6 Egypt Silk Mill 2pi wind turbine ; revisions 3 ; 15 April 2011 .

These figures revise the posts of 22 March and 4 & 14 April .

The change is a redesign of the feet for the main arch,

with an accompanying revision of the turntable .

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Their much broadened heels will better distribute the stress they carry to the turntable .

This is achieved by blending the arch's wing-form with an exaggerated curve,

based upon the 'humpback' geometry of the cores' inner ring .