Flagpole mechanics in Spain: halyard, arm and rotating head

Behind a flying flag there is simple mechanics: a rope, a pulley and some fastenings, or a rotating arm with a counterweight. Those mechanics decide whether the flag can be raised and lowered, whether it stays unfurled without wind and whether it can fly at half-mast. This guide explains how the common systems in Spain work.

The external halyard

This is the classic system. The halyard runs up from the base of the flagpole, through a pulley or sheave at the top and back down, forming a loop. The Flag Regulation describes that part on the flagpoles of State establishments as a disc or truck with a sheave for the halyard. The flag is clipped to the halyard with snap hooks; pulling one side raises the flag, and the halyard is tied to a cleat at the base.

It is the only system that makes it easy to raise and lower the flag and to leave it at half-mast. According to ClickBanderas, the flag is not fully unfurled and depends on the strength of the wind.

The internal halyard

The principle is the same, but the halyard runs inside the pole. According to Banderas VDK, it can work with an internal counterweight or with a pulley and crank; access is through a small lockable door. According to ClickBanderas, this makes the flag harder to steal and gives a cleaner finish. Like the external system, it allows the flag to fly at half-mast.

The rotating arm

On a flagpole with an arm, the flag is not hoisted. According to Banderas VDK, an arm mounted on a rotating base with bearings at the top of the pole holds the flag by its upper edge: the flag’s sleeve slides onto the bar of the arm, and a counterweight at the bottom tensions the fabric. The rotating base lets the whole assembly turn with the wind, and the flag stays extended at all times, even without wind. According to ClickBanderas, it is the most widely used system in outdoor advertising, but a flag that is too large does not unfurl properly and exerts excessive side load on the arm.

With this system the flag cannot fly at half-mast.

The rotating head

According to Banderas VDK, standard fibreglass flagpoles have the finial mounted on a bush and a rotating head. By turning with the wind, the head follows the direction of the flag and reduces the risk of it wrapping around the pole.

The flagpole in wind

Fibreglass bends with gusts and returns to its position; according to ClickBanderas, it absorbs gusts without passing the whole load to the base. Aluminium is more rigid and behaves more predictably in steady winds. In both cases, the wind load on the flag creates a bending moment at the base, greater the larger the flag and the stronger the wind. The guide to flagpole heights covers the wind zones.

Raising and lowering

On civil buildings, Law 39/1981 sets no times. In military units, under article 3 of the Regulation on Military Honours, the flag is raised at eight in the morning and lowered at sunset, and at ceremonies of tribute to the flag in which it is raised or lowered, the units render the honours of presented arms and the full national anthem (article 7).

Half-mast

Flying the flag at half-mast is simple on a halyard flagpole: it is lowered to an intermediate height, visibly below the top, and the halyard is tied off. On balcony poles, indoor staffs or flagpoles with an arm it is not possible; instead, Royal Decree 538/2020 provided a crêpe ribbon on the finial for indoor flags. The guide to half-mast covers this.