Wind Cone Mast

A Wind Cone Mast is the vertical structural support that holds the wind cone (windsock) at an elevated height, typically 6 to 10 metres above ground level. It provides a stable mounting platform that allows the wind cone to rotate freely to indicate wind direction. The mast is usually made from corrosion‑resistant materials such as galvanized steel, powder‑coated aluminium, or fibreglass. At the top of the mast is a swivel bearing or ring that allows the wind cone to rotate 360° with minimal friction. The mast may be designed as a frangible structure — meaning it will break away on impact to minimize damage to an aircraft — especially when installed near runways or taxiways. The mast also serves as a conduit for electrical wiring if the wind cone is internally illuminated.

The wind cone mast's purpose is to put the windsock where every pilot needs it — high enough to catch representative wind unaffected by ground-level turbulence, and positioned so it stays visible from the air and from the runway during approach, taxi, and takeoff. Because wind direction can shift with altitude and proximity to buildings or terrain, mounting height directly affects how trustworthy the visual cue is; a windsock too low or too sheltered can show misleading wind information at exactly the moment a pilot needs it most.

The mast's frangible design serves a second, equally important purpose: since the wind cone often sits close to a runway or taxiway precisely so pilots can see it clearly, that same proximity means it must break away harmlessly if struck, rather than becoming a rigid obstacle that could damage an aircraft during an excursion or wingtip strike.

Installed at all airfields, heliports, and military landing zones that require visual wind indication. Typically placed near the runway threshold, at the centre of the airfield, or at a location visible from both the approach and the apron. The mast is also used at fire stations, emergency helipads, offshore platforms, and any location where a windsock is needed. The mast height is chosen to ensure the wind cone is visible above obstructions (buildings, trees, other structures) and is within the pilot's line of sight during final approach.

The mast is founded on a concrete base, with a frangible coupling fitted where the installation falls within a runway strip, taxiway strip, or other frangibility-sensitive area, so the structure breaks away safely on impact. Siting follows the same clearance logic as the windsock it carries: positioned clear of buildings, trees, and other obstructions, and kept within the obstacle-limitation surface for the runway so it doesn't itself become a hazard to aircraft. Height is selected so the sock remains visible above surrounding obstructions and within a pilot's normal line of sight on final approach, and where illumination is fitted, the cable routing, whether an external floodlight supply or an internal conduit to a hoist-frame head fitting, is built into the mast design and installation from the outset.

The wind cone mast functions as a rigid vertical support that elevates the wind cone to a height where it is visible to pilots. The mast is anchored to a concrete foundation or ground plate, with guy wires (if needed) for additional stability in high‑wind areas. At the top, a low‑friction swivel bearing or ring allows the wind cone to rotate freely in response to the wind. The mast may be hollow to allow internal wiring for illuminated windsocks. In frangible designs, the mast is constructed with a breakaway coupling or from a material that will shear on impact, reducing the risk of serious damage to an aircraft that may strike it. The mast is also designed to withstand wind loads, ice accumulation, and corrosion, ensuring reliable long‑term operation.

The mast carries no sensors, controllers, or decision-making of its own — it is a passive structural member that two separate systems simply share. At the top, the swivel bearing and cone assembly respond mechanically to wind with no electronics involved at all. Where the installation is illuminated, a feeder cable from the same ALCMS-controlled lighting circuit that serves other airfield lighting is routed up through the hollow mast interior as a passive conduit run, with no junction box, sensor, or control point along the way, and terminates at the lamp housing near the swivel bearing at the top. The mast's only "control logic" is the frangible coupling's mechanical fail-safe: it is engineered to shear once impact force exceeds a fixed threshold, a purely passive structural response with no sensor, signal, or system decision behind it.

The mast is a vertical structural pole fabricated from galvanized steel, powder-coated aluminium, or fibreglass, sized in height and diameter to hold the wind cone assembly at the standard elevation while resisting wind loading up to its rated capacity, with guy wires used on taller or higher-wind-rated installations for additional stability. The base is set into a concrete foundation, ground plate, or flange mount appropriate to the site soil conditions, and where the mast is sited near runways or taxiways, a frangible coupling or shear-pin base is incorporated so the structure breaks away cleanly on aircraft impact rather than posing a rigid obstruction. At the top of the mast, a sealed ball bearing or low-friction swivel ring allows the wind cone to rotate a full 360° with minimal resistance, ensuring the cone tracks changing wind direction accurately. Where internal illumination is required, the mast is fabricated as a hollow tube with an internal conduit run from the base to the lamp fixture near the top, keeping wiring protected from weather and mechanical damage. All external surfaces and fasteners are corrosion-resistant, given the mast's permanent, unsheltered outdoor siting.