New small Multi from Icarus

Manfred, what is your 1st language? Those of you who speak multiple languages have an advantage when it comes to finding good information.

 

German, but my most important language is MULTIHULLS.

 

I can understand that. It is very contagious.

I spent a little over two years in Schweinfurt.

 

Hope you had a good time there.

 

Bernd has some new pictures on his Facebook page.
https://www.facebook.com/ikarus342000?fref=ts

 

It's a pity I don't do Facebook.

 

Not much new: troughs for the beams, daggerboard and a hatch for the cabin.

 

It's not that it is not efficient because it's not a normal sloop. It is inefficient in that, in that rig, the sail is only fully efficient on one tack due to the interference of the boom against the mast. I learned to sail on a Sunfish back in 1958, so I know this from personal experience.

 

OldSailer, I have never sailed a boat and never been around sail boats, so I'm asking because I don't know. I know the mast is vertical but I thought the boom was the horizontal part that swings around to keep the bottom of the sail stretched out. Is the part shown at an angle in the drawing of the complete boat also a boom? Can it go on either side of the mast? I can see in the picture that it would lay against the mast depending on the wind direction.

 

I raced a Sunfish last winter for the first time. It is noticeably slower on one tack than the other. The boat is fastest with more sail aft of the mast. But it is then harder to sail, especially in any wind. So most Sunfish sailors move the gooseneck fore/aft from say 16in-24in to help balance the boat.

A low aspect ratio sail is always less efficient to windward than a higher aspect sail

I suggest you compare the Laser and Sunfish. Both roughly the same with, length, sail area. Built by the same builder (in the US) and both have over 200,000 built.

Also check out the Super Sunfish which used the same hull but has a smaller, conventional bermudian rig. It is the faster boat

Richard Woods of Woods Designs

www.sailingcatamarans.om

 

It is going to be fascinating to see how this works out balance-wise, especially with the rig in the relatively unladen hull.

 

This has been done in a similar manner.
You might want to review this website: http://harryproa.com/

 

OK....the gooseneck... fore/aft to balance the boat... I think this might be why I have a 16 foot Lonestar aluminum boat with a 20hp outboard.

 

I do not think, that it is useful, to copy the sails from Sunfish or SuperSunfish. These fit for the famous Sunfish and have their special system of fittings which are in my opinion (unreasonalble) expensive -- besides of their merits.

http://www.sunfishdirect.com/store/index.php?route=product/category&path=3




Years ago, when I read of the extraordinary merits of the CrabClaw sail I started to build a boat to test such a sail and I made a model to develop a sheeting system to have the sail always leewards of the mast. I found a simple system with an endless sheet, an eyebolt at the bow and a cleat --or two.

May be Mr. Bernhard Köhler will devolop his own sheeting arrangement without reducing the performance of his sail design.

 

True but it isn't quite the same - at least with the harryproa things will be the same on each tack and the shunting maneuver doesn't need the bows or sterns to come through the wind. Seeing how this new arrangement tacks, gybes and balances will be very interesting especially as the layout allows for a useful mix of deck and cabin accommodation minimally affected by the rig and daggerboard.