This is an automatic calculation for 3 BLADE prop from shaft horsepower and rpm at prop on Torque sheet.
		14	Propeller Diameter in inches.			13		12		11
						The alternatives in light blue squares
		7	Propeller Pitch in inches.			9		12		14
					16	max input dia
		0.33 disc area ratio blades. (This means 33% of the "disc" area of prop dia is blades)
		Rules of thumb.
			One inch diameter = 2.5 inches of pitch.
			Two inches extra pitch will cut engine rpm by 450.
		If you can't fit the indicated diameter due to clearance, or have plenty room left, the rules
		of thumb above will be a useful guide.
	If you find yourself way off, you have either entered bad data or have a badly configured vessel!