Which statement about the upturned exhaust is true?

Which statement about the upturned exhaust is true?

• A. Hide Aircraft Heat Signature
• B. Reduce Fuel Consumption
• C. Increase Noise
• D. Reduce Drag

Answer: (A)

Upturned exhaust is designed to lower infrared visibility by shaping the hot exhaust plume so it radiates less heat to external sensors. Pointing the exhaust upward keeps the hottest gases away from the airframe surfaces and allows the plume to mix with cooler surrounding air, reducing the radiant heat detected from typical viewing angles. This keeps the aircraft harder to spot with heat-seeking equipment. It doesn’t directly improve fuel efficiency, and while exhaust geometry can influence noise or drag in some cases, those aren’t the main reasons for this design.

Upturned exhaust is designed to lower infrared visibility by shaping the hot exhaust plume so it radiates less heat to external sensors. Pointing the exhaust upward keeps the hottest gases away from the airframe surfaces and allows the plume to mix with cooler surrounding air, reducing the radiant heat detected from typical viewing angles. This keeps the aircraft harder to spot with heat-seeking equipment. It doesn’t directly improve fuel efficiency, and while exhaust geometry can influence noise or drag in some cases, those aren’t the main reasons for this design.