>From the figures quoted the payback period sounds like at 
least 2 years and may be rather more, depending on wear and 
tear on the sail.

Good by many standards, but certainly not 'free'.


    Russell

> "German ship fights climate change with high-tech kite"
> http://www.reuters.com/article/inDepthNews/idUSL1548100520071217?sp=true
>

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