Hull/deck joint

With boats dating back to 1959, the aging of the Shark fleet is an issue that requires attention. The hull/deck joint has become a chronic problem with water leaking inside the cabin. Along with leaking of the windows, major structural damage can occur over a period of time. Rotting of bulkheads and stringers has happened and in some extreme cases, chain plates have been pulled out, resulting in loss of rig. Measurement Committee is reviewing the possibly of granting the glassing over of the hull/deck joint.

The concerns the Committee has:

·         Glassing over the joint changes the layout schedule of the boat, which conflicts with our specifications.

·         This may also add rigidity to hull over the original joint but it is unknown to what extent.

·         The cost and time involved doing the work has not been determined but will require some type of skill and knowledge.

On the plus, side this should stop the leaking of the water, should extend life of the boat and reduce maintenance on the boat. 

The Committee has determined the glassing over the hull/deck joint is a viable option in stopping the mitigation of water. It is the opinion of the Committee that the addition of a layer or two of fibreglass does not significantly strengthen the boat. In fact, the glass over the joint adds weight in a disadvantageous area.

The glass over the hull/deck joint may be done under the following criteria:

·         Item #2.3 of the Specifications. Builders and owners shall consult with ISCA and obtain written authorization before making any changes in construction of the boat, spars or equipment as covered by these Rules.

·         The mechanical fastening of the joint shall remain the method of attachment. The original type of fastening and quantity shall remain the same.

·         The glassing is only for the sealing of the joint and not a substitute for the mechanical fastening on the hull.

·          If there is a reduction in weight because of this work, the following shall take place:

o        Boats above basic weight (2100 lbs), this reduction shall be considered weight relief.

o        Boats below basic weight or boats that drop below the basic weight, the addition of corrector weights must be made equal or greater to the weight reduction. This weight must be added at the following locations:

§         The corrector weight must be permanently marked with the weight and shall be fastened in a permanent manner to the under side of the deck where the hull meets.  The weight shall be placed in front of the main bulkhead and/or in the area of the cockpit seats.

·         The boat shall be weighed at the basic weight after the work is complete, to determine if there was a reduction in weight. If the boat has never been weighed at the basic boat weight, then it must do so before the work starts.

·         All original tracks, railings, and fittings must be reinstalled upon completion of work.