Question

Which of the following is correct?

(a) Some clearance should be provided between propeller and fuselage

(b) Lift will be reduced if only drag is reduced

(c) Thrust will be lower than the drag always

(d) Engine exhaust does not make any noise

This question was addressed to me during an interview.

This question is from Configuration Layout Considerations topic in section Configuration Layout Considerations of Aircraft Design

Answer 1

The correct option is (a) Some clearance should be provided between propeller and fuselage

Easy explanation: Reduction of lift can be achieved by number of ways such as AOA reduction, drag increment etc. Thrust at cruise will be equal to the drag. Engine exhaust is primary source of aircraft noise. Hence, the correct statement will be ‘Some clearance should be provided between propeller and fuselage’.