The Phugoid Idealized situation Small perturbations(h/, v)about steady level flight (ho, vo) h=h+b0=v0+ L=W(mg) for v=v0, but L N v2 ≈(1+2-+..)The Phugoid Idealized situation : • Small perturbations (h ′ , v′) about steady level flight (h0, v0) h = h0 + h ′ v = v0 + v ′ • L = W (≡ mg) for v = v0, but L ∼ v 2 , L mg = v 2 v 2 0 ≈ v 2 0 v 2 0 (1 + 2 v ′ v0 + . . .) 8