Hi Pierre: You’re right - I should have read it more carefully before commenting.
Radius is not diameter. Duh on me.
However, the conversation in that document could not take place among “real wind people”.
Here’s my friend Mike Bergey’s newest wind turbine model:
Excel 15 - Bergey Windpower Co.
It is now their only product, rated at 15 kW.
It’s the best buy, and most reliable small turbine available.
Rotor Diameter 31.5 ft (9.6m)
AWEA Rated Power 15.6 kW at 11m/s (24.5 mph)
Nominal Peak Power 25 kW @14 m/s (31 mph)*
So it’s almost the size of the proposed turbine in that paper.
This suggests the turbine in that paper if optimal, and if it even actually existed, might possibly produce maybe 30 kW. I’d hazard to guess 40 kW would be about the highest you could expect under any circumstances if shrouded, but then you get back to the reasons nobody uses shrouds in the first place - near-supersonic blades that make too much noise and often self-destruct.
I will say though, that this relatively new Bergey model DOES have a slightly larger diameter for its rated output than required, because it’s designed to produce in low wind speeds due to that extra rotor area, and it uses electric-braking stall-control for overspeed protection.
Meanwhile, small turbines are rated at 11 m/S (24.5 MPH) NOT 14 m/s (31 MPH)
Here’s a 60-kW-rated turbine.
60kW Small Wind Turbine | Renewable On-Grid & Off-Grid Energy Systems
It has TWICE the swept area of the proposed turbine of that paper, and weighs 6000 kg - not likely to be easily lofted by a blimp or balloon of any reasonable size.
As long as people have no experience in wind energy, they can make whatever bizarre assertions they want, and never get anywhere, whereas for “real wind people”, it’s all “been-there, done-that” stuff.
Even anyone who is just familiar with real wind products knows more than people writing these papers. The problem is “really smart people” who think they have nothing to learn, and can therefore just tell everyone how to do things based on their first impressions, without knowing their ass from a hole in the ground. As the saying goes, “They don’t know what they don’t know.” 