Question

The level flight envelope is determined by ________

(a) stall limit lines and from zero specific power

(b) wing aileron size

(c) spoilers area

(d) tail area

I had been asked this question in an internship interview.

Asked question is from Flight Mechanics topic in chapter Performance and Flight Mechanics of Aircraft Design

Answer 1

The correct option is (a) stall limit lines and from zero specific power

Explanation: The level flight operating envelope is determined by using stall limit lines and zero specific power. The zero specific power lit is typically shown for both maximum Thrust and for military thrust. Tail area is based on tail sizing.