Forces on sails (3 m) = 5-m/s (≈10-knot) wind at 3 m above the water would be approximately "V" (15 m) = 6 m/s (≈12 knots) at 15 m above the water. In hurricane-force winds with "V" (3 m) = 40-m/s (≈78 knots) the speed at 15 m would be "V" (15 m) = 49 m/s (≈95 knots) with "p" = 0.128. This suggests that sails that reach higher above the surface can be subject to stronger wind forces that move the centre of effort ("CE" ) higher above the surface and increase the heeling moment. Additionally, apparent wind direction moves aft with
Black Hands, White Sails: The Story of African-American Whalers Black Hands, White Sails: The Story of African-American Whalers Black Hands, White Sails: The Story of African-American Whalers is a 1999 book by Patricia McKissack and Frederick McKissack about the involvement of African-Americans in the history of whaling in the United States. "BookList", in its review of "Black Hands, White Sails", called it a "fascinating look at the convergent histories of whaling and the abolitionist movement" and concluded "Less-skilled readers may have difficulty following the expansive narrative that pulls in details from several different angles, but history buffs and researchers should find the book's complexity rewarding." and "Library Journal" found