G'day DanTzn I modified the rules so what you see at the top of the page is the rules, you havn't missed anything the class was started on this forum and is still going please keep us up to date with your progress regards Jeff
Jeff Southall Current boats Nacra 5.8 1703 Cant have two Ram Raiders at the same time so not named yet Nacra 5.8 1667 Ram Raider Nacra 18 Square Taipan 5.7 134 Arrow 1576
Guys, while I'm on the topic - whats the consensus on rigs?
I was thinking of a two piece round section carbon mast with a pocket luff sail. Simple, light, pretty cheap and easily transportable. But that was until read the rules more closely and worked out that the sail had to be able to be lowered at sea. I couldn't figure out a way of getting the spreaders and stays onto the mast and being able to lower the sail.
I see that Vudu looks to have a pocket sail and spreaders & stays, so there must be a way.
I was thinking the simplicity of the rig would outweigh any performance gained from a wing section mast - and mean one less control line (mast rotation).
DanTnz visit Gato's website www.gust.ax to see the carbon masts we are doing for the DS12s. The drawings for the DS have the spanner tieing off to the tramp. The idea is to set it on the beach and then go sailing. This gives more adjustablity than the H16 style stops on the mast step but still simplifies sailing for kids. I suspect that as kids get a little older and more experianced the means to adjust will be added.
Re: Any Info?
#227139 01/20/1103:36 PM01/20/1103:36 PM
Guys, thanks for the info. My aim is to be able to car top, mainly because I have to take a ferry to get on and off the Island, so trailer or overhangs = more dollars.
In theory, could such a mast be made two piece? My ideal would be a slightly shorter version of the Weta mast.
Has anyone put any thought into an unstayed mast? I would have thought previously that it wouldn't be stiff enough for the righting moment of a cat - or to trap off. But the Devoti One is carrying 11m2 and a 15m2 kite with no stays and designed for heavyweight crews, so it could be a possibility. It would be great just to able to drop the mast in and go.
I started to make a mast in two pieces, but I did not complete it, I could still do it, I don't think there is a problem doing it. It will be a little heavier thats all. There has been talk about an unstayed mast, but so far not interest enough to do one.
Thanks, just found the earlier thread that included what I wanted to know om Wouter's proposal.
I'll have to put some more thought into that - hadn't factored in the effect a trapeze could have on sail shape on an unstayed mast.
I was told that the trapeze lines would be attached to tape reinforcements sewn to the sail sleeve. Use of the trapeze bends the mast to windward and back and this must be considered when making the sail.
I'm really attracted to a freestanding rig, I can't think of an elegant solution for the mast base. Wouter's solution would work fine but I think it would get in the way while sailing. Will have to get the calculator out for some other solutions. Countering the fore and aft loads seems to me to be the biggest problem.
I thought of a hollow drop in tube down thru the beam onto a dolphin striker. I ruled it out as I was trying to avoid having a dolphin striker at all. I also thought it would have to be really big to take the fore and aft loads without any additional fore and aft bracing - then the solution is to have a kind of diagonal dolphin striker. But then the design is getting more and complex and the idea of the freestanding mast was simplicity.
So now I am back to square one in my reasoning - a conventional stayed rig might be simpler all round. It may be better to think of rapid rigging systems.
I guess elegance is in the eye of the beholder. When us engineers get it right though with the balance of function and form, the general public tend to appreciate it, especially sailors.
The freestanding rig is going on the back burner for now unless I or someone else has some sort of brainwave. I suspect a standard rig with synthetic stays and trap wire would be almost as practical - shame to lose the ability to weathervane the rig though, confidence building for youngsters to be able to completely de-power the boat.
I found this boat while surfing around the internet. It is rotomolded and looks very similar to f12, except for having more metal than a Honda Civic, lol. You'll see what I mean when you see it. Has very similar sail plan and there may be bits and pieces that translate to f12 boats. Available in France and UK. Built in France where catamaran building is govmnt subsidized to create exports.