Sizing to cruise speed requirements

From Chapter 1, part 3, page 162 thru 165 it can be seen that formula for cruise speed is;

V = 77.3{h_p(W/S)/σC_D(W/P)}^1/3                     note: V is in mph

or

V = (550SHPh_p / 0.5ρSC_D) ^1/3

	Sea Level		5000 ft
	mph	kts	mph	kts
Vcr @ 50% power =	123	107	130	113
Vcr @ 75% power =	141	123	148	129
Vcr @ 100% power =	155	135	163	142

Note: with 5 hours of usable fuel on board, at 75% horse power then range is 600 Nm at sea level.