Flagpole mechanics in Finland – halyard, pulley and tilting base

A flagpole is a simple device, and its parts work together so that the flag rises smoothly and stays in place even in the wind. This guide describes how the halyard, pulley, cleat and tilting base of a flagpole work. The individual parts are described in the guide to flagpole accessories.

Halyard and pulley

The halyard is a closed loop that runs over the pulley at the top of the pole. The flag’s snap hooks are attached to one side of the halyard. When the opposite side is pulled down, the flag goes up. According to Suomalaisuuden Liitto, the flag is raised with calm pulls all the way to the top, and the halyard is wound a few times around the pole and tied firmly to the cleat. With the halyard taut, the flag stays at the top and cannot slide down in the wind.

External and internal halyard

On a pole with an external halyard, the halyard runs along the outside of the pole and is tied to the cleat. The construction is simple and easy to maintain. On a pole with an internal halyard, the halyard runs inside the pole and comes out through a hatch at the bottom. The halyard is locked behind the hatch so that it cannot be untied without a key. An internal halyard pole is quieter, because the halyard does not slap against the pole in the wind.

Revolving top

On many poles the finial and pulley are in a revolving top piece that turns with the wind. The flag or pennant then turns into the wind without the halyard wrapping around the pole. If the top jams, for example because of dirt or ice, the flag or pennant can wrap around the pole. More information is in the guide to flagpole repair.

Tilting base

A tilting base is a hinge at the bottom of the pole, bolted to the foundation. When the locking bolts are released, the pole can be lowered horizontally. The top piece, pulley and halyard can then be replaced or serviced from the ground without ladders or a lift. Lowering and raising the pole, however, takes space and often two people, since a long pole is heavy to handle. Some tilting bases have a counterweight or gas spring that makes raising easier.

Half-mast and the mechanics

When the flag is flown at half-mast, according to the Ministry of the Interior, it is first raised to the top of the pole and then lowered so that its lower edge is at the middle of the pole. The halyard is tied to the cleat or locked behind the hatch just as at full mast, so the flag stays in place at half-mast. The practice is described in the guide to half-mast.

Wind and the pole’s structure

The wind exerts a force on the flag, which is transmitted through the pole to the foundation. The force grows with the flag’s size and the wind speed, and a long pole acts as a lever, increasing the strain at its base. That is why the manufacturer designs the pole and foundation for a flag of a certain size. According to Suomalaisuuden Liitto, the flag should not tear on the pole, and so the flag is not raised in strong wind or a storm. Safety is described in the guide to flagpole safety.