racerx632 Posted May 11, 2020 Report Share Posted May 11, 2020 After I sewed the skin on my poco barta I shrank it with an iron. The skin tightened enough that the chine and gunwale bent inward in spots creating a concave shape between some frames. Anyone ever experience this? Is it possible to loosen the skin a bit? Quote Link to comment Share on other sites More sharing options...
even-keeled Posted May 11, 2020 Report Share Posted May 11, 2020 My Poco Barta has been on hold for a year and a half now due to raising a new child. The kayak is in the skinning phase though. My western red cedar is Home depot fence picket that started at 0.55" instead of 0.625". I'm using the economy fabric. The gunwale deflection shown here is from the tension of the double corded stitch alone. I figured it was because of the cedar thickness and I'd adjust to the new look. How much deflection are you getting? Quote Link to comment Share on other sites More sharing options...
racerx632 Posted May 11, 2020 Author Report Share Posted May 11, 2020 Same or a bit more then you I think. Seems to be in the same area as well. I also used the economy fabric. Quote Link to comment Share on other sites More sharing options...
racerx632 Posted May 11, 2020 Author Report Share Posted May 11, 2020 it is more pronounced here then this photo suggests. Quote Link to comment Share on other sites More sharing options...
even-keeled Posted May 11, 2020 Report Share Posted May 11, 2020 Some have experienced slight loosening with use. Maybe it's better to start a little too tight. Quote Link to comment Share on other sites More sharing options...
racerx632 Posted May 12, 2020 Author Report Share Posted May 12, 2020 We shall see. Quote Link to comment Share on other sites More sharing options...
andy00 Posted May 14, 2020 Report Share Posted May 14, 2020 Curious phenomenon. I was trying to imagine if that could have occurred on my Ravenswood and it seemed unlikely. So I looked at the plans for Poco Barca in "Fuselage Frame Boats" and see that distance between the #2 frame and the #3 frame (the area of the unfair curve) is 26 inches. On the Ravenswood, those two frames are only 18 inches apart. That difference certainly could contribute to the reverse curve. Of course, the species of wood used for the stringers, the characteristics of the particular pieces, and their scantlings could also be factors. As to performance, the curve of the gunwale probably doesn't mean much, but the curve of the chine could affect the hydrodynamics, but not necessarily in a negative way. We'd need some towing tank tests to sort it out. Fair winds Quote Link to comment Share on other sites More sharing options...
racerx632 Posted July 19, 2020 Author Report Share Posted July 19, 2020 I got in and did a close examination on the point I could reach. It looks like it is due to a small knot in the stringer. I’m building a long shot now. Once it’s finished I’ll remove the skin and make sure I use 100 percent clear wood. Quote Link to comment Share on other sites More sharing options...
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