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Post by buscari on May 16, 2015 21:32:22 GMT
Hello everybody, I am owner of a SO 40 in spain. I have optimized and improved boat for Races, but I wonder if I can change the hydrodynamic shape of the keel without changing the keel, anyone knows how? has someone done this before? I would like to recibe any advice. has someone modified the bulb and profile, and the leading edge or outflow. Greetings thanks
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Post by Don Reaves on May 16, 2015 22:02:57 GMT
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Post by so36idavid on May 17, 2015 4:18:29 GMT
You can of course do all kinds of things to your keel but there are some risks. You need to understand the loads that the keel bolts and sump can take as well as how the rig will respond to a stiffer boat. I recommend that you chat with a naval architect about the loads. Also, before you do anything you should probably talk to whoever is going to rate your boat so that you understand how the mods will affect your rating. It's entirely possible that you'll land up with a faster boat but will finish worse because of the rating hit.
David
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Post by MartyB on May 17, 2015 18:23:41 GMT
You can start the key to an optimum shape, get better pointing etc out of the boat with out a rating hit.
If you race irc, if you add weight to the keel, make it deeper etc, you can improve performance. But because you added weight to the keel, that system gives you credit for the additional weight, so you may be able to keep the rating by equal, but improve performance.
There are what of doing things.
Marty
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Post by davideso37 on May 28, 2015 10:29:25 GMT
Hi,
I am still happy with the wings we fitted to our SO37 and on the right day we can beat the Sunfast 37 and SO 379.
I did add three extra keel floors and two extra keel bolts but these were to improve the safety factor for the standard keel and avoid any frame delamination problems. The three extra floors are full size similar to the main one in the SO37 so we have heaps of reserve safety factor. It was a bit of a job drilling and tapping the new keel bolts 75 mm into the cast iron keel but with perseverance we did it in a day.
If I had my preference for racing I would get a naval architect to design a new keel of 2.45 metres depth and only 1700 kg weight so we could get the same righting moment as the Sun Fast 37 but with 360 kg less weight. Of course this restricts your cruising range in many parts of the world but not on Sydney Harbour. The big problem with this concept is getting a match to the long keel base of the existing yacht. The keel on the SO379 looks to have done this rather well but it is still too short for my racing preference.
Regards
David
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