5 kg / kW would lead to 3 tons / 600 kW for M600 which has already some difficulty to make positive generation with a wind speed below 11-12 m/s, weighing “only” about 1.7 ton in total. This would augur for the limits of the crosswind fly-gen (by using secondary turbines) method in terms of commercial viability.
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Just happened to see this article on why generators fail in my email inbox this morning: