Multi-Engine Ground School Part 3: Performance and Limitations

When a pilot loses one engine in a light twin-engine aircraft, performance doesn't just drop by 50%—it plummets by 80 to 90% due to the loss of both raw power and the added drag from the unfeathered propeller. This shocking reality, rooted in excess horsepower calculations, means that even if you have 200 horsepower available for climb with both engines, losing one leaves you with only 20 horsepower—barely enough to maintain altitude. The podcast debunks the myth that light twins are inherently safe on a single engine, revealing that manufacturers aren’t required to guarantee any climb rate after an engine failure—only directional control. As a result, there’s no official 'accelerate go' chart in light twin POHs because the FAA doesn’t mandate performance guarantees. Instead, pilots must rely on judgment: if you're on the ground when an engine fails, you stop. If you're airborne, you continue. This stark truth reshapes how pilots approach takeoff decisions, especially at short or high-density-altitude fields. The episode also unpacks critical concepts like drift down, single-engine ceilings, and the dangerous illusion that multi-engine aircraft are safer in emergencies—when in reality, they can simply delay a crash, not prevent it.