When you launch a new kayak, it is with mixed feelings. First, the happiness of seeing it hopefully works much like thought, and the relief of being finished with a pretty intense project - but also with a certain sadness ..
I know how satisfied I may be once it's done and how difficult the journey than have been, so after a while begins to satiety creep back again. It's kind of fun to be on the road than to arrive. If I ever were to build another one so maybe you could do this instead .. a little slimmer, a little faster .. A little better ..?
Now it seems that there might be a project and I thought to show how I go about when I design my boats. As usual, not the fastest way maybe ..
First, one must of course have some idea about what you like and what features are most important, and feel free to try other kayaks also to broaden the frame of reference. Since I will keep my last kayak tour paddling / camping, I can go the whole hog with this some more.
I would primarily have more speed, combined with a certain seaworthiness / rollbarhet .. - That a rudder kayak to train / compete on flat water and reasonable havssjö.
I always start my last model and sketches loosely on the longitudinal profile. The dimensions are not as important but for most to find some kind of line of it all. The waterline is increased and a rudder requires eg a different keel line to work against.
Somewhat later ..
Gradually it begins to settle, and even if nothing is fixed yet, you can switch to transverse & spantprofil. Here, too, I take the help of my old drawings as reference.
This time there was little pyssligare because I wanted to increase the number of frames. Have always run with 12 frames earlier but 13 steps at 580 gives almost 45 cm between each pillar - difficult with a 5 mm strip and almost impossible with 4 mm. With 20 stages (19 frames) will be down in 29 cm apart, which gives much greater precision and better able to control the shape around the cockpit, etc.
I do the whole drawing in Illustrator, mainly because I use it everyday and I work pretty DEFT in it. It is not a CAD / CAM, but a 2D vector program so it will be a lot of measuring / adjusting. Even if you work in the computer, it will be a lot of work said P.
It's probably much easier in a dedicated special but I do not know if the results are always better ..
When it starts to sue I check the routes in BearboatPro - a shareware program that also works on mac. It's pretty primitive and I do not draw in it, but to check balance, volume, distribution and so it works fine.
Adjustment possibilities are quite limited but in the end you can usually get a model with reasonable similarity .. I pasted it together with my drawing to reconcile.
The main figures for me are: LCB - Longitudinal Center of Buoyancy - that was the balance lies, LCF - Longitudinal center of flotation - was buoyancy lies, and CLA - center of lateral area - balance sideways, as you can adjust with a skeg for example .
There are a lot of other variables, but first, I do not think they fit properly, the PC value, for example, and not so important, like wet surface, which of course is primarily dependent on the displacement.
Here, I wanted to have a sharper bow and greater buoyancy in the stern to climb a bit on the bow wave without digging too much.
After much tuning, pill back and forth and kontrollmätande it starts to resemble something out. I save each version when I go on to be able to see the steps in the development, and sometimes when things have inspired a little bit you can see them in a different light.
How does it look like - right now anyway .. A combined training / Racing for smooth water and havssjö. The measurements ended up at 580 x 48 cm (which can, within reason, be amended along the way ..) and the rudder was underlying. Probably some sort of lightweight shutters but otherwise I'll try to get the weight down as much as possible. Cockpit and pedal / steering stick is not clear yet.
With luck I can get started building sometime in December, get in the water in early spring and time to run into me before the summer. And I have signed up for DKM + 2008 ..
To be continued ..