civilization, I thought. Hmm. My goodness, that was a beautiful prospect. Somehow I had to get on that chopper with him. I packed in thirty seconds flat, everything from the past three months. I taped a white cross onto my sleeve, and raced out to where Neil was sat waiting. One chance. What the heck. Neil shook his head at me, smiling. “God, you push it, Bear, don’t you?” he shouted over the noise of the rotors. “You’re going to need a decent medic on the flight,” I replied, with a smile. “And I’m your man.” (There was at least some element of truth in this: I was a medic and I was his buddy--and yes, he did need help. But essentially I was trying to pull a bit of a fast one.) The pilot shouted that two people would be too heavy. “I have to accompany him at all times,” I shouted back over the engine noise. “His feet might fall off at any moment,” I added quietly. The pilot looked back at me, then at the white cross on my sleeve. He agreed to drop Neil somewhere down at a lower altitude, and then come back for me. “Perfect. Go. I’ll be here.” I shook his hand firmly. Let’s just get this done before anyone thinks too much about it, I mumbled to myself. And with that the pilot took off and disappeared from view. Mick and Henry were laughing. “If you pull this one off, Bear, I will eat my socks. You just love to push it, don’t you?” Mick said, smiling. “Yep, good try, but you aren’t going to see him again, I guarantee you,” Henry added. Thanks to the pilot’s big balls, he was wrong. The heli returned empty, I leapt aboard, and with the rotors whirring at full power to get some grip in the thin air, the bird slowly lifted into the air. The stall warning light kept buzzing away as we fought against gravity, but then the nose dipped and soon we were skimming over the rocks, away from base camp and down the glacier. I was out of there--and Mick was busy taking his socks off.

Despite international calls for Chernobyl to be decommissioned at once, it endured a very gradual demise. On October 11th, 1991, just five years after the Unit 4 explosion, there was a third major accident at the plant, this time at Unit 2. Prior to the event, the Unit had been taken offline following another accident - this time a fire in its section of the turbine hall, which had broken out during minor turbogenerator repair work. After extinguishing the blaze, the generator had been isolated and its turbine coasted down to about 150 rpm when a faulty breaker switch closed, reconnecting it to the grid. The turbine rapidly sped up to 3000 rpm in under 30 seconds, then, according to a 1993 report by the U.S. Nuclear Regulatory Commission, “the influx of current to TG-4 overheated the conductor elements and caused a rapid degradation of the mechanical end joints of the rotor and excitation windings. A centrifugal imbalance developed and damaged generator bearings 10 through 14 and the seal oil system, allowing hydrogen gas and seal oil to leak from the generator enclosure. Electrical arcing and frictional heat ignited the leaking hydrogen and seal oil creating hydrogen flames 8 meters high, and dense smoke which obstructed the visibility of plant personnel. When the burning oil reached the busbar of the generator it caused a three-phase 120,000-amp short circuit.”265

In a matter of sixty short minutes, that thing could whisk Neil away to civilization, I thought. Hmm. My goodness, that was a beautiful prospect. Somehow I had to get on that chopper with him. I packed in thirty seconds flat, everything from the past three months. I taped a white cross onto my sleeve, and raced out to where Neil was sat waiting. One chance. What the heck. Neil shook his head at me, smiling. “God, you push it, Bear, don’t you?” he shouted over the noise of the rotors. “You’re going to need a decent medic on the flight,” I replied, with a smile. “And I’m your man.” (There was at least some element of truth in this: I was a medic and I was his buddy--and yes, he did need help. But essentially I was trying to pull a bit of a fast one.) The pilot shouted that two people would be too heavy. “I have to accompany him at all times,” I shouted back over the engine noise. “His feet might fall off at any moment,” I added quietly. The pilot looked back at me, then at the white cross on my sleeve. He agreed to drop Neil somewhere down at a lower altitude, and then come back for me. “Perfect. Go. I’ll be here.” I shook his hand firmly. Let’s just get this done before anyone thinks too much about it, I mumbled to myself. And with that the pilot took off and disappeared from view. Mick and Henry were laughing. “If you pull this one off, Bear, I will eat my socks. You just love to push it, don’t you?” Mick said, smiling. “Yep, good try, but you aren’t going to see him again, I guarantee you,” Henry added. Thanks to the pilot’s big balls, he was wrong. The heli returned empty, I leapt aboard, and with the rotors whirring at full power to get some grip in the thin air, the bird slowly lifted into the air. The stall warning light kept buzzing away as we fought against gravity, but then the nose dipped and soon we were skimming over the rocks, away from base camp and down the glacier. I was out of there--and Mick was busy taking his socks off. As we descended, I spotted, far beneath us, this lone figure sat on a rock in the middle of a giant boulder field. Neil’s two white “beacons” shining bright. I love it. I smiled. We picked Neil up, and in an instant we were flying together through the huge Himalayan valleys like an eagle freed. Neil and I sat back in the helicopter, faces pressed against the glass, and watched our life for the past three months become a shimmer in the distance. The great mountain faded into a haze, hidden from sight. I leaned against Neil’s shoulder and closed my eyes. Everest was gone.

