The article by Jessica Rowson (News last week) prompts me to suggest a design so that our "Angel" could be turned into the wind and the arms would rotate horizontally while occupying the same visual envelope.
Similarly our Skylon would have the same visual envelope, but with vertical vanes rotating on the axis.
Clearly I am suggesting a challenge in terms of design and technology.
We would not normally start from here.
Readers may be able to indicate the power output possible with an engineered solution to accommodate wind power generation built into the artists' concepts.
John Austin (M), Ealing W5 3AL