Paulo, are you still working on the answer to the static curve question? (chuckle)
Oh Paulo , how are you doing with the curves ??
I have a few more names by the way :…….
Now jeff, don't get in a puff, Paulo and you are all big guys now.
It has now become apparent to me that you do not know how to interpret the static curves, I am concluding you have it totally backwards.
re: post #28, to allow me to understand your thinking , could you evaluate the differences between the Hanse 430 and the 36 foot Bavaria? just those two. OK?
Well, I would not have the trouble to analyze a stability curve for you (after all I am still waiting for the Ericsson 46 stability curve that you have said you were going to post, three weeks ago), but since I have done that already more than two years ago, and it can be interesting information to the forum, I will post it.Not only are you not technical and obviously can't properly interpret a static curve, you attempt to school me and quite frankly
you sound like you have not gotten beyond a sales brochure.
Of course, you have to remember that I am polite and I was on that forum (their forum) looking for information about the Hanse 430. The last thing I wanted was to be rude, or to say bad things about their boats, so I was “gentle” in a way I addressed the Hanse 430 stability. I have to say that I have also some doubts about that stability curve, but that is another story.
“I am not saying that the boat has not a good potential for speed (much more than the Oceanis) I was saying only that the Hanse 430 has an unusually big inverted stability and I am not saying that based on almost meaningless data but on the stability curves provided by the manufacturers, the ones that are used for certifying the boat.
Those curves are pretty close to reality and if there is some difference is for worse, because they don’t take into account the weight of the furling sails and radar.
The ones I am posting are RM curves (moments), they are in T/m and all boats are in maximum charge condition, except the Bavaria 36 that is on minimum sailing charge condition.
I have made this graphic for making a personal evaluation of the Hanse 430 stability compared with some of the boats I am considering. I didn’t consider the Oceanis 43 because I prefer the other two and because it would give me more work, but the Oceanis 43 stability curve is not very different than the one from the Jeanneau 42.
I have considered the RM 1200, the Jeanneau 42 and the Hanse 430. The Bavaria 36 serves as a measure in what regards inverted stability.
The overall best curve is the one from RM 1200. It is only a 40ft and the lighter of the three boats (7,8T against the Hanse’s 10,4T) but it manages to have only less 4% of the Hanse’s positive stability and 93% less negative stability. The negative stability of the Jeanneau is similar to the RM’s.
The Jeanneau and the RM have not a particularly good inverted stability (they are too stable for my taste), I would say they are slightly below average, they cannot compare with the inverted stability of a Malo 43, a Finngulf 41 , a Wauquiez 45 or a J 133. Comparing with the data I have seen about the issue, I would say that while the last ones would right themselves up (giving a sea condition capable of rolling them) in about 30 s the Jeanneau and RM would need an average time between 1 and three minutes.
For the Hanse 430…the energy needed to overcome that huge inverted stability is bigger than the one needed to invert the Bavaria 36 (1,2 X). The Bavaria 36 is a class A boat and that means that it can stand 7m waves. There are several that circumnavigated and several that have been caught in storms without being rolled.
Of course, for inverting the Hanse 430 (from a 0º heel position) you need two times more energy than the one needed to roll the Bavaria 36, but that is not true if the boat suffers a broach and comes to 90º of heel.
If both boats are at 90º of heel you need more energy to invert the Bavaria, comparing with the one needed to invert the Hanse. That’s why I was saying that you should take a lot of care if you decide to carry a lot of sail in bad weather (racing).
I could have said nothing. I have already taken away my doubts but I believe that sailors should know how their boats behave even on those situations that almost never happen. If you know your boat you know how to act, even in extreme conditions…and after all the Hanse 430 has also a big positive stability…just keep it upright if there are waves.”
myHanse - Hanse Yachts Owners Forum: Polar diagram for 430 ?