Overpressure valves: Stall or loose the torque?

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The Pratt and Whitney PT6-42 engine makes 850 hp at sea level, and it just keeps dishing out that huge torque even at high altitude where the air thins. How does it keep dishing out all that torque even in thin air? Simple: They built the compressor with such a huge pressure differential across the blades that they can ONLY… Read more »