The Rig!

I use an exklamation mark in the title because when one who first sees a Ljungström boat, the rig is always the most startling.

The Ljungström rig consists of an unstayed mast - fairly unusual in the 30s. This mast sits on a bearing, and is supported at the deck with another bearing. The mast can rotate, and our boat has a drum below decks with a pulley system lead to a handle in the cockpit. Winding this handle turns the mast in both directions.
The mast has a normal mast-track, halyard, and down haul. The sail is raised and lowered as normal, with the halyard coming down the hollow mast, emerging below the lower bearing. The halyard is made fast on the mast step in the cabin.
The sail is unusual! It is effectively a diamond (kite) shape, folded in half, with a luff rope in the long axis. The sail has no boom, and is sheeted from the tips of the short axis with two sheets. This means that when "on-the-wind" the two sides of the sail lie together performing as one sail. When "off-the-wind" the sails split and are controlled independently.
This means that when running the boat has double the sail area than when reaching - just when you can handle it best.

The sail is reefed and furled by rotating the mast - the handle is mounted under the port deck in the cockpit. It takes about 10 turns to fully furl/reef the sail. The rotating mast also allows the leading-edge/luff of the sail to be moved to the optimum position wrt the wind - allowing a better foil to occur.

In practice she is the simplest and safest boat to get sailing on. No running around on deck when sailing, and no boom to watch for. She gybes safely, but can be slow coming about - probably due to the lack of jib. Reefing is a doddle! But I'm still learning to get the best from the rig, and will give regular updates.....