Backstay problem on Gunter rig

[heavyweather]

Are you still working in your folding boat? I am attempting a very similar build but some of my ideas are different. Get in contact if you are interested.

 

[laukejas]

Hi heavyweather, I've been working hard on it, but right now, I'm on holiday, and don't have regular access to the internet, and laptop with my project is at home. I'll be back on 26th of July. Please, send me a reminder PM then, and I'll gladly share and discuss all I have. I'm also very interested in your ideas.

 

[Skyak]

Are you still working in your folding boat? I am attempting a very similar build but some of my ideas are different. Get in contact if you are interested.

Heavy,
until laukejas gets back you might look at this thread.

http://www.boatdesign.net/forums/sa...hting-moment-versus-heeling-moment-50423.html

The thread you replied to is older. The link above is the continuation of the effort with some very practical improvements.

Laukejas, I have not forgotten about you. I saw some concave bottom sections on the last pictures you posted -it needs to be all convex, I struggled with how to tell you. About rocker, it's not a simple amount, it's a design process.

Since then I have found a spreadsheet attempt at VPP for dingys. I just got it with the warning it was not complete and I don't fully understand how it works but it would have taken me a year to get as far as it is now and I have the ear of the developer.

Enjoy your holiday and be careful, they are shooting down airliners in your part of the globe.

 

[heavyweather]

Brilliant bit of lateral thinking there. Maybe he's going to fill it with helium.

Rubbish. Yost's SOF kayaks, as well as kayaks and other SOF boats made by other builders, often have rocker in the keel line. To take one obvious example, look at Dave Gentry's Ruth.


No, the original Laser hull is not developable. The Deftship panel expansion tool will be fooled by some shapes. It will try to expand shapes that aren't even remotely developable. You have to use it with a bit of common sense.

Check the hull in perspective view and "developability check" mode. That will show the hull in red and green. Green areas can be developed, red areas cannot. If everything except for the chine lines is green, split the hull into seperate layers (one for each flat panel), and set those layers as developable in the layers dialog. THEN you can expand them to see their true shape.


Fabric is not paper. Fabric will stretch on the bias, so is far more forgiving of the sorts of shapes usually found in boats. Most SOF boats can be skinned without needing darts cut in the fabirc.

All true but I have my doubts that PVC bond to fabric will stretch like Polyester or Nylon fabric.

I did build Dave's Shenandoah Whitehall, a SOF Mippet (Bolger - Small Boats)...like Dave (he is my hero), one of Yosts Seakayaks, a 2m SOF canoe and a SOF pram based on the Eastport Pram (including a Mirage Drive)...we started a Fliptail 7 at school last semester.

I also need a Faltjolle now.

The best hull in my opinion would be a skegless flat bottom skiff like the GIS or Summer Breeze.
Some Bolger hulls could work also. The Teal and if you are really going big the Windsprint double ender.
Probably most plywood designs would work. I also considered the "Gypsy", Mixer, Spike/Pike, Ladybug, Junebug and some of Radosław Werszko's (free) designs from http://www.dinghy.pl/ .
I ended up with the Mayfly 14 which I am working on now.
I left the submerged part of the hull untampered, cut down the bow ~20cm to get a pretty flat sheer line. I also tilted the transom for easier ruder mount and changed the leerboards to centerboard/daggerboard. The reason for that is that I am striving for a rigid bottom-mast-centerboard while everything over waterline will be light. Off-centre mounted boards like on the Teal also seem like an interesting option.
For the hull I am going with welded/glued PVC panels like Tom Yost does. The hull is 3 parts only (transom and bottom 1 panel.) with untwisted sides that run the whole chine in an fixed angle. A sleeve for the daggerboard is also needed.

I love all the Russian boats...I only found the MEWA (not Russian, I know) so far. Most other pages on Faltjollen are German anyway.

I have to go now working out some things. I am planing on finishing in spring 2015.
I might give up but some day though...but the fun will be quite worth the 300€ or so...I figure I can always buy some used Faltjolle. I like the Hart Capri and 800€ is still cheaper than the Nautiraid s300.
It is a little sad though that there is no modern folding sailing dinghy available.