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Kayak Building Bulletin Board
S&G: Delftship panel shape development *LINK* *Pic*
Posted By: Dave Reekie
Date: Monday, 3 September 2007, at 4:35 a.m.
I referred to some particular behaviour I had seen with Delftship (was FREEship) panel shape development in a post earlier this week and was asked for more details. I've now got the right photo sorted, so here goes.
I designed the boat with a simple 4 panel hull. Then I added a totally flat deck in Delftship, to get it to give me the deck dimensions, so I could cut out a flat deck and turn it into a Point Bennett style peaked deck. However I got the following seemingly contradictory results in panel shapes developed.
- All panel shapes - side panels, bottom panels and deck panel - claimed to need the same iterations to produce: 5.
- The deck panel however seemed like it should have been fully developable as it was supposed to be entirely flat side to side and curved in one plane only.
- When I turned on the feature to use highlighting to show undevelopable edges I couldn't see anything highlighted.So I just cut out the panels and started. It became obvious that the sides and bottom pieces would not fit together: wiring the bottom pieces together and wiring the sides at stem and stern then offering them up showed a good match along the middle 70% of the hull where there was little twist in either, but at the ends there were gaping 'mouths' where they didn't meet. I had several stations in place so knew the basic shape was right. Setting up a line between top of stem and stern and measuring down to the stations showed that the side panels were basically correct: with the stations attached to the side panels in the right locations fore and aft they were at the right location vertically. So to make the bottom panels meet I had to significantly trim the panels along the keel line and add long thin V shaped extra pieces of wood along the chine. The linked blog describes this a bit more, and also contains the line drawings for the kayak and a picture (also enclosed below) of the panels where they didn't meet.
I've emailed this to the Delftship developer for info and will post and interesting replies.
Has anyone else seen this?
Dave.
Kayak building blog with more info
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