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A sailing device suitable for a pleasure boat or the like of narrow width which is small in restoring force against traverse tilt. The sailing device is characterized by comprising a sail portion A composed of a backbone, a pair of left and right spars 3a, 3b extending obliquely backward from the fo

A sailing device suitable for a pleasure boat or the like of narrow width which is small in restoring force against traverse tilt. The sailing device is characterized by comprising a sail portion A composed of a backbone, a pair of left and right spars 3a, 3b extending obliquely backward from the fore end of the backbone 1, and a sail-cloth 8 attached at the fore edge thereof to the pair of left and right spars and at the aft end thereof to the aft end of the backbone 1, and a strut 4 extending downward from the fore end of the backbone 1. The lower end of the strut is directly mounted on the boat hull for rise and fall or indirectly attached to the boat hull by support of a user.

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What is claimed is: 1. A sailing device suitable for use in a pleasure boat, comprising: a sail portion composed of a backbone, a pair of left and right spars extending obliquely backward from the fore end of the backbone and a sail-cloth attached at the fore edge thereof to the pair of left and ri

What is claimed is: 1. A sailing device suitable for use in a pleasure boat, comprising: a sail portion composed of a backbone, a pair of left and right spars extending obliquely backward from the fore end of the backbone and a sail-cloth attached at the fore edge thereof to the pair of left and right spars and at the aft end thereof to the aft end of the backbone; and a strut capable of being hinged at the upper end thereof to the fore end of the backbone to be movable between a position extending downward from the fore end of the backbone and a position along the backbone, the lower end of said strut being directly mounted on the boat hull or indirectly attached to the boat hull by support of a user to permit rise and fall movement of the strut, wherein said sail portion has left and right wing sections each provided with a dihedral angle, wherein said left and right spars are connected to each other at their intermediate portions by means of an upper tension rope, and wherein said left and right spars are connected at their intermediate portions to an intermediate portion of said strut by means of left and right tension ropes. 2. A sailing device suitable for use in a pleasure boat, comprising: a sail portion composed of a backbone, a pair of left and right spars extending obliquely backward from the fore end of the backbone and a sail-cloth attached at the fore edge thereof to the pair of left and right spars and at the aft end thereof to the aft end of the backbone; and a strut capable of being hinged at the upper end thereof to the fore end of the backbone to be movable between a position extending downward from the fore end of the backbone and a position along the backbone, the lower end of said strut being directly mounted on the boat hull or indirectly attached to the boat hull by support of a user to permit rise and fall movement of the strut, wherein said left and right spars are connected at their one ends to the fore end of said backbone for tilt movement, a slider is mounted on an intermediate portion of said backbone for slide movement in a longitudinal direction of said backbone, left and right rods are pivoted at their one ends to each intermediate portion of said spars and at their other ends to said slider, and a lower rod is pivoted at its one end to an intermediate portion of said strut and at its other end to said slider, and wherein said slider is moveable in the longitudinal direction of said backbone to extend said spars obliquely backward from the fore end of said backbone and to fold said spars along said backbone, said slider being engageable with a stopper hook fixed to the fore portion of said backbone when said strut is unfolded downward from the fore end of said backbone and is folded along said backbone. 3. A sailing device suitable for use in a pleasure boat, comprising: a sail portion composed of a backbone, a pair of left and right spars extending obliquely backward from the fore end of the backbone and a sail-cloth attached at the fore edge thereof to the pair of left and right spars and at the aft end thereof to the aft end of the backbone; and a strut capable of being hinged at the upper end thereof to the fore end of the backbone to be movable between a position extending downward from the fore end of the backbone and a position along the backbone, the lower end of said strut being directly mounted on the boat hull or indirectly attached to the boat hull by support of a user to permit rise and fall movement of the strut, wherein a lateral handle is mounted to an intermediate portion of said strut for operation of the sailing device, and wherein said handle is fixed in a lateral position when it is used and is folded along said strut when it is not used. 4. A sailing device as claimed in claim 2, wherein an unfolding rope connected at its one end to said slider is extended forward along said backbone and extended downward along said strut through a guide pulley mounted to the fore end of said backbone to move said slider forward when a grip connected to its other end is drawn by the user, and wherein a release rope is connected at its one end to said stopper hook to disengage said slider from said stopper hook when a grip connected to its other end is drawn by the user. 5. A sailing device as claimed in claim 2, wherein the central aft portion of said sail-cloth is detachably fastened to said backbone. 6. A sailing device suitable for use in a pleasure boat, comprising: a sail portion composed of a backbone, a pair of left and right spars extending obliquely backward from the fore end of the backbone and a sail-cloth attached at the fore edge thereof to the pair of left and right spars and at the aft end thereof to the aft end of the backbone; and a strut capable of being hinged at the upper end thereof to the fore end of the backbone to be movable between a position extending downward from the fore end of the backbone and a position along the backbone, the lower end of said strut being directly mounted on the boat hull or indirectly attached to the boat hull by support of a user to permit rise and fall movement of the strut, wherein an upper rib pivoted at its one end to the aft portion of said backbone to be moveable between a first position where it is approached above the aft portion of said backbone and a second position where it is approached to said backbone at its front end and apart from said backbone at its rear end, and wherein said sail-cloth is attached at its aft end portion to the rear end of said upper rib and is detachably fastened at its central aft portion to the front end of said upper rib or said backbone at a position near the front end of said upper rib. 7. A sailing device as claimed in claim 3, wherein an unfolding rope connected at its one end to said slider is extended forward along said backbone and extended downward along said strut through a guide pulley mounted to the fore end of said backbone to move said slider forward when a grip connected to its other end is drawn by the user, and wherein a release rope is connected at its one end to said stopper hook to disengage said slider from said stopper hook when a grip connected to its other end is drawn by the user.