Displacement Speed			How To
		Formula for Speed : Length ratio
			True S/L ratio = Knots / square root ( LWL ) (B)
			Calculated S/L ratio = 10.665 / cube root ( max DISP / SHP ) (A)
	45	motor HP	1	# motors		7.79	Max "hull speed" (knots)
	6.00	% transmission losses				7	Reqd speed
	42	SHP at prop
	1.35	Speed Length Ratio (B)				1.72	Speed Length Ratio (A)
						1.54	Average of (A) & (B)
		30	Alternative estimate of SHP reqd based on average of (A) & (B) (guide only!)
	20	SHP reqd		42	SHP available		22	SHP for ancilliaries
				No Warnings. Sufficient SHP Available		Reqd speed within limits for economy