Search results
Understanding and calculating marine displacement is essential for the design and operation of ships. This tutorial delves into the formulas and calculations associated with marine displacement, focusing on length, breadth, draft, and block coefficient.
Those two topics are covered first. The manner to determine a boat hull maximum displacement by both tank testing and by mathematical means (aka Simpson’s Rule) is covered. An example mathematical calculation follows. Then the three steps in determining the capacities – 1. Establishing an upper limit for weight capacity - (from boat ...
a. Waterline length and displacement entries are used to calculate speed length ratios and estimated hull resistance. b. Beam and hull depth entries are used to calculate optimum prop size. c. Prismatic coefficient is not used directly in calculations at this point. d. The speed/length ratio calculations are well known. The actual limiting ...
2 wrz 2019 · A rough estimate of horsepower for displacement type hulls is fairly simple: 1. Maximum "hull speed", in knots, is equal to about 1.3 X the square root of the waterline length of the hull in feet.
27 sty 2019 · What I did find is three easy ways to estimate total hull resistance for displacement vessels. There is hullcalc.xls which is the easiest to get an estimate of propulsive power you need to reach a certain speed.
14 lis 2006 · One small question: how is the hull displacement calculated? You need to know waterline length, waterline beam, and body draught amidships (just body, not total draught under the keel). Then you need the "Block coefficient" which may vary a lot depending on hull forms.
To do this, you need to know your boat’s displacement and add it to the current weight of the boat plus any cargo or equipment on board. You then divide the total weight by the waterline length to get the average weight per inch.
