Hi John and all,
Two observations:
Going aground in mud and laying over and you bury that fin like a mushroom anchor and you are not going to be pulled off (without ripping the fin off- a very real possibility) till the tide rises.
Going aground on a relatively flat sand bank near high tide. If you neglect to pull the boat over when you can, the boat will stand on its keel wings until a not necessarily strong wind (or any imbalance) will topple the boat over. If this takes long enough so the tide is really far out, the boat may be damaged as it falls over and lands on its side on the hard.
My best, Dick Stevenson, s/v Alchemy
My CS 40 has a winged keel, and is good to windward, so your comments attracted attention! If I had the deep keel, fin draft would be 7 feet not 5.6 ft. I thought you glossed over or dismissed as a fashion statement any discussion of the hydrodynamics which are at the heart of the discussion. Thus, I am no wiser. The A2 design did not get around the rules, it complied, and won. Is this positive evidence?
Good tips regarding getting stuck..ie don’t. And to be objective, we caught a raft of kelp this year, and dinged a wing 5 years ago. My mistakes and who hasn’t?
Good point, that said, these are short thoughts, so not the place for a long dissertation, and I did point out that end plates were a great idea.
But I would stick with my thinking that, for example, the reverse leading edge angle is not a great idea given its ability to foul, and as far as I know, it has no performance benefits, so is more about fashion than function.
As to A2, she did indeed find a loop hole in the 12 meter rule to be faster in fact than the rule predicted her to be.
Hi John and all,
Two observations:
Going aground in mud and laying over and you bury that fin like a mushroom anchor and you are not going to be pulled off (without ripping the fin off- a very real possibility) till the tide rises.
Going aground on a relatively flat sand bank near high tide. If you neglect to pull the boat over when you can, the boat will stand on its keel wings until a not necessarily strong wind (or any imbalance) will topple the boat over. If this takes long enough so the tide is really far out, the boat may be damaged as it falls over and lands on its side on the hard.
My best, Dick Stevenson, s/v Alchemy
Hi Dick,
Both are very true dangers.
My CS 40 has a winged keel, and is good to windward, so your comments attracted attention! If I had the deep keel, fin draft would be 7 feet not 5.6 ft. I thought you glossed over or dismissed as a fashion statement any discussion of the hydrodynamics which are at the heart of the discussion. Thus, I am no wiser. The A2 design did not get around the rules, it complied, and won. Is this positive evidence?
Good tips regarding getting stuck..ie don’t. And to be objective, we caught a raft of kelp this year, and dinged a wing 5 years ago. My mistakes and who hasn’t?
Cheers
Hi Ian,
Good point, that said, these are short thoughts, so not the place for a long dissertation, and I did point out that end plates were a great idea.
But I would stick with my thinking that, for example, the reverse leading edge angle is not a great idea given its ability to foul, and as far as I know, it has no performance benefits, so is more about fashion than function.
As to A2, she did indeed find a loop hole in the 12 meter rule to be faster in fact than the rule predicted her to be.
Agree re reverse angle!