What shapes are used to prevent boats from tipping over in storms?

combination of shape, strength , careful positioning of draft , centre of gravity stops boat becoming bowled on waves - , if done well, getting upright again if become overwhelmed. (see film).

boat shape compliments combination , different shapes have different characteristics.

seaworthy designs in world cutters of coastguard.

@ mouth of columbia river on west coast, nature has contrived produce 1 of roughest bodies of water in world.

coast guard has found on many years of experience , design best type of boat shape use in these waters double-ended v-bottom type, deep forefoot , high, flared bow, has subsequently evolved there.

combination, bow stern, of types of hull-shape, great deal of fine tuning, produce type of vessel puts extreme seaworthiness @ somewhere near pinnacle.

advantage of pointed (also rounded) stern reduce tendency of broaching in quartering sea. means swung around , out of control force of following wave:-

"if forefoot deep , there no skeg, may impossible steer such boat. when boat of profile runs down wave, buries nose in water , stern lifts high , clear … [lifting rudders , propellers clear, , making them useless] … around goes, pivoting on deepest point, bow. next step in tragedy violent rolling in trough of seas. capsizing or swamping last act.

if deep forefoot desired, profile must balanced @ stern deep skeg , rudder. … every line must compromise" ¹

[typed in book, below. not copied , pasted.]

design resulting vessel used rnli (royal national lifeboat institution - uk national coastal rescue service) number of boats being purchased coastguard.

boats signified 'waveney' class of lifeboats here in uk, numbers beginning: 44 001 / 2 / 3 etc.

here super film, , pics, of of these vessels (together earlier , later incarnations) on station, possibly @ morro bay, or aforementioned mouth of columbia river, usa:

lifeboat cutters:

http://www.youtube.com/watch?v=vesgfkgp0...

enough performance set mind (and bowels!) @ rest? ;-))

'waveney' features quite bit here, (spot 44 on bow) best view @ 2. 05 minutes video (towards end) cruising along in flat calm water shore in background). in calm, 17 seconds in, on right.

in rough conditions, seaworthiness function of person @ helm, ultimately.
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¹ skene's elements of yacht design. revised francis s. kinney. adam & charles black. london. © 1927, 1935, 1938, 1962 dodd, mead , company, inc.

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in rough weather, best boat shapes/designs prevent boat tipping, asking boat 32-42' x 16' wide, , 18' tall designed drive 20-80mph 20-40 being normal speed.

thought of huge waves tipping boat scares **** outta me

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