Which configuration places the propeller at the rear to keep forward sensors clear?

• A. Tractor.
• B. Flying Wing.
• C. Canard.
• D. Pusher.

Answer: (D)

Placing the propeller at the rear is a pusher arrangement. With the prop behind the aircraft, forward-facing sensors and cameras sit ahead of the rotor and its wake, reducing the chances of propeller blur or dust and prop wash affecting what the sensors see. This setup helps keep those forward sensors clear and unobstructed during flight.

A propeller in front, known as a tractor arrangement, would put the rotor between the sensors and the air ahead, increasing the risk of obstruction or interference. The other terms describe airframe layouts rather than where the prop sits, so they don’t specifically address keeping forward sensors clear.