There was little time to ponder such matters now.
The lift that the Airlander was about to attempt – that of a Ju 390 packed full of cargo – would be accomplished by a combination of factors. One, aerostatic force – due to the simple fact that the airship’s helium-filled hull was lighter than air.
Two, thrust – the use of the airship’s four huge propulsors, each powered by a 2,350-horsepower gas turbine driving a giant set of propellers. That alone was akin to having four heavy-lift helicopters roped to the corners of the warplane, giving their all.
And three, aerodynamic lift – provided by the Airlander’s laminated fabric hull. It was shaped like a cross section of a conventional aircraft wing, with a flatter underside and a curved upper. That shape alone would provide forty per cent of the lift, but only once the Airlander got moving in a forwards direction.
For the first few hundred feet, she’d be lifting vertically – during which time it was all up to the helium gas and the propulsors.
Jaeger heard the noise from the Airlander shift from a barely audible purr to a hollow roar, as she prepared for the lift. Right now, the four massive sets of rotor blades were set in the horizontal position, to provide maximum vertical thrust as the Airlander went about dragging the warplane free.
The downdraught increased to approaching storm force, blowing a blinding whirlwind of broken branches all around the warplane. It felt to Jaeger as though he was standing behind a monster combine harvester while the machine chewed its way through a field of giant wheat, spitting out the unwanted chaff into his face.
He slammed his side window closed, and gestured for Dale to do likewise, as blasts of rotten wood blew inside. Arguably, they were approaching the single most risk-laden moment of the whole crazy enterprise.
The Ju 390’s standard loaded weight was 53,000 kilos. With a 60,000-kilogram lift capacity, the Airlander should be able to manage the carry – as long as Hans Kammler and his cronies hadn’t overloaded the warplane.
Jaeger had every confidence in the strength of the slings looped beneath the Ju 390’s wings. He had similar confidence in the Airlander’s pilot, Steve McBride. It was whether they’d break free from the dead wood that was the million-dollar question. That, and the trust they were placing in German aeronautical engineering standing up to seven decades of rot and corrosion in the heart of the jungle.
Any error on either count could prove catastrophic. The Ju 390 – and maybe the Airlander with her – would plummet like a stone into the jungle.
Overnight, Jaeger and his team had felled some of the largest trees, using shaped ring-charges of plastic explosives slung around their trunks to blast them down. But they’d been limited both by time and the number of charges they had to hand. As much as fifty per cent of the canopy of dead wood remained intact.
They’d blasted down the largest and least decayed tree trunks – those most likely to put up greatest resistance. They were banking on the fact that the surviving dead wood was rotten, and would break apart as the Airlander dragged the warplane free.
The roar of the propulsors rose to an ear-splitting howl, the downdraught approaching hurricane force. Jaeger could tell that the Airlander was nearing its maximum thrust. He sensed something falling from above, as a dark linear shadow slashed across the cockpit.
A massive tree limb smashed into the apex of the Ju 390’s windscreen, where the front window panels met. The vertical steel strut linking the panels buckled under the blow, the thick Perspex warping under the crushing impact. As the branch broke in two and fell away, a jagged fault line streaked across the windscreen like a burst of forked lightning.
But, for now at least, the windshield had held.
Jaeger’s head was filled with a tidal wave of sound. Heavy, wind-blasted debris rained down on the Ju 390’s metal skin. He felt as if he were strapped inside a giant steel drum.
A long humming vibration rippled through the fuselage, as the turbulence from the propulsors set up some kind of resonance with the thick lifting straps wrapped around the plane. Jaeger could sense that every fibre of the airship was straining to make the lift, and that the aircraft herself was somehow fighting to be free.
Suddenly there was a violent lurch as the cockpit seemed to plunge towards the ground and the Ju 390’s tail wheel flipped up and broke free. The rear of the fuselage rose, throwing off whatever fallen debris and tree limbs still lay across her.
Four double wheels – eight colossal tyres – held the warplane to the ground now. The massive aircraft seemed to twist and shake, as if she were a monstrous bird trying to drag her claws free of a cloying swamp and take to the skies.
Moments later, there was a sound like a giant Velcro strip being ripped apart, and the Ju 390 lurched into the air.
The force of her breaking free thrust Jaeger downwards into his seat, and threw him forward against the restraining straps. For several seconds the giant warplane rose into the air as if the force of gravity had suddenly been suspended, moving steadily closer to the jagged crown of the skeletal canopy.
With the dead wood casting a cobweb of shadows across the cockpit, the warplane’s upper fuselage ploughed into the lowest branches. There was a tearing crash, the sudden impact throwing Jaeger off his seat, the straps of his harness ripping into his shoulders.
All around him, bony tree limbs clutched at the cockpit, as if a giant hand was trying to break its way in and pluck Jaeger, Dale and Narov out and hurl them to the ground. As the warplane tore a path upwards, an extra thick finger of wood punched through the Perspex side window, half knocking Dale’s camera from his grasp and spearing towards Jaeger on the far side.
He ducked, the jagged branch jabbing into his seat where his head had been moments earlier. The impact snapped it in two, leaving the broken limb hanging out of the warplane’s window.
Jaeger sensed the upward momentum of the aircraft slowing. He chanced a momentary glance to his left. He could see the giant propellers on the Ju 390’s port wing – each twice the height of a fully grown man – ensnared in the branches. Moments later, the grasp of the skeleton canopy tightened around the aircraft and she came to a juddering halt.
They were suspended ninety feet above the ground, and stuck fast.
78
For several seconds the Ju 390 seemed to hang there in her nest of wooden bones.
From above, Jaeger heard the howl of the propulsors changing pitch, the downdraught dropping off to a faint breeze. For an instant he feared the pilot was giving up; that he’d been forced to admit that the dead wood had defeated him – in which case Jaeger, Narov and Dale would be facing a sixty-strong enemy force pretty damn quickly.
He risked flicking on his Thuraya, and instantly there was a data-burst message from Raff.
Pilot will reverse to make a forward run, using hull’s lift to break you free. STAND BY.
Jaeger flicked the satphone off again.
The Airlander’s hull provided almost half of her lift: by reversing and taking a run-up she could double her pulling power.
Jaeger shouted a warning to Narov and Dale to hold on tight for the ride. No sooner had he done so than there was an abrupt change in the direction of the force being exerted on the Ju 390, as the airship accelerated into forward motion at full power.
The cutting edges of the Ju 390’s wings were driven into the dead wood, the sharp nose cone drilling forward. Jaeger and Dale ducked below the flight panel as the cockpit speared its way through a tangled wall of tree limbs bleached white by the tropical sun.