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Installing SkySails on a vessel costs about $2.5 million, and there are currently only two ships using it.

http://www.maritime-executive.com/article/sailing-to-the-future

Hypothesis https://hypothes.is/a/4pSbWRxBRZS9EU0rVaL79Q
"Forexample, in a 2–MW wind turbine, the weight of the rotorand the tower is typically about 250 tons [10]. As reportedbelow, a kite generator of the same rated power can beobtained using a 500–m2kite and cables 1000–m long, witha total weight of about 2 tons only."
Is this a reasonable claim?

Get a copy of "report on the experiments" referenced in Kite Journal Fall 2004? - mshook@gmail.com - Gmail https://mail.google.com/mail/u/0/#label/interesting/14e99413c5a5ca05

Airborne Wind Energy: It's All Platypuses Instead Of Cheetahs | CleanTechnica
A & of a bunch of high altitude
http://cleantechnica.com/2014/03/03/airborne-wind-energy-platypuses-instead-cheetahs/

KiteGen 2006 Sardegna tests - YouTube https://www.youtube.com/watch?v=raWyvOs0RZM
Lots of detail in the captions

KiteGen Stem - YouTube https://www.youtube.com/watch?v=3fINSbhLhAg
The second half explains several results

"in a 2–MW wind turbine, the weight of the rotor and the tower is typically about 250 tons [...] a kite generator of the same rated power can be obtained using a 500–m2 kite and cables 1000–m long, witha total weight of about 2 tons only."

http://www.dariopiga.com/Papers/Conference/ICREGA2010Kite.pdf

" the SKS C 320 towing kite system with a towing area of 320 m2 – replaces up to 2 MW of the main engine's propulsion power."

SkySails GmbH - 2. Demonstrator (1 MW) http://www.skysails.info/english/power/development/2-demonstrator-1-mw/

SkySails GmbH - SkySails in Airspace http://www.skysails.info/english/infocenter/background-information/skysails-in-airspace/

"In routine operations the towing rope of the 160m² towing kite of the SKS C 160 is let out to a length of approx. 280 meters, and the towing rope of the approx. 300m² towing kite of the SKS C 320 is let out to a length of max. 420 meters. "