DIAMETER-HP-RPM Formula
		Finding diameter from HP and RPM
		Enter value for BHP (Brake Horsepower) , Engine RPM (RPM) and Gear ratio (RATIO)
		BHP	=	10		Engine Brake Horsepower
		SHP	=	9.6		Shaft Horsepower (computed)
		RPM	=	4000		Engine RPM
		RATIO	=	2		Gear Ratio (2:1 reduction)
		SRPM	=	2000		Shaft RPM (computed)
		D	=	632.7	*	SHP	0.2	/	SRPM	0.6
			=	632.7	*	9.6	0.2	/	2000	0.6
			=	632.7	*	1.572006171		/	95.63524998
			=	994.6083045				/	95.63524998
			=	10.40001783
		D	=	10
		Optimum Diameter for given RPM
		RPM		SRPM	Diameter				Diameter (rounded)
		6000		3000	8.15				8
		5000		2500	9.10				9
		4000		2000	10.40				10
		3000		1500	12.36				12
		2000		1000	15.76				16
		1000		500	23.89				24
	Optimum Diameter for Increased Horsepower
	BHP		10		20		30		40		50
	SHP		9.6		19.2		28.8		38.4		48
	RPM	SRPM
	6000	3000	8		9		10		11		11
	5000	2500	9		10		11		12		13
	4000	2000	10		12		13		14		14
	3000	1500	12		14		15		16		17
	2000	1000	16		18		20		21		22
	1000	500	24		27		30		32		33
		Minimum Diameter
	D	=		Minimum acceptable propeller diameter (in inches)
	BWL	=	8.16	Beam on the waterline (in feet)
	Hd	=	2.75	Depth of hull body to the fairbody line or top of the keel (in feet)
				Draft of hull = BWL (ft) * DEPTH of hull (ft)
	D	=	4.07	*	(	BWL	*	Hd	)	0.5
		=	4.07	*	(	8.16	*	2.75	)	0.5
		=	4.07	*	(	22.44			)	0.5
		=	4.07	*	4.737087713
		=	19.27994699
		=	19
	References : Propeller Handbook by Dave Gerr
	Paul Kane, Chelsea, Quebec
	Building the Glen-L Hot Rod :			http://www.boats.chelseacoachworks.com
	Revised : 03-FEB-2010