What is the approximate flight time available at 18,000 ft with a temperature of -21 °C and a power setting of 2,400 RPM?

To determine the approximate flight time available at 18,000 feet with a temperature of -21 °C and a power setting of 2,400 RPM, it’s essential to understand the relationship between altitude, temperature, and engine performance.

At 18,000 feet, the air temperature is colder, which affects engine efficiency and performance metrics. The power setting of 2,400 RPM suggests that the engine is running at a standard cruise power level, typical for maintaining a consistent speed and altitude.

When considering endurance calculations, factors such as fuel consumption rate at the given power setting, air density due to altitude, and specific fuel consumption of the aircraft are critical. The colder temperature generally leads to denser air, which can improve engine performance efficiency to some extent, allowing for longer flight times.

The calculation for flight time generally involves knowing the aircraft's fuel flow rate at a specified power setting and factor in the total fuel available. However, in this specific scenario, the provided answer is based on established flight planning data which have predefined averages for aircraft performance under these conditions. This simplifies the estimates significantly and helps pilots make quick decisions.

Thus, the choice of 4 hours 1 minute is the selected answer as it aligns closely with expected results from endurance