Claim No 1 in patent No 1.258.317 reads as follows : " A wind-propelled vehicle comprising body means , an unstayed spar connected to said body means through a joint which will provide universal-type movement of the spar in the absence of support thereof by a user of the vehicle , a sail attached along one edge thereof to the spar , and a pair of arcuate booms , first ends of the booms being connected together and laterally connected on said spar , second ends of the booms being connected together and having means thereon connected to the sail such that said sail is held taut between the booms " .
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