Absolutely! That song, that album, that band is part of what made me who I am.
- Will (Dragonfly)
I Love to Eat Crab Claws - Here's Another Reason to Love them
- Thread starter Will Gilmore
- Start date
- Will (Dragonfly)
Second that. The only band I was ever really a "fan" of. So many poignant memories attached now.
Another great feature of the crab claw, the simplicity and ease of working.
Moving right along:
-Will (Dragonfly)
Moving right along:
-Will (Dragonfly)
This is a fantastic Website about rigging a crab claw: http://econscience.org/tiki/2016/05/04/crab-claw-sails-the-mast-to-tack-connection/
Here, the author discusses the advantages of connecting the tack at the base/aft of the mast
instead of, like the sailfish, to one side with the tack forward.
While there are other answers to the problem of interrupted airflow by a mast deforming the sail on one tack or the other, the aft tack connection is a simple solution.
This next site is a brief analysis of some wind tunnel tests done with the crab claw sail. The change in orientation (angle) of the sail's line of symmetry as well as the hauling of the boom to the boat's centerline, makes for more versatile trim options in various winds and points of sail. http://econscience.org/tiki/2016/05/12/bernard-slotbooms-windtunnel-tests-of-the-crab-claw-sail/
-Will (Dragonfly)
Here, the author discusses the advantages of connecting the tack at the base/aft of the mast
While there are other answers to the problem of interrupted airflow by a mast deforming the sail on one tack or the other, the aft tack connection is a simple solution.
This next site is a brief analysis of some wind tunnel tests done with the crab claw sail. The change in orientation (angle) of the sail's line of symmetry as well as the hauling of the boom to the boat's centerline, makes for more versatile trim options in various winds and points of sail. http://econscience.org/tiki/2016/05/12/bernard-slotbooms-windtunnel-tests-of-the-crab-claw-sail/
-Will (Dragonfly)
Check out this tacking process to reverse direction.
-Will (Dragonfly)
-Will (Dragonfly)
Amazing!@rgranger,
I just came across this picture while looking up something completely unrelated. Thought you would appreciate it most of all.
Not a crab claw rig, but you described a version of this, I think.
- Will (Dragonfly)
Thanks,
That was a nice video. I could not see the steering oar so I was confused as to how he was steering the boat.
No. I don't see that. Did you see him tack around the buoy? He changes directions by moving the tack from one end to the other. Sail is on the leeward side the whole time.
-Will (Dragonfly)
jssailem
SBO Weather and Forecasting Forum Jim & John
- Oct 22, 2014
- 22,821
What I saw, he did not really tack around the bouy. He went beyond it then moved the sail and went in the opposite direction over the top of the bouy. The sail moves along one side of the boat. From bow to stern. Wind stays on the same side of the boat. The stern now becomes the bow and he heads back in the direction he came from. Not sure of his method for steering his craft but guess it is a paddle. The sail stays attached to one side. Appears stable. Suspect it is a mono hull with an ama.
The hull looks a look like a Mad River canoe, to me.
And yes, he never turned through the wind. Just switched bow and stern.
"Hand me my jacket, I left it in the stern. Hey! How'd it get to the bow?"
He did run over the buoy, didn't he?
-Will (Dragonfly)
I can't see any steering paddle, oar or rudder. You don't suppose he steers with weight and sail trim?
-Will (Dragonfly)
-Will (Dragonfly)
This type of tacking is called shunting... but look again. The sail is in front of the mast and to the windward side of the mast. On most proas the crab claw sail is behind the mast (on the leeward side of the mast). I have several books on proa designs and have purchased the plans to one called the wa'apa. It looks like it would be a tone of fun to sail. My daughter and I also built a strip planked canoe two summers ago... so I have it in the back of my mind to build a working proa someday. Just need time and space. Right now I have no time...
I'm afraid I don't see that at all.
It looks to me like the mast is stepped midship or even on the pontoon side of the canoe-like hull. The tack of the sail is fast to the bow, ahead of the mast in relationship to the boat. However, the sail's camber curves out on the leeward side of the mast. No part of the sail is too windward, that I see. Are you using different reference points? Maybe we are not talking about the same thing. The wind is coming across the pontoon before meeting the sail.
-Will (Dragonfly)
jssailem
SBO Weather and Forecasting Forum Jim & John
- Oct 22, 2014
- 22,821
@rgranger I can see how you might reach that conclusion. I think it is an illusion based not he way the light is hitting the sail. Look not at the sail but at the water. The camera is positioned so that the boat is upwind of the camera (look at the waves). And is therefore reaching left and right in front of the camera. This puts the sail down wind from the Mast (which is hidden behind the sail).
Not sure how close tot he wind this boat can sail. It looks pretty good at 90 degrees to the wind and down wind, but It appear to be weak at sailing up wind. Perhaps the skipper would need to wait until the wind was going in a favorable direction before venturing out on the water. It does look like fund.
Not sure how close tot he wind this boat can sail. It looks pretty good at 90 degrees to the wind and down wind, but It appear to be weak at sailing up wind. Perhaps the skipper would need to wait until the wind was going in a favorable direction before venturing out on the water. It does look like fund.
I just saw this on Craigslist while looking at small sailing dinghies that I might use as a tender.
$12000 gets it for you.
https://maine.craigslist.org/boa/d/portland-wooden-liveaboard-junk/6758733678.html
-Will (Dragonfly)