The aim now turns to answering the questions defined in the introduction by using the low-order model developed in Sec. 4. Before answering these questions, it is important to reiterate/emphasize the assumptions used in this section. First, it should be reminded that the design Mach number triangles and DF are fixed (*ϕ*_{d} = 0.60, *ψ*_{d} = 0.44, $\Lambda d=50%$, *M*_{b} = 0.1, and DF = 0.45). Second, if the mass flow, pressure, temperature, and radius are all set, then the span is fixed; hence, AR is varied by varying chord length. Third, mechanical constraints are assumed to exist, such that the absolute clearances and blade thicknesses (which include LE, TE, and maximum thicknesses) are assumed to be fixed. This means that as AR varies, clearance-to-chord and thickness-to-chord also vary. Finally, it is assumed that the axial gaps between blade-rows scale with chord. (In reality, this final assumption may prove to be the least valid, but it is necessary to simplify the problem into a manageable one.)