Minimum Propeller Diameter.				How To
		Formula
			D = 4.07 x ( square root ( beam WL feet x Hull draft (exc. keel) in feet ) )
		8.5	BWL		16	max prop dia input
		2.3	HD
		1	# motors					1	adjustment
								0	factor
		1.00	Adjustment factor for # motors					0	calculation
		18	Minimum Prop Diameter to efficiently drive hull in all conditions
			You have selected too small a max prop dia for this hull!
	If you see the "too small max prop dia" warning above, it means that the maximum prop diameter input by you
	on the "Input Data Here" sheet is too small. If this is the maximum size that will fit the hull then you
	need to carefully examine the hull, as there is apparently insufficient diameter available for a propeller
	of appropriate size. Or you may need to reduce gearbox ratio to increase prop RPM.