Stiff Ship And Tender Ship: Ship Stability

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stiff ship tender ship

 

This is one of the most common questions of ship stability that what is the difference between a Stiff ship and a Tender ship.

Let us have a look at them one by one.

DESCRIPTION OF  A STIFF SHIP

 

  • stiff ship (vessel) is one with unduly large GM.

  • In such vessels angle of roll and period of roll is very small.

  • Rolling is violent and irregular.

  • It is uncomfortable for the crew on board because of jerky movements.

  • Hull of the ship undergoes severe stresses.

  • General cargo is likely to break loose due to jerky movements.

  • Bulk cargo is less likely to shift as angle of roll is small

  • There is no likelihood of  vessel becoming unstable during passage owing to consumption of Fresh water, Fuel and due to Free surface effect.

  • Vessels in a stiff condition have a greater ability to withstand the loss of GM (due to bilging).

  • Stiff vessels have a greater ability to withstand transverse shift of cargo.

  • Generally tankers and bulk carriers are in stiff condition.

 

DESCRIPTION OF  A TENDER SHIP

 

  • A Tender vessel is one with a small GM for her size, nature, type.

  • In such vessels angle of roll and period of roll  is large

  • Rolling is smooth and regular.

  • It is less uncomfortable for the crew on board as compared to Stiff vessels.

  • Less severe stresses are set up on hull of the ship.

  • General cargo, if properly secured is less likely to break.

  • Bulk cargo is more likely to shift as angle of roll is large.

  • There is high likelihood of vessel becoming unstable during the passage owing to the consumption of fuel, fresh water and due to Free surface effect.

  • Tender vessels have less ability to withstand a loss of GM because already the GM of such ships is small.

  • A vessel in tender condition has less ability to withstand transverse shift of the cargo as the list caused due to shifting of cargo is large.

  • Generally Timber ships, Ro-Ro, Car carriers and container ships are in Tender condition.

 

Hope this covers all basic aspects of stiff ship tender ship.

 

 

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