What made it harder to stomach was the fact that the pilot of the helicopter with the television cameras was particularly keen to do his job to the best of his ability by coming as close as he could to get pictures of me, even though he was almost mowing the number off my back with his rotor-blades. Obviously, the turbulence he caused pushed enough wind at me to slow me down a fair bit. Two or three times I came close to crashing and shook my fist at him. Guimard was beside himself with rage. So was I. In normal circumstances, if all the stages had been run off in the usual way, or even with the bare minimum of morality, the time trial would only have been of secondary importance because the race would have been decided well before. And I would have won my first Giro d’Italia in the most logical way possible. Instead of which my chest burned with pain: the pain you feel at injustice.

dirty. Would he end up like Luke if he stayed in the Teams long enough? Only to wake up one day and not recognize the man staring back at him in the mirror? The thump of the inbound helo’s rotors saved him

Surprising how many people assumed that when a helicopter failed it simply rotored on down. Truth was, it fell with the aerodynamics of a grand piano.

Nagler-Rolz helicopter (unspecified type) Two types of ultra-light helicopter were designed by Bruno Nagler. Each of these could be strapped to a man’s back. The first, for which no designation has been reported, has a single rotor, and a small engine enclosed in a fairing is mounted on an extension of the rotor on the opposite side of the hub. The motor drives a shaft which is housed inside the blade and, in turn, through bevel gearing, drives two small propellers in opposite directions. The propellers are located at the centre of pressure, one at the leading-edge and one at the trailing-edge of the blade.     Nagler-Rolz NR

The Squeaky Wheel The squeaky wheel ~ will put you $374.43 in the hole after replacing the brake pad, rotors and $500 with a new master cylinder.

Yet Enigma was a huge challenge. It looked like a typewriter, but with no space for paper. It had lights for each letter and, inside it, the three rotors (and later more than three) could be arranged in a range of different ways, each one linked to a different set of electrical connections. The key code, with the rotor setting, would be in a three letter key for each day, which all the machine operators would look up in the code book. It was believed to be impregnable. The three rotors could mean more than 17,000 different solutions for a given message, but – since the three rotors could be rearranged in any of six different ways – the number of combinations reached over 105,000.

Because the chance to kill the owner of that dog tag is the only reason he agreed to this mission. And he would sooner throw himself out the access hatch, onto the engine rotors, than miss it. But

Huey the helicopter Huey was testing the “Jesus nut” on his Huey chopper—the nut that holds the rotor on or else one meets Jesus—when outside his hanger there came a thundering roar as only Blackhawk helicopters make.

We stood near the doorway, wedged between the blazing mouth of the electric crematorium and the March heat. The only breeze came from Stella’s son, who kept spinning the red rotors of a toy helicopter.

Dark livid clouds swirled overhead like a wire scrubber caught in a rotor.

