In the center of the vessel is a single mast with a tripod base.

Behind them, her huge wagon was secured to the single mast, since there didn't seem to be much else to tie it to.

The ships have a single mast with a square sail.

Their ships had a single mast with a horizontal square sail on it.

It had a single tall mast and a flat, square sail.

The radar and other sensors are mounted on a single central mast thus allowing 360-degree view.

From two cables' length away he recognized the slim figure standing beside the single mast.

A derrick was added to the single mast to lift cargo.

It had a single mast with a square sail.

We had lost our single mast, snapped halfway down, and I couldn't step a new one at sea.