Given a temperature of 85 °F, pressure altitude of 6,000 ft, weight of 2,800 lb, and headwind of 14 kts, what is the approximate ground roll?

To determine the ground roll distance during takeoff, several factors need to be considered, including runway length, aircraft weight, temperature, pressure altitude, and wind conditions.

In this scenario, the temperature is 85 °F, which is somewhat higher than the standard temperature at sea level, leading to reduced air density. At a pressure altitude of 6,000 feet, the density is further lower, resulting in a decrease in engine performance and lift. The aircraft's weight is 2,800 lb, and it faces a headwind of 14 knots, which will help reduce the ground roll as it contributes to the aircraft's effective airspeed.

When calculating the ground roll, we generally expect an increase in distance required to takeoff under heavier weight and higher temperatures at elevation. The headwind reduces this requirement because it effectively increases the relative speed of the aircraft over the runway.

The calculated ground roll reflects a reasonable performance estimate given all these conditions. The choice of approximately 742 feet is a more typical ground roll distance for light aircraft under similar conditions, as the headwind assists in reducing the required roll distance. This value is within expected ranges, aligning with how temperature and elevation can impact aircraft performance in takeoff scenarios.

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