The Telharmonium was installed in New York City in 1906. It wasn’t a single, self-contained musical instrument, but a vast 200-ton complex of equipment the size of a power plant. Each of its massive, electro-mechanical rotors—giant tone wheels—spun around to generate a sine wave (the basic building block of sound), along with other sine waves above it of a higher frequency. The idea was to simulate the physics that determine the distinct tone colors of different acoustic instruments, each note of these instruments being a fundamental sine wave tone, with overtones on top of it that give it its special character. Stacking up sine waves to build sounds of distinct timbres is the principle of “additive synthesis,” and Cahill, in his patent, anticipated the term “synthesizer” when he explained that, out of these “elemental electrical vibrations

A player sitting at the Telharmonium’s master console with its touch-sensitive keyboards could trigger the device’s network of whirling rotors, generating electrical currents that corresponded to the notes being played. The currents were sent through telephone wires to “broadcast” the music to hotels, restaurants, and private homes as a subscription service. The sound quality was limited because amplification and electrically driven dynamic loudspeakers hadn’t been invented yet. The Telharmonium’s music was piped through what were essentially telephone receivers acoustically boosted with large megaphone horns—some as long as six feet—or channeled through carbon arc lamps that could oscillate with the electronic signal.

Ma’am,” Piper said with her best smile. “You don’t mind helping us one more time, do you?” “I don’t mind,” the pilot agreed. “We can’t take a mortal into battle,” Jason said. “It’s too dangerous.” He turned to Leo. “Do you think you could fly this thing?” “Um…” Leo’s expression didn’t exactly reassure Piper. But then he put his hand on the side of the helicopter, concentrating hard, as if listening to the machine. “Bell 412HP utility helicopter,” Leo said. “Composite four-blade main rotor, cruising speed twenty-two knots, service ceiling twenty-thousand feet. The tank is near full. Sure, I can fly it.” Piper smiled at the ranger again. “You don’t have a problem with an under-aged unlicensed kid borrowing your copter, do you? We’ll return it.” “I—” The pilot nearly choked on the words, but she got them out: “I don’t have a problem with that.” Leo grinned. “Hop in, kids. Uncle Leo’s gonna take you for a ride.

NORMA FOERDERER, TRUMP’S LONGTIME aide, rushed into the boss’s office on the twenty-sixth floor of Trump Tower. The helicopter that carried the three executives had gone down. Agonizing minutes went by. Then a New Jersey police official called with the news: no survivors. Three of Trump’s most trusted aides, including the ones most responsible for opening the Taj, had perished, along with the crew of two. Trump would later learn that the scrape on one of the rotor blades had expanded during the flight, the result of metal fatigue. Over the pinelands of New Jersey, at an altitude of twenty-two hundred feet, a portion of the blade broke, the helicopter’s aerodynamics went askew, and the aircraft split apart in midair, raining wreckage on the Garden State Parkway. Trump

The night was bad. The sounds began their assault when Maya was in that gentle cusp between consciousness and sleep. The clamoring, the screams, the rotors, and the gunfire were relentless. They would not pause. They would not let up. They grew louder and stayed. Maya wasn’t in her bed. She wasn’t back there either. She was in this in-between world, suspended, lost. All was darkness and noise, unceasing, endless noise, the type of noise that seemed to come from within her, as though some small creature had climbed inside her head and started screeching and scratching from within. There was no escape, no rational thought. There was no here or now, no yesterday or tomorrow. That would all come later. Right now there was nothing but the agony of the sounds shredding through her brain like a reaper’s scythe. Maya put her hands on either side of her head and pushed hard as though trying to crush her own skull. It

I had long found out that being happy here (in Papua) was rater a matter of attitude than of circumstances, training, or suitability.

