Royal sails were normally found only on larger ships with masts tall enough to accommodate the extra canvas. Royals were introduced around the turn of the 18th century, but were not usually flown on the mizzenmast until the end of that century. It gave its name to a Dutch term for a light breeze—the Royal Sail Breeze or bovenbramzeilskoelte was a Force 2 wind on the Beaufort Scale.
- Dean King, A Sea of Words: A Lexicon and Companion to the Complete Seafaring Tales of Patrick O'Brian, 3rd ed. (New York: Henry Holt, 2000)
- See http://www.greatgridlock.net/Sqrigg/fullrig.html Archived October 11, 2006, at the Wayback Machine.
- García-Herrera, R., D. Wheeler, G.P. Können, F.B. Koek and M.R. Prieto (2003). CLIWOC multilingual meteorological dictionary, An English-Spanish-Dutch-French Dictionary of wind force terms used by mariners from 1750–1850. KNMI, De Bilt (Netherlands), p. 22. ISBN 90-369-2243-7.