As part of my attempt to learn how to use a 3D CAD program, I have been using my Three Brothers powerboat design as an exercise. Although the design is still under development, I thought that some people may be interested in seeing a stage-by-stage stitch-and-glue assembly sequence.
This assembly sequence is only one of several approaches to stitch-and-glue construction, but most have a common theme of not requiring a strongback or mould set-up. The shape of the boat is determined by the accurate design, marking-out, and cutting-out of the primary parts - if everything is done correctly, the boat assumes the correct three-dimensional shape without a strongback and set of station moulds, greatly increasing the speed of construction.
|Three of the six main panels cut from plywood and laid on the floor. The accuracy of the design and cutting of such panels is the key to a successful build.|
|Pre-fabricated bulkheads, frames, and transom are positioned on station marks and loosely sewn into location using cable ties.|
|Topside panels stitched into position. By this stage the glass-taping of joints will be taking place.|
|Cabin sides, including coamings, stitched into place.|
|Longitudinal webs glued and taped into position. Ventilation holes are suggestive only, and may be changed depending on style of emergency flotation employed|
|Outboard motor splash-well structure added.|
|Floorboards and other horizontal panels introduced.|
|Longitudinal deck-beams and roof structure in place.|
|Fore-deck and aft-deck panels attached.|
|Plywood cabin roof and front panel of cabin attached.|
|Gunwales, outer stem, and structural trim around cabin and coaming finish the basic job.|
This is a very quick illustration of the basic assembly method. For more detail, I suggest reading Sam Devlin's wonderful book on the subject, "Devlin's Boatbuilding.