Credit: Aldo Cherini for the sketch.
The hull lines were based on one of the three ancient prehispanic boat excavated in Butuan, Philippines, back in the early 70’s. These boats were carbon dated 320 AD, 990 AD, and 1250 AD. This rockered boat is from the lines of Balanghay No. 2 which was drawn by T. Vosmer of Philippine National Museum.
The original hull construction of this historical boat is edge-pegged wooden plank, but this particular project will be using cold molded wood and fiberglass composite, and epoxy as adhesive. Embracing modern materials and construction method to revive the shape of an old hull. Similar to a present-day Bangka, the typical shape remains the same thru centuries, but the materials used evolved relative to what is practically available.
The length and beam of this boat is 12 meters (40′) and 2 meters (6’7″) respectively. The displacement capacity is 3 metric tons. Its hull volume is bigger than the prevalent Bangka for the same length. The main hull is stable enough without outriggers when navigating through narrow rivers.
A fully submerged Ama is designed to a buoyancy force 377 kgs, limits the maximum sail area of 24 square meter to a 30 knot windspeed. A good sailing weather of less than 20 knot wind can allow the sail area up to 49 sq.m. Balangays can be configured to have twin-masted Oceanic sprits sails. Lug and Gaff sails were also adapted as seen in old sailor’s journals.
This type of boat was mainly used of inter-island trading, but modern applications can be liveaboard and crewed charter.
The exterior brightwork finish will showcase the rustic appearance of the boat. The interior however, can have the conveniences of a modern life.
Photos shown here is a 1 meter scale model. It gives a glimpse of its stability and actual three dimensional shape.