Helicopters Nothing has done more to change the face of wilderness rescue than helicopters. They land in remote areas that were inaccessible to aircraft only a few years ago. If the spot isn’t flat enough, helicopters have been known to land on one skid while a patient is quickly loaded. When there is no spot to land, they have hovered with a rescuer hanging from a rope or cable, a rescuer equipped to attach the patient to the hauling system for evacuation. Helicopters go where the pilot wants because of the rapid spinning of two sets of blades. The large overhead blades create air by forcing air down. The pilot can vary the angle at which the blades attack the air and the speed at which they rotate to vary the amount of lift. The entire rotor can be tilted forward, backward, or sideways to determine the direction of travel. Without a second set of blades spinning in an opposite direction, the helicopter would turn circles helplessly in the air. Some large helicopters have two large sets of blades spinning in opposite directions, one fore and one aft, but most helicopters used in the wilderness maintain stability with one small tail rotor. When they are close to the ground, the spinning blades build a cushion of air that helps support the helicopter. This cushion of air varies in its ability to work, depending on its density. Rising air temperatures and increasing altitude reduce air density. So trying to land a helicopter on a mountaintop on a hot day is dangerous, and the weight of one person may prevent liftoff. Air density also is altered by the nearness of a mountainside. The downward shove of air by the blades can recirculate off the mountainside and reduce lift. One of the greatest fears of mountain flying is a sudden downdraft of air that can slam a helicopter toward the ground. Downdrafts are not only dangerous but also unpredictable. Add to air density and downdrafts the possibility of darkness and fog and wind, and you can understand that even if a helicopter is available it may not be able to come to your rescue.

When you’re in need of a rescue the approaching thump-thump-thump of rapidly rotating blades is a joyous sound. To give the helicopter rescue the greatest chance of success, a suitable landing zone will have to be found. The ideal landing zone should not require a completely vertical landing or takeoff, both of which reduce the pilot’s control. The ground should slope away on all sides, allowing the helicopter to immediately drop into forward flight when it’s time to take off. Landings and liftoffs work best when the aircraft is pointed into the wind because that gives the machine the greatest lift. The area should be as large as possible, at least 60 feet across for most small rescue helicopters, and as clear as possible for obstructions such as trees and boulders. Clear away debris (pine needles, dust, leaves) that can be blown up by the wash of air, with the possibility of producing mechanical failure. Light snow can be especially dangerous if it fluffs up dramatically to blind the pilot. Wet snow sticks to the ground and adds dangerous weight. If you have the opportunity, pack snow flat well before the helicopter arrives—the night before would be ideal—to harden the surface of the landing zone. Tall grass can be a hazard because it disturbs the helicopter’s cushion of supporting air and hides obstacles such as rocks and tree stumps. To prepare a landing zone, clear out the area as much as possible, including removing your equipment and all the people except the one who is going to be signaling the pilot. Mark the landing zone with weighted bright clothing or gear during the day or with bright lights at night. In case of a night rescue, turn off the bright lights before the helicopter starts to land—they can blind the pilot. Use instead a low-intensity light to mark the perimeter of the landing area, such as chemical light sticks, or at least turn the light away from the helicopter’s direction. Indicate the wind’s direction by building a very small smoky fire, hanging brightly colored streamers, throwing up handfuls of light debris, or signaling with your arms pointed in the direction of the wind. The greatest danger to you occurs while you’re moving toward or away from the helicopter on the ground. Never approach the rear and never walk around the rear of a helicopter. The pilot can’t see you, and the rapidly spinning tail rotor is virtually invisible and soundless. In a sudden shift of the aircraft, you can be sliced to death. Don’t approach by walking downhill toward the helicopter, where the large overhead blade is closest to the ground. It is safest to come toward the helicopter from directly in front, where the pilot has a clear field of view, and only after the pilot or another of the aircraft’s personnel has signaled you to approach. Remove your hat or anything that can be sucked up into the rotors. Stay low because blades can sink closer to the ground as their speed diminishes. Make sure nothing is sticking up above your pack, such as an ice ax or ski pole. In most cases someone from the helicopter will come out to remind you of the important safety measures. One-skid landings or hovering while a rescue is attempted are solely at the discretion of the pilot. They are a high risk at best, and finding a landing zone and preparing it should always be given priority.

