there is no such thing as a small two-masted vessel with a
mainsail and jib
View page
Mainsail was established in 2000 to provide marketing,
sponsorship, design, hospitality and event services. On August 30,
2012 Mainsail Limited was placed into creditors' voluntary
liquidation.
View page
The most common single masted sailing vessel with a mainsail and one jib is the sloop.
A cutter has one mast with one mainsail but two jibs.
A catboat has one mast and a huge mainsail but (usually) no jib. The mast is located very much forward on the vessel.
There are other sailboats that have just one mast and a mainsail such as the Sunfish or a Dhow, both of which have a lateen rig (one mast, one mainsail.)