Abstract: A lengthwise adjustable forked boom for surfboards comprises two principal bars (1) bound by a forked boom head piece and two extension bars (3) telescopically adjustable in them. The extension bars are interconnected at the leech by a forked boom tail piece. At the end of both principal bars (1) is a connecting bush (6) that extends beyond the bar ends, attached securely with a catch lever (7) that has locking bars (8) which lock into the corresponding adjustment holes (9) in at least one series of holes at equal intervals in the extension bars (3) when the lever (7') is closed.

Abstract: A tailpiece for a forked boom of a rig for surfboards, comprising a tube bend segment (9), carried by a tube bend (10) to which is fastened bars (3) of the forked boom. On the upper side of the tube bend segment (9) there is a plate (12) with a wide straight-through slit (13) for receiving a fastening ring (14) of the clew (8) of the sail (7). The bend segment (9) has a rear opening (15), and a spring-loaded latch (16) is exposed through this opening (15). A hook (17) on the latch (16) swivels in and out of the fastening ring (14) of the sail (7) under the influence of a spring (21).

Abstract: The fastening for foot-loop straps of surfboards has fastening bars (6) placed on the board upper side in the board body at intervals, location holes (36) at equal intervals with an insertion slot (37), an undercut (38), and an upper side positioning nut (39) for the insertion of locking bars (40) each with a swivelling handle (41). The locking bars (40) are positioned so they can turn in fastening plates (42) and have a locking bar nose (44) matching the insertion slot (37) of the bores (36) in the fastening bars (6). By turning the locking bar (40), which is placed in a location hole (36) of the fastening bars (6) corresponding to one of the desired positions chosen for the foot-loop straps, the locking bar (40) interfits with the nose of the locking bar (44) like a bayonet catch with the undercut (38) of the location hole (36). The foot-loop straps can be fastened in the desired position on the surfboard and removed from the surfboard simply and quickly without using tools.