Abstract: A furling boom comprising: a drive housing adapted for mounting on a mast, the housing comprising a drive take off and a boom support. A boom of substantially c-shaped cross section is pivotally connected to said boom support by a universal joint and having its opening facing upwardly. An elongated mandrel extends within the boom and is connected at one end by a universal joint to the drive take off and at its other end by a rotating floating axle pivotally connected to the free end of the boom, whereby the foot of a said is connected to the mandrel and furled thereabout upon rotation of said mandrel. A drive unit mounted on said drive housing. The floating axle prevents binding and friction during furling and unfurling when the mandrel is bent upwardly. The drive housing reinforces the mast at the connection of the boom.