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This is a relatively new concept when it comes to kickers. It originates from sailing dinghies, and keelboat classes like Laser SB3, where it allows more space for the crew to move underneath the boom, close to the mast. As the Gnav is fitted above the boom it is out of the way and you will experience a huge gain in cockpit space.
A Gnav is a fixed aluminium compression strut fitted between a hinged or fixed fitting on the aft side of the mast and a slider in the sail groove of the boom. The sail must be loose footed as the sail groove is occupied by the Gnav slider. A strap from the slider is lead down to the cockpit. When the strap is tensioned, the slider moves forward and the boom is pushed down. Release the strap and the mainsail will lift the boom.
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Keelboat Gnav + Brackets is part of the Seldén Rodkicker or Gnav range used to control boom position and vang load. This is a relatively new concept when it comes to kickers. It originates from sailing dinghies, and keelboat classes like Laser SB3, where it allows more space for the crew to move underneath the boom, close to the mast. As the Gnav is fitted. Correct selection depends on the mast and boom section, the kicker or Gnav size and the attachment geometry already fitted to the boat. For replacement parts, compare the original bracket or end fitting and use the Seldén article number where available. For a new installation, check the relevant Seldén data sheet so the mast bracket, boom bracket, toggle and strut are matched as one system.
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