Neil’s feet were still numb from the frostbite. Long exposure up high, sat waiting in the snow for all those hours at the Balcony, had taken their toll. At base camp, we bandaged them up, kept them warm, and purposefully didn’t discuss the very real prospect of him losing his toes. He didn’t need to be told that he was unlikely ever to feel them again properly. Either way, we realized that the best option for them was to get him proper medical attention and soon. There was no way he was going to be walking anywhere with his feet bandaged up like two white balloons. We needed an air-evacuation. Not the easiest of things in the thin air of Everest’s base camp. The insurance company said that at dawn the next day they would attempt to get him out of there. Weather permitting. But at 17,450 feet we really were on the outer limits of where helicopters could fly. True to their word, at dawn we heard the distant rotors of a helicopter, far beneath us in the valley. A tiny speck against the vast rock walls on either side. In a matter of sixty short minutes, that thing could whisk Neil away to civilization, I thought. Hmm. My goodness, that was a beautiful prospect. Somehow I had to get on that chopper with him. I packed in thirty seconds flat, everything from the past three months. I taped a white cross onto my sleeve, and raced out to where Neil was sat waiting. One chance. What the heck. Neil shook his head at me, smiling. “God, you push it, Bear, don’t you?” he shouted over the noise of the rotors. “You’re going to need a decent medic on the flight,” I replied, with a smile. “And I’m your man.” (There was at least some element of truth in this: I was a medic and I was his buddy--and yes, he did need help. But essentially I was trying to pull a bit of a fast one.) The pilot shouted that two people would be too heavy. “I have to accompany him at all times,” I shouted back over the engine noise. “His feet might fall off at any moment,” I added quietly. The pilot looked back at me, then at the white cross on my sleeve. He agreed to drop Neil somewhere down at a lower altitude, and then come back for me. “Perfect. Go. I’ll be here.” I shook his hand firmly. Let’s just get this done before anyone thinks too much about it, I mumbled to myself.

From his bedroom window on the Marine Corps Base in Quantico, Nathaniel Dixon watched in awe at the four-ship formation of V-22 Ospreys chewing up the Virginia air with their massive, wingtip-mounted tilt rotors as they made a pass over the flight line. The aircraft grew in his window as they approached the small bungalow he lived in with his mother and father on base. Just before they flew out of sight, Nathaniel clapped his hands together over the window and imagined smashing each Osprey like a dragonfly. Then, he imagined each falling to earth in flames, smashing in a great ball of fire in his backyard.

The military implications are obvious, if difficult to act upon in today’s fiscal environment. There’s a clear and continuing need for Marines, for amphibious units and naval supply ships, for platforms that allow operations in littoral and riverine environments, and for capabilities that enable expeditionary logistics in urbanized coastal environments. Rotary-wing or tilt-rotor aircraft, and precise and discriminating weapons systems, will also be needed. There’s also a clear need to structure ground forces so that they can rapidly aggregate or disaggregate forces and fires, enabling them to operate in a distributed, small-unit mode while still being able to concentrate quickly to mass their effect against a major target. Combat engineers, construction engineers, civil affairs units, intelligence systems that can make sense of the clutter of urban areas, pre-conflict sensing systems such as geospatial tools that allow early warning of conflict and instability, and constabulary and coast guard capabilities are also likely to be important. The ability to operate for a long period in a city without drawing heavily on that city’s water, fuel, electricity, or food supply will be important as well, with very significant implications for expeditionary logistics. I go into detail on all these issues, and other military aspects of the problem, in the Appendix.

Generally speaking, helicopters produce a distinctive percussive chop-chop rotor sound caused by the positioning of the blades. Adjust the blade angle, increase the number of blades in the main and tail rotors from four to five or six, and the noise diminishes, blending into the background sounds. Moreover, these Sikorsky Black Hawks had been re-engineered and reimagined with swept stabilizers and a noise suppressing “dishpan” cover over the tail rotor. Further refinements included reducing the rpm, especially in forward flight below maximum speed. To the untrained ear, it appeared that the helicopters were much farther away, not heading in, but away from a target. There were also changes that reduced the chances of returning radar signals. Retractable landing gears and fairings over the rotor hubs cut down the radar cross-section (RCS). And sharp edges, standard on the UH-60s, were replaced with curved surfaces coated in a special silver-loaded infrared skin. These important

They looked like some kind of military rescue craft, but they didn't use rotors or jet engines and they didn't have any wings or lifting airframes. They just moved through the air as if gravity and wind resistance were no longer design concerns for aircraft engineers.

