The aluminum block dominates the corner of the lab, a gleaming monolith caged in scaffolding, waiting for the inferno that will one day liquify its core. Evelyn stands before it, sketching feverishly on a battered whiteboard—arcs of heat flow, efficiency equations, the stylized sine-wave of a Stirling cycle. Ben paces behind her, brow furrowed. The weight of the idea—its ambition, its lunacy—settles on his shoulders anew with each pass.
Aris sets his coffee down with deliberate care. "To quantify the possibility," he murmurs, "we must first translate rocket exhaust into thermal uptake. The transfer mechanism—how do you propose to capture enough heat without vaporizing the containment vessel, let alone your own eyebrows?"
Evelyn grins, undaunted. "Ceramic-lattice heat exchangers, rated for above two thousand Celsius. We route the exhaust through baffles along the aluminum’s surface. The rapid heating melts the perimeter, and we circulate the molten metal inward to maintain a stable gradient. The bulk remains solid—serves as both heat sink and structural baffle."
Ben stops pacing. "If the exchangers crack, we lose everything. Thermal shock, molten aluminum, and then—"
"—a catastrophic mess," Aris finishes quietly. "But if it works, the captured heat is immense. Even a fraction, stored efficiently, could yield megawatt-hours through the Stirling engine. Could it be enough to offset costs?"
Evelyn looks up from her equations. For a beat, silence reigns—broken only by the hum of fume hoods and the distant thump of propulsion tests from the yard outside.
She speaks at last, voice steady. "That’s what we’re here to find out. Our first step: run a scaled simulation. We build a small-scale block, subject it to controlled heating—measure the yield, the losses. If the numbers hold, then we talk about rocket exhaust."
Aris nods, his eyes bright with speculative fire. Ben, though skeptical, feels the first tremor of belief. The lab, dusty and cluttered, becomes a crucible. The fate of the project—of the whole audacious idea—will hinge on this first test.
Evelyn snaps the cap on her marker, tossing it into a mug overflowing with spent pens. She crosses to the aluminum block, hand resting on its cool flank. "It's not just numbers on a board anymore," she says, almost to herself. "We've got to turn this into heat, and hope we don't melt more than the metal."
Suddenly, the overhead speaker crackles. "Lab three, this is Control. Your test window is in twenty minutes. Confirm readiness, or forfeit slot."
Ben turns to Aris, heartbeat drumming in his ears. The first real test, so soon—and everything they've worked for poised on the edge of success or failure.
A warning light flickers on the main console; there’s a faint hiss from the containment chamber. Something in the block’s outer thermocouple array is reading above expected baseline—an anomaly, right before the biggest test of their careers.