Which statement best describes the weight characteristic of axial-flow compressors as a disadvantage?

Which statement best describes the weight characteristic of axial-flow compressors as a disadvantage?

• A. Relatively light weight
• B. Negligible weight
• C. Moderate weight
• D. Relatively high weight

Answer: (D)

Axial-flow compressors achieve high pressure and flow by stacking many stages of rotating blades and stationary vanes in a long, multi-stage arrangement. That extended hardware—numerous blades, stators, longer rotor shafts, and heavier casings—adds substantial weight to the engine. This extra weight is a disadvantage in aircraft design because it increases empty weight, affects payload and fuel efficiency, and requires stronger mounting and supports. The large, heavy assembly also brings greater rotor inertia, influencing spool-up characteristics and maintenance complexity. For these reasons, the weight of axial-flow compressors is described as relatively high.

Axial-flow compressors achieve high pressure and flow by stacking many stages of rotating blades and stationary vanes in a long, multi-stage arrangement. That extended hardware—numerous blades, stators, longer rotor shafts, and heavier casings—adds substantial weight to the engine. This extra weight is a disadvantage in aircraft design because it increases empty weight, affects payload and fuel efficiency, and requires stronger mounting and supports. The large, heavy assembly also brings greater rotor inertia, influencing spool-up characteristics and maintenance complexity. For these reasons, the weight of axial-flow compressors is described as relatively high.