Wind turbine ring vortex aircraft encounters

Mentioned by Tom as an unexpected externality of wind-power siting: ring vortices from large-blade turbines have entrained small aircraft. Used jokingly in the context of Martha's Vineyard wind-farm opposition.

Actually I was talking to a guy yesterday — there's something called a ring vortex from these wind turbines, and planes will get caught in these. Some of these things have 100-foot, 150-foot blades, and they're not going very fast, but they create a ring vortex. Some small planes have gotten caught in the turbine and can't get out. I said, well, that'll solve the problem for the people in Martha's Vineyard — they can either have wind turbines or visitors, because a lot of people like to fly into the Vineyard.