To the discussion page I added a remark on the mean air speed of the Betz maximum efficiency theory. 84.80.66.78 (talk) 22:49, 13 October 2008 (UTC)desertfax
To the discussion page I added a remark on the mean air speed of the Betz maximum efficiency theory. 84.80.66.78 (talk) 22:49, 13 October 2008 (UTC)desertfaxReply