Question

What is the typical range for empty weight fraction?

(a) 0.3-0.7

(b) 0.1-0.125

(c) 0.14-0.28

(d) 0.25-0.27

This question was addressed to me during an interview.

Question is taken from Conceptual Sketch Sizing in section Conceptual Sketch Sizing of Aircraft Design

Answer 1

Correct answer is (a) 0.3-0.7

To explain: Empty weight fraction has typical range from 0.3-0.7 according to historical guidelines. Higher empty weight fraction indicates more weight. The range given is based on typical guideline and hence in some cases it can go beyond 0.7 as well.