The San Francisco de Asis was a xebec, one of a class of relatively small three-masted sailing vessels used around the Spanish and Portuguese coasts. Her fore and mizzenmasts were lateen rigged, and her mainmast was square rigged, having three sails - main, lower main, and upper mainsails. This type was frequently outfitted with oars for use in calm water, but there is no indication that this vessel was so equipped.
Ware, John D.
"A View of Celi's Journal of Surveys and Chart of 1757,"
Florida Historical Quarterly: Vol. 47
, Article 5.
Available at: https://stars.library.ucf.edu/fhq/vol47/iss1/5