That effort eventually led to a pilot farm 2 miles off Culebra Island in Puerto Rico.

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"It is not a hybrid, " says John Mckenzie, a 38-year-old helicopter pilot who owns a farm near Dingwall in Ross-shire.

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Over the next few months, though, the company hopes to install a pilot system at a dairy farm in Texas near the New Mexico border, where water is scarce.

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An aircraft pilot has said he is "seriously concerned" for the safety of low-flying aircraft if a wind farm is built near Bristol.

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