Hull characteristics

	Length Over All, LOA, feet (optional input)
	Length of Waterline, LWL, feet
	Beam on Waterline, BWL, feet (optional input)
	Exit Angle, qAFT, of Aft Quarter Butt, an explanatory diagram is provided on the References Sheet of this template.  This value is critical for proper hull operation and it is therefore checked in this analysis.  For complet details about this requirement refer to Pages 12 and 13 of Reference D.
	Constant for Crouch's formula, representative values given on outputs sheet.  Alternatively this value may be calculated based on input (speed, weight and horsepower) provided from a similar vessel.

Weight information

	Vessel light ship weight, pounds, the weight without any people, luggage, personal gear, provisions, stores, fluids or cargo on board
	Weight margin on light ship, percent.  This is optional input and default values are provided.
	Cargo weight, pounds, usually can be left at zero default value.  Examples of cargo weight are fuel drums on deck, weight of fish and ice on board.
	Number of crew and number of passengers, integer
	Additional equipment not included in light ship, pounds
	Duration of voyage, days, for calculating provisions and stores, this value can often be left at it's default value which is equal to zero
	Personal crew gear and passenger luggage, pounds, can be set to zero
	Portions of total fluid capacities to be applied in analysis, default values that are set at 2/3 are provided, however these values may be specified as inputs.
	Main propulsion fuel tank capacity, gallons, & fuel type (diesel or gasoline).  This is a highly recommended input value, if provided an estimate of the vessel's range will be automatically computed by this spreadsheet.
	Potable water tank capacity, gallons
	Sewage holding tank capacity, gallons

Propulsion Plant Details:

	Installed brake horsepower, if unknown guess an amount, this value can be easily changed once these calculations are done.
	Parasitic loads, horsepower, for pumps, generators, etc.
	Continuous operating rpm, percentage of maximum, guideline values are given on the input sheet, simply select the applicable rpm percentage
	Shafting efficiency, ratio, guideline values are given, select appropriate value
	Propeller efficiency, ratio, a default value is present, however another value may be substituted in the calculations
	Vessel range required, nautical miles, optional input.  If this value is specified this spreadsheet will automatically determine if the tanks provided are adequate to make the voyage distance specified by this input.

For each of the input speeds the following is output are computed by this template:

	Effective Horse Power, EHP
	Brake Horse Power, BHP
	Continuous Horsepower, BHP0
	Estimated Range, nautical miles, from fuel consumption rate and tank capacity

The total operational weight is automatically computed based on light ship margin selected, cargo present, persons aboard, voyage duration which affects stores and provisions, selected operational tank capacities and gear on board.

Supplemental values like displacement length ratio, estimated maximum possible displacement speed, estimated fuel consumption rate, speed length ratios.

Calculative Checks are made for the following criteria:

	Check if installed horsepower will meet the required horsepower needed for continuously operating at the speed computed.  It is important to know that If the speed involved is not a continuous operating speed this check should be ignored.  These speeds include those used for burst mode operation (operations only for short periods at this speed) and transitory speeds (when accelerating or decelerating towards a continuous operating speed).
	Check if range requirements will be meet at the speed evaluated.  If this check is met the fuel tanks are adequately sized, if not the fuel tanks should be increased in size, but only for continuous operating speeds.
	Check if hull bottom aft exit angle at quarter butt is appropriate for speed computed.  If this check is not met the bottom shape at the aft end of the hull should be flattened more so this speed can be reached by the hull.

Reference A: Doug Shryverk, article entitled "Making Sense of Engine Options," Motor Boating and Sailing, February 1977 issue. 

Reference B: Valentine Jenkins, article entitled "Building Fast Boats that Don't Break," Professional Boatbuilder Magazine, Oct.-Nov. 1997 issue.

Reference C: Lorne Campbell, Letter to Editor regarding article entitled "Building Fast Boats that Don't Break," by Valentine Jenkins, Professional Boatbuilder Magazine, Oct.-Nov. 1997 issue.

Reference D: Dave Gerr, Propeller Handbook, International Marine, 1989, Camden, Maine.

Reference E: Dave Gerr, Nature of Boats, International Marine, 1995, Camden, Maine.

Reference F: John Teale, article entitled "Teale on Trawlers," Motor Boating and Sailing, June 1981 issue.

Reference G: Robert P. Beebe, article entitled "Trawlers - Designing by the Numbers," Motor Boating and Sailing, January 1977 issue.

Reference H: Alfred D. Isaacson, paper entitled "Sewage Polution Control: A Guide for the Ship Owner & Design," SNAME Marine Technology, July 1977 issue..

Reference I: S9086-C6-STM-010/CH-096R1 "Naval Ships' Technical Manual Chapter 096 Weights & Stability," NAVSEA, 2 August 1996.

Reference J: Detroit Allison Diesel, article entitled "Calculating Hull Speed," Motor Boating and Sailing, February 1978 issue.

Reference K: Robert P. Beebe and James F. Leishman, Voyaging Under Power, Third Edition, International Marine, 1994, Camden, Maine.