Fermi started to calculate on his own, saying nothing, and in a direct, simple way found the essential point. The ability of a centrifuge to separate U-235 from U-238 was proportional to its length and to the fourth power of the peripheral speed of its rotor. Karl

breezed past me towards the cockpit. “I’ll drive.” “Why you?” Wait, shut up, Penny. You’ve got a goose-egg on your forehead and your heart aches. You don’t want to drive! Fortunately, Claire had her answer ready. “Artificially enhanced super reflexes, I’ve been watching Remmy, and I play more flight simulators than you do.” Relieved to be relieved of duty, I sank down in a chair and closed my eyes. The ship lurched, pulling me down for a second, but that meant we were airborne. Or spaceborne. I only felt a gentle tug to one side as we accelerated. Claire was getting the hang of the system. I peeked enough to see the wall towards the back of the ship brighten. Evidence for my theory that Remmy used the push of aetheric rotors to disguise the pull of engine thrust. “Any guesses how I find Europa station?” Claire called out.

Phobie de l’avion?’ said the man in the next seat. Marc shook his head, raising his voice to be heard over the sound of the helicopter’s rotors. ‘No. It’s more like I have a professional sense of concern . . .’ Beneath them, cerulean-blue waters flashed past as the red-and-white EC130 followed the French coastline north toward the Ligurian Sea. The journey from the airport in Nice was a short one, but flying over the water was always enough to dredge up some of Marc’s more unpleasant memories. He had hoped it wouldn’t show on his face, but that clearly wasn’t the case. ‘I used to fly these things myself,’ he added, feeling compelled to explain away his reaction. ‘I don’t like it when someone else is the pilot.’ For a giddy second, he feared the sea was rising up to reach for them – it could be deceptive that way, easy to gauge your height wrongly if you weren’t paying attention – and he closed his eyes to banish the thought. It didn’t work. He remembered a stretch of ocean half a world away, and the heart-stopping impact of a Royal Navy Lynx’s canopy hitting the water. He took a deep breath before the recall could take hold and pull him under. ‘Backseat driver?’ Somewhere in his late fifties, deeply bronzed beneath a panama hat and an expensive safari suit, the man next to him studied Marc’s face. Marc gave a wry nod. ‘Yeah, you could say that.

We kept saying a turbine lasts twenty years. That was our vision.” Cashman laughs. “But none of our turbines lasted twenty years. As a matter of fact, Alcoa Aluminum had a huge Darrieus Rotor that they had made, just straight aluminum. They thought they were going to be the wind energy guys, you know, really big. It fell down the day before we had the annual American Wind Energy Association Conference at their headquarters. It was going to be the big symbol, and it fell down—it got resonant vibrations.

Time is on my side, already written there across the first helmet I ever wore there. And underneath it, in smaller letting that read more like a whispered prayer than an assertion, No lie, GI. The rear-hatch gunner on a Chinook threw it to me that first morning at the Kontum airstrip, a few hours after the Dak To fighting had ended, screaming at me through the rotor wind, "You keep that, we got plenty, good luck!" and then flying off. I was so glad to have the equipment that I didn't stop to think where it had to have come from. The sweatband inside was seasoned up black and greasy, it was more alive now than the man who'd worn it, when I got rid of it ten minutes later I didn't just leave it on the ground, I snuck away from it furtive and ashamed, afraid that someone would see it and call after me, "Hey numnuts, you forgot something...

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quadcopters were on the deck, their rotors spinning with a thunderous thump-thump-thumping. Navy SEALs rushed every which

Just talking about it made his leg hurt even worse. He smelled the gunpowder. The stench of blood and death. Heard the beat of helicopter rotors. The bark of Rubin's gun. So precise. So deadly. The pain of his shattered bone.

They did pull the distributor caps back off both of them, removing the rotor buttons again—redneck anti-theft practices in a post-apocalyptic world.

Peña appeared next to me, helped me to my feet, and led me off the copter. We were standing on some rooftop. With the sun up now, heat rippled off the tar, and the downdraft from the rotors felt like the blast from a convection oven