Assertion: sail's edge | /r/Synonym | the luff
Facets:
value: on windward leech symmetrical sails
type: OTHER
Source sentences:
text: The forward edge of the sail is called the "luff", which inspires the term "luffing", a condition where the sail ripples because wind is crossing over the front and back side simultaneously.
text: However simply put, a sail should be pulled in until it fills with wind, but no further than the point where the front edge of the sail (the luff) is exactly in line with the wind.
text: The top of all sails is called the head, the leading edge is called the luff, the trailing edge is the leech, and the bottom edge is the foot.
text: The forward (leading) edge of a fore-and-aft sail is called the luff , and may be attached along a mast or a stay.  
text: The top of all sails is called the head, the leading edge is called the luff on fore-and-aft sails and on windward leech symmetrical sails, the trailing edge is the leech, and the bottom edge is the foot.
text: Patches (reinforcements) are added to each corner and tabling (a thickened hem) is sewn along the forward edge (called the luff) and the foot of the sail.