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Simplest AWECS Yet...

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  • dave santos
    Sorry to bore the forum with more tiny wingmill experiments, but they do illustrate KIS & agile-engineering. Here are three videos of a tailed wingmill to
    Message 1 of 1 , Jan 6, 2011

    Sorry to bore the forum with more tiny wingmill experiments, but they do illustrate KIS & agile-engineering. Here are three videos of a tailed wingmill to show something with crosswind action simpler even than a Chinese varidrogue. You can see the famous Jet Stream above the working AWECS. In some hard gusts the tail actually made tiny sonic booms! The wingmill is the area of a large pizza (a T-plan 4ft WS, 27" LOA, .2m Area) & barely deflected the 14 sq ft sled.

     

    The first clip shows power being extracted by the wingmill in a stiff breeze (~15kts/9hz/25N-2.5cm pulses) to work a spring scale. The second is the wingmill oscillating nice & steady in a medium breeze (~6kts/5hz/10N-1cm pulses). The third is a close-up of the wingmill in a gust (~20kts), acting semi-chaotic, but the pilot stays stable & power is being extracted. A longer tail would restore regularity.

     

    http://www.youtube.com/user/KiteLabGroup

    Attached JPG is a close-up of all components.
     
    OK, this toy is only a single-digit wattage (like many a solar cell), but the individual membrane wingmill can grow to megawatt scale & be aggregated into vast arrays. Its tricky to calculate the actual power of this .2 sq m scrap of Tyvek. Calculating 1-3 watts without optimizing further. A toy kite could carry it as is or the sled shown could lift one 5 times the area. Guyed sidelines &/or cornerblock-drogue would just about double output, as a lot of power is wasted on transverse sloshing. A cornerblock-drogue also enables single-point anchoring. A toy kite & flipwing may max out at 5-6 watts & the sled with wing at about 30 watts. The estimated "installed watt" price, including small gen or pump stage, is about the same as a solar panel, a dollar per watt. Thats not bad for starters, at only thirty-five feet high, plus it flies autonomously, even self-relaunches, & anyone unable to buy can make them in a few minutes from trash.
     
    Old Correction to DaveL- I misread the worn numbers on my smallest Newton scale a couple of years ago, with a much smaller handheld wingmill, the oscillation peaks were only 2.5 not 25 N (missed the decimal).

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