Dreamweaver is the third in the sequence of "Seafax" autonomous boats.

Seafax I (Dreamtime) had enormous load carrying capacit for it's size but was slow and heavy.

Seafax II (Dreamchaser) was much lighter and faster but being a (tipy) monohull was incapable of producing the steady video footage required of it.

And so Seafax III (Dreamweaver) was concieved as a way of addressing all the shortcomings of it's predecessors.

The chosen hull was to be a catamaran, more specifically a "tunnel hull" variant, constructed essentially of 3mm aircraft grade plywood with 8mm birch plywood bulkheads and 12mm square hardwood stringers. All seams were filleted with glass fibre paste and the entire hull was eventually covered inside and out with 3 oz glass fibre twill.

Dreamweaver hull construction

A flotation test was done quite early on in the construction process to establish the best location for heavy items such as battereries. To perform the test labels were attached fore and aft to one side of the hull, the engines were fitted, and known equipment such as camera and ESC were placed inside the hull as near to their final position as possible. Four weights equavalent to the four 32 Ampere lipo battereris I wanted to use were then moved around inside the hull until I was happy that the fore/aft balance was where I wanted it and well within the loading capacity of the hull. In the static test the draft measured 40mm which would equate to a 20mm thick air cushion in the tunnel.

A flotation test was done to help locate the best place for heavy items such as batteries.