In Lilliana [Hull #21 begun in May 1977 and completed early in 1978] the flying bridge deck is 1" thick balsa core and the forecabin roof is 1/2" to 1/4" balsa core. The cabin sides are definitely 3/4" plywood.
Richard Packard 11/20/07
The design range on the W40 was to go about 2500 miles with 10% fuel remaining. My boat Lilliana burns 1.4 gal/hr at 6.2 knots. In addition to the usual 600 gallon tank, a previous owner installed a 55 gal "day tank" directly underneath the main tank. In normal weather this would take the boat from the west coast of the USA to Hawaii. That is considered the longest passage needed to go around the world. [ 07/27/18 ]