A leg-of-mutton sail (LOM) is a simple triangular sail set on a long spar mounted horizontally on the mast. It runs in a fore-and-aft direction. The leg-of-mutton uses a spar mounted high instead of a boom. This gives the helmsman more visibility and there is no boom hit his or her head on. It is a favorite type of sail for small boats. These include puddle ducks and canoes. A LOM is very similar to a spritsail. But instead of being square or having four corners, the LOM has three. Instead of the spar being mounted diagonally, as with the spritsail, it is mounted horizontally.
- A. Hyatt Verrill, The book of the sailboat: How to rig, sail and handle small boats (New York; London: D. Appleton and Co., 1916), p. 40
- David 'Shorty' Routh. "My favorite sail, the Leg-o-Mutton Sprit". Duckworks Magazine. Retrieved January 7, 2017.
- David Routh. "The Super Awsome Leg-O-Mutton Sail Rig". PDracer.com. Retrieved January 7, 2017.
- "Sails and Rigging". History of Wooden Canoes. Dragonfly Canoe Works. Retrieved January 7, 2017.