Let's carry over what we've learned from the part-built cat, as regards a sheet of laminated foam and bag of kebab-skewers. I've always thought that the cat was the most practical in operational terms in that it could stand on its own two feet... quite literally. Here though is a pattern for a single sheet that offsets the advantage when it comes to building a monoski.
What I've done is to cut the 1200 x 600mm in half, a portion of which goes toward the deck. The remainder is divided in half again between the keel seen here that will support the ski itself, and a pair of outriggers. Although I've cut these substantially on a diagonal, I have still left the forward end of each outrigger with a 5mm inset so that for one thing it is not unduly sharp, and for another so that it is easier to bind it to the deck as we shall see at a later stage.
I made a mistake by not running a squirt of adhesive between the underside of the keel and that of the deck, but we shall be able to rectify that prior adding a filet to the other side by easing it over to enable adhesive to be applied from underneath.
And anyway kids, what else would you want to do with a Sunday afternoon?
25mm foam sheets are available but not so commonly as the 20mm here.
