Ship Stability Video 51: Severe Wind Criteria for Ships

The severe wind criterion is recommended for new decked seagoing passenger and cargo ships of 24m in length and over and applies to all loading conditions. The more stringent of earlier criteria and the weather criterion of the present recommendation should govern the minimum requirements for passenger or cargo ships. The figure involves marking area ‘a’ in the wind ward side and area ‘b’ on the leeward side. There is a unique formula to calculate 1.
The angle of roll (1) referred should be calculated using the tables that are provided & is dependent on moulded (breadth & draft) ratio, block coefficient, type of bilge keel length of waterline, rolling period & position of CG wrt waterline.
Capt.S.S.Chaudhari is an Indian Merchant Navy Captain with 45 years of experience under his belt including 29 years of teaching and training professionals. He is from ‘1978-79’, T.S. Rajendra batch. He commanded ships from 1990 to 1994, whereafter he said quits to sailing and started his teaching tenure in 1994, at L.B.S College of Advanced Maritime Studies and Research. In 1999, he completed Bachelor of General Law from Mumbai University.
In LBS, he was connected with most areas of maritime teaching at various levels up to Extra Masters. For several years, he had been in the panel of examinations by MMD, of various competency levels. He has also been a faculty and examiner of the Extra Master’s course since 2006. He was also associated with the examination of B.Sc Nautical Sciences, (Mumbai University). He was Chief Editor of a technical magazine ‘Horizon Ahead’ for over 5 years. He has been the principal of M.M.T.I. Dehradun, from 2014 till 2019.
During the 26 years of teaching, he has written several books. Chartwork, Celestial Navigation, Ship Stability, Cargowork, Navaids, Advanced Shipboard Management, Ship Construction (Vol I & Vol II), Legal Knowledge for first mate are to name a few. Capt. Chaudhari believes in sharing his knowledge with the fraternity.

[@dheerajsharma5091]

Beautifully explained sir.

[@capt.s.s.chaudhari5181]

Thanks and welcome

[@AlokSingh-hz9sp]

❤ excellent Sir

[@chaitanya9245392638]

Nicely explained , not needed to mug this up anymore without understanding.

[@capt.s.s.chaudhari5181]

Thanks for the good words.

[@ruzmatazz]

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[@ravindraKumar-cf9tx]

Best teacher of all time …. Right from basics to masters level. I did from Massa , mumbai …no one cleared my doubts but your videos did.
Thank you allot sir

[@capt.s.s.chaudhari5181]

Thanks for the good words.

[@rajatgarg1494]

Sir You Made it Very easy to understand and remember. Thanks a lot for sharing such great knowledge.

[@capt.s.s.chaudhari5181]

Thanks for the Good Words.

[@negisomeshn0]

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[@capt.s.s.chaudhari5181]

Thanks for the good words.

[@LordCommanderStanman]

Well explained!! Thank you sir!

[@capt.s.s.chaudhari5181]

Thanks & Welcome

[@justinpaulson1023]

Thank you Sir.

[@capt.s.s.chaudhari5181]

You are most welcome

[@RohitKumar-lh3xu]

Thanks a lot ... Great explanation..

[@capt.s.s.chaudhari5181]

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[@zaheerrulesable]

thank you sir.

[@capt.s.s.chaudhari5181]

Most welcome

[@ankitgujral5511]

Thank you so much , all doubts are well cleared 🙏

[@capt.s.s.chaudhari5181]

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[@RajendraSingh-bq2rx]

Thank you sir.
Nicely explained.

[@capt.s.s.chaudhari5181]

Thanks and welcome

[@pankajthakur3011]

Thank you a lot guruji... Was struggling to understand and get this for ASM orals...

[@capt.s.s.chaudhari5181]

Thanks for the Good Words.

[@bhajan2kaka]

sir thank you so much for the video lecture .

[@capt.s.s.chaudhari5181]

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[@varuntalwar2765]

Great inspiration for all needy students 🙏🙏 Really liked your way of teaching sir

[@capt.s.s.chaudhari5181]

Thanks for good words

[@robjvrghs5870]

How do we calculate the Theeta 1 (angle of roll to windward due to wave action) ?

[@deepdsouza6338]

Very well explained dear sir. I had the pleasure to sit for many of your lectures.
I take it that the calculation is based on Force 10 wind conditions. Approx. 55 knots. In case of very large Pax ships, say windage area of 14k + meters, will the same calculations apply. Recently I experienced about 70 knot with gust upto 75 kn. The heel experienced was much less (thankfully) than what the Napa load computer showed. Just wondering if the computer was calculating correctly.
What I was interested and want to ask was, how much wind (just approximately) would I be safe to take on the beam (300 m long ship x 25 m from half draft to air surface centroid). (The stability manual doesn't provide much info since the ship is 15 years old and did not need this criteria when it was built. The new manual has at best not very good information as I can gather)

[@capt.s.s.chaudhari5181]

Dear Deep,
504 N/mt sq is approximately gale force approximately 40knots. How much your ship heeled will also depend on the stability or GM of vessel. A general thumb rule should be that because of wind alone, the permanent list or heel should not be more than 80% of deck edge immersion. To find out if your ship will satisfy the criteria, the normal 4 tables which are provided and the two formulae can be used. Thanks for viewing.