Difference between revisions of "Stability and Seakeeping"
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*Second method is called The Dellenbaugh Angle Method [page 296] | *Second method is called The Dellenbaugh Angle Method [page 296] | ||
*At page 299 there you can find a the flowing table which allows you to judge a boat's stability by analyzing the transverse metacenter GM. | *At page 299 there you can find a the flowing table which allows you to judge a boat's stability by analyzing the transverse metacenter GM. | ||
| + | **Note 1: If G is below M the vessel is stable and if G is above M than the vessel is unstable | ||
| + | **Note 2: A vessel with a large GM comes to the upright position very suddenly, whereas a vessel with a small one comes to the upright position more slowly and is more comfortable in a seaway | ||
<u>Table of Trans. GM for different Types of Vessels</u> | <u>Table of Trans. GM for different Types of Vessels</u> | ||
Revision as of 14:54, 26 November 2009
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Norman L. Skene's(in SKENE'S ELEMENTS OF YACHT DESIGN) gives 2 methods of judging the sea-keeping and stability of a boat, methods based on statistical stability diagram of several boats.
- Firs method is called Wind pressure Coefficient Method [page 292]
- Second method is called The Dellenbaugh Angle Method [page 296]
- At page 299 there you can find a the flowing table which allows you to judge a boat's stability by analyzing the transverse metacenter GM.
- Note 1: If G is below M the vessel is stable and if G is above M than the vessel is unstable
- Note 2: A vessel with a large GM comes to the upright position very suddenly, whereas a vessel with a small one comes to the upright position more slowly and is more comfortable in a seaway
Table of Trans. GM for different Types of Vessels Harbor vessels, tugs | GM=0.35-0.45 m Small power cruisers | GM=0.60-0.76 m Shallow-draft river boats | GM= 3.65 m Merchant streamers | GM=0.30-0.91 m Sailing Yachts | GM=0.91-1.37 m
