'If We Want Bigger Wind Turbines, We're Gonna Need Bigger Airplanes'

Long-time Slashdot reader schwit1 shared this article from IEEE Spectrum:

The world's largest airplane, when it's built, will stretch more than a football field from tip to tail. Sixty percent longer than the biggest existing aircraft, with 12 times as much cargo space as a 747, the behemoth will look like an oil tanker that's sprouted wings — aeronautical engineering at a preposterous scale.

Called WindRunner, and expected by 2030, it'll haul just one thing: massive wind-turbine blades. In most parts of the world, onshore wind-turbine blades can be built to a length of 70 meters, max. This size constraint comes not from the limits of blade engineering or physics; it's transportation. Any larger and the blades couldn't be moved over land, since they wouldn't fit through tunnels or overpasses, or be able to accommodate some of the sharper curves of roads and rails.

So the WindRunner's developer, Radia of Boulder, Colorado, has staked its business model on the idea that the only way to get extralarge blades to wind farms is to fly them there... Radia's plane will be able to hold two 95-meter blades or one 105-meter blade, and land on makeshift dirt runways adjacent to wind farms. This may sound audacious — an act of hubris undertaken for its own sake. But Radia's supporters argue that WindRunner is simply the right tool for the job — the only way to make onshore wind turbines bigger. Bigger turbines, after all, can generate more energy at a lower cost per megawatt. But the question is: Will supersizing airplanes be worth the trouble...?

Having fewer total turbines means a wind farm could space them farther apart, avoiding airflow interference. The turbines would be nearly twice as tall, so they'll reach a higher, gustier part of the atmosphere. And big turbines don't need to spin as quickly, so they would make economic sense in places with average wind speeds around 5 meters per second compared with the roughly 7 m/s needed to sustain smaller units. 'The result...is more than a doubling of the acres in the world where wind is viable,' says Mark Lundstrom [Radia's founder and CEO].

The executive director at America's National Renewable Energy Laboratory Foundation points out that one day blades could just be 3D-printed on-site — negating the need for the airplane altogether. But 3D printing for turbines is still in its earliest stages.

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