WW,
There is a main sheet on the sail. Its attached to the end of the boom. Used light line, hard to see on video. This is a homemade sail my wife sewed for me. 35 sq ft of sail. Called a leg o mutton designed by Phil Bolger. The sail is usually made 59-60 sq ft, but I felt that would be too much for this boat.
Great sail. The boom is high, no chance of contact to my skull.

My other sail is a 45sq ft lateen. More horsepower, but not necessary with this boat.
The 35 sq ft sail moves this boat with the lightest of breeze. Sailed yesterday in 11 mph winds, proved to be exciting.
Larry