Nautical Research Journal 13


5. Pontoon hoops laid up on formers. 7. Pontoon hoops centered on jig.


6. Pontoon hoops paired off with matching supports.


preparation for the last two stringers. Based on photographic evidence I decided to make the top and bottom strings 2 millimeters by 3 millimeters with the 2-millimeter side meeting the hoops. T e side stringers are 1.5 millimeters by 3 millimeters with the 3-millimeter side meeting the hoops. T e thin Costello boxwood strips easily bent to the desired shape and a lot of clamps got used to keep them in place as the glue cured. At this point, the stringers are excessively long fore-and-aſt ; they would be shortened later in the build. (Figure 8)


Aſt er the four stringers were attached, but before the solid former disks were removed, I drilled holes through the stringers and hoops at locations attachment bolts would have been, as well as locations where the cross-wires would intersect the hoops.


T e next process was to cut out the alignment dowel 8. Longitudinal stringers being added.


and the hoop forms. T e dowel was cut in multiple places and removed in segments. Other than being careful not to cut a stringer by mistake, the work was straightforward. T e formers had been waxed before the hoops had been laid, nevertheless only two disks came out whole. T e remaining disks needed to be cut into several sectors and were removed in pieces. I felt fortunate that no damage was done to hoops nor stringers. To represent the bolts, I used 22-gauge copper wire and to represent the cross-wires, 0.015- inch piano wire was used. (Figure 9)


To fi nish the main pontoon, the front and back ends of the stringers were trimmed to their proper lengths and tips were fashioned. (Figure 10) T e two nacelles were fabricated in an analogous fashion.


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