Heeling right|thumb|Boats heeling in front of Britannia Bridge in a round-Anglesey race 1998 A sailing vessel heels when the boat leans over to the side in reaction to wind forces on the sails.
Heeling riGht|ThUmB|boats heeliNg in front of BRitannia bRIDge in A rOund-ANgLesey Race 1998 a sailing VesSel heels wHen the boAt leans over to tHe side iN reActIon To WinD fOrCeS On THE sailS.