Ok, the "extra yards" finally clicked for me, along with the fact that you are not a native nautical english speaker.
The term in english is "studding sails" (also referred to as "stun'sails").
The studding sail yards (called "booms") are carried in iron hoops forwards and above the yards when stored (stowed) away and not in use. In use, the booms were run out through the hoops so that half their length extended past the supporting yard's end.
Depending on the wind and sailing direction, these could be run out on one or both sides of the ship. The actual studding sail sometimes had a yard at its head to hoist it, sometimes not.
In all cases, the rigging for studding sails is considered "flying" in that all the parts were set up to need. So, the booms were pretty simple, no real complicated blocks or fittings. Sailors slithered out to the ends and tied off the sails, and the yards were braced around to the wind, and off you went.
The lowest studding sails were set from booms on the course yards, and on booms hinged from the deck. Those lower booms required considerable work, and the lashing and handling of them was right in the way of the upper gun deck or carronades--so, it was something you did only when speed was more important than tactical advantage.
Royal yards were often set "flying" as well (I forget if that's the case with Victory). The yard and furled (folded) sail would be hoisted to the topgallant top. A block would be attached below the mast truck, and a halyard (:haul yard) tackle used to carry the royal yard to the peak. The clews of the royal sail would be lashed to the yard arms of the topgallant yard. Then, haul in the tackle to lift the yard up, and give it a parrel lashing to hold it to the mast. Some navies used braces on the royal sails, others counted upon the wind and topgallant braces to set the correct sail angle.