A monocoque that sails without heeling

[Vega]

What do you think of this boat?

http://www.voiliersansgite.fr/

[cyclops]

The sail crew is very lazy!

[safewalrus]

Calm ain't it? Whats it like in a blow? OK I can see the good points, but falling over is half the fun, isn't it? Few interesting stresses there in a bit of strong stuff I bet

[Vega]

Originally Posted by safewalrus

.....but falling over is half the fun, isn't it?

Yeah, I agree with you. Perhaps the system could be turned on just for cooking . (my boat heels easily to 30º and cooking is not easy)

About performance, a boat that sits upright in the water would not have less drag?

[cyclops]

Lorisail would love this " canting mast". How would they put foils on it?

[Tim B]

I can't tell without the sort of drawings they're not going to divulge, but it looks like they're using the mast to cant the keel (not such a bad idea in itself). Unfortunately, this means that the righting moment you would get from the hull is reduced to (or near) 0. Consequently, you can't carry as much sail. also the effect of canting the rig to leeward is not beneficial, there will be a small drop in power, but the basic moment is still rolling the boat over. Canting a rig to windward will increase power due to increased wind speed.

It is an interesting concept, but there is a lot on it that should be refined. firstly the hull-shape, then the keel-track.

Perhaps then it might be more feasable,

Tim B

[water addict]

whats the point of having the spar rotate with the keel? I don't get it.

[Vega]

Originally Posted by Tim B

...the righting moment you would get from the hull is reduced to (or near) 0. Consequently, you can't carry as much sail. also the effect of canting the rig to leeward is not beneficial, there will be a small drop in power, but the basic moment is still rolling the boat over. Canting a rig to windward will increase power due to increased wind speed.


Tim B

I would really like to take a good look at the stability curve of that boat.

Stability speaking, that boat works the opposite way of a normal sail boat. First you get stability from the ballast and then, when the keel reaches max. course movement, the boat starts to heel and then you will get form stability.

I agree that there is a lot of work to do and it looks like the guy that has invented the rig is not a sail specialist.

Now, if that movement of rotation worked mechanically on a double ring which drove the keel to the oposite side of the mast...that would be another story...

[cyclops]

OSHA has ruled that no one may move for or aft while canting.

[Jocko]

tspeer will probably know for sure, but won't the sail's thrust drop off as the square of the cosine of the mast's inclination? Doesn't that negate any advantage? Oh, and what would be the advantage of the inclined mast anyways?

[cyclops]

No bow watch is needed in fog.

[CT 249]

Not a very new idea either....in one of the "Ancient Interface" symposium papers there's a lecture about early sailing patents. One of the very first had the rig canting to leeward and the keel canting to windward, while the hull stayed level.

[cyclops]

I smell a job for a mini super computer and a bigger and stronger hydraulic ram, maybe 2, to gain complete control of mast and keel in all conditions.------------------------------- Where is Lorsail when we need him?

[gonzo]

There is a patent from the late 1800's on a rig like that. I saw it in an old issue of "The Rudder". I'll post it if I can find it. It was unsucsessful because it depowered too much and also the boat looses the stability the heeling force gives it.

[sailsmall]

Looks like a pretty nice concept to me. There are stability curves under the heading CARACTERISTIQUES I wonder what its like in swells and a breeze.