"Khoroshau." Andrei Petrovich Androv nodded absently, still engaged in his thoughts. "Dobriy utro."
"Today I have more good news," Ikeda continued as he headed for the coffee urn. "My 0730 briefing included a report that during the night our Tsukuba team completed a simulation of the aerodynamic performance of your suggested modification all the way to Mach 25. Just as you envisioned, leading-edge deformation and vortex bursts were reduced to values well within the acceptable envelope." He looked back. "Which makes me question whether we really need to proceed with this morning's run."
"Your SX-10 only tells us how a fuselage performs if airflows are ideal," Androv replied. "At hypersonic temperatures and velocities air doesn't behave predictably, like a perfect gas. Fluid dynamics models can only give us approximations of actual characteristics." He glanced up from the video control panel, his face determined. "It is my son, Yuri, who will be in the cockpit of these vehicles, and my experience is you never put your faith in simulations. In the hypersonic regime, computer simulations are just guesswork, a shortcut not worth a drozhky driver's fart."
"As you wish," Ikeda replied evenly, taking his first sip of coffee.
In truth, Andrei Androv did not dismiss simulations out of hand. He knew their Fujitsu supercomputer was truly a marvel, capable of replicating the aerodynamic characteristics of a given fuselage component, modifying it, testing it, over and over millions of times, iterating to the optimum design in almost the twinkling of an eye.
In every respect the high technology available here was astonishing. Take their hypersonic wind tunnel. Its laser probes shone thin slices of coherent light through the swirling air currents, revealing complexities otherwise hidden amid whorls of turbulence. These data were then enhanced through holography, which used the laser light to create colored 3-D representations of the flow around the model. Finally those holograms were fed into the supercomputer and analyzed from all angles.
This project would have been impossible anywhere else on earth. But here, the foreign team had created a feather-light hypersonic airframe that used turbo-ramjets for horizontal takeoff and then changed their geometry into fuel-injected supersonic combustion ramjets, or scramjets, which combusted fuel and atmospheric oxygen using an internal shock wave instead of conventional compressors to achieve orbital velocity, Mach 25. It was his dream come true.
"Brief me again on the simulation." Androv turned back to Ikeda. "You say you went all the way to our maximum design objective?"
"We ran through the entire flight profile in real time," the other man replied. "There were no stability problems whatsoever. Either during the power-up or during the switch-over to scramjet engine geometry at Mach 4.8."
"Encouraging, encouraging." Androv turned back to his video panel as the fans continued to accelerate. The violins of the A Minor quartet, his favorite of all Beethoven's late works, washed over the room. "All the same, we must run a complete sequence here for any design alterations."