A studding sail, or stun'sl is an extra sail on a square rigged vessel for use in fair weather. It is set outside the square sails, using stun'sl booms which run out along the yards. They came into us
USS Monongahela with a full set of studding sails set
A painting of racing tea clippers by Jack Spurling, a marine artist known for his technical accuracy. This shows the reasonable maximum amount of stun'sls that could be set so that they did not interfere with each other.
Diagram of a topmast studding sail
Square rig is a generic type of sail and rigging arrangement in which a sailing vessel uses square sails which are carried on horizontal spars that, when at rest, are perpendicular to the centre line
Studding sail
…A studding sail, or stun'sl (pronounced stuns'l ) is an extra sail on a square rigged vessel for use in fair weather. It is set outside the square sails, using stun'sl booms which run out along the yards. They came into use some time in…
Main-mast of a square-rigged brig, with all square sails set except the course
The single-masted, square-rigged Humber keel performed well to windward.