==measurement== 
 The lengths of the bows at the start of the article are from the Mary Rose http://www.maryrose.org/ship/bows1.htm and are quoted in metric measurements. For consistency it should be metric first through out the article. Many English speaking people only learn the metric system at school as there are no imperial measurements  their country. Do people in the US not learn the metric system at school? There is no point putting in Newtons on ever measurement as anyone who is interested in that can calculate them providing the first one is left in place all it does is add clutter to the article.