Wood is beautiful material and it's a pity that design has not developed really since 50's. Location: French Guyana As in it was originally designed for the vendee, later changed for cruising as pictured. Location: Finland Thanks, very interesting, Patterson trimaran has something to it.
Location: Eustis, FL Edina, I hope by now your research has proven your previous comments, about wooden boats not being modern, a bit premature.
I remember a cover of WoodenBoat magazine a few years ago that had a VOR, Vendee, Open 60 or similar on the cover, you don't get more modern then these. I guess he doesn't know much about the aerodynamics of pickup trucks, with regard to tailgate open or closed.
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Location: Portugal Finally I was able to find the proper magazines and had time to scan the data on the Swan boats. I have suggested these two boats to you, because I believe that the Swan46 is a more seaworthy and stable boat than the swan 45 (even if this one is a very seaworthy one). The GZ curves of both boats are great, among the best in their categories, but the much superior displacement of the Swan 46 will give it a bigger RM curve. Originally Posted by Guillermo The FDS is calculated using the positive area under the righting arm curve, up to the Avs in this case (as Afl>Avs). This way, displacement is not considered and what enters the calculations instead is the Length of the boat.
Location: Pontevedra, Spain Thanks a lot for the curves, Paulo, although I thought we were talking about the 44 and the 45, not 45 and 46. As I told before, to calculate some of the STIX factors the stability curves input info are taken from the GZ curve, not the RM one.
As you correctly point out, it's surprising the so-called Dynamic Stability factor seems to take not into consideration the righting moments, as dynamic stability is related to the amount of energy available, thus the area under the righting moments curve.
I would like to add that Working Group 22 (STIX parent group) analized a list of Category 1 sailing boats models, known for not having had stability problems through their lives, and they developed a limiting RM-Loa data curve, so the symplistic FDS formula probably was derived from there or the like.

Location: Pontevedra, Spain At last a designer publicising the whole STIX factors! About those explanations about the FDS, I have my doubts, and if you compare the RM stability curves of the Swan 45 and 46 and compare them with the STIX of those boats, you are going to see what I mean. About the boats you have posted, the Huzar 30 seems to be a very nice boat, with an Impressive Gz curve.
About the AVS and the size of the boat I consider that the MCA guys have the right policies: Smaller the boat, the bigger should be the AVS (because small boats withstand more risk of capsizing than bigger boats).
And now, let's see her ratios and STIX based on those numbers (Measurements have been taken directly from the boat.
The basic problem to fulfill the A category requirements, from the hull forms point of view, is that the very narrow aft sections and relatively low freeboard of the hull (compared to modern ones) provide relatively little buoyancy when heeled, so the downflooding angle (to the upper corner of the companionway) remains low. From my point of view, the seakindliness should not only consider keeping low all six possible accelerations induced by the sea, as to increase comfort of the crew and avoid damage to the equipment, but also, and most important, the damping of rolling movements and the minimizing of broaching tendency, back from the design stage, which are vital for seaworthiness in rough seas.
Location: North Of Lake Ontario Excellent Document About page 20 of the document is data for the etap 21i.
To say which one is the definitive STIX for a boat, calculations have to be done for the Minimum Operating Condition (MOC) and Full Load Condition (FLC), at least, and choose the lowest of the two values.
Because of this kind of misleading info, some contradictory data and the lacking of a lot of basic info for many boats, I think this RYA list has to be taken with great care. Location: Pontevedra, Spain Another interesting comparison If you have a look at Contessa 32 and Etap 32S at RYA list, you'll find their STIX numbers as being 33 and 36. If we took from the Etap 32's STIX the effect of the 5 points given by its delta parameter (because of the floatation chambers I asume it has), figure comes down to a mere 30.7, so not reaching category A requirements.
On the flotability issue, I agree with you that floatation ability is an important safety one, but I would not use it to influence the STIX number in itself. Location: Portugal Most people would think that by buying a more voluminous and apparently heavier cruising boat will have a safer boat than the sleek cruiser-racer from the same manufacturer. Nothing wrong with classic though - it's by the way amazing how many people react negatively when I mention 'contemporary design wooden boat'.
So he is the ideal auctioneer for the pens & writing instruments auction, where there are plenty of interesting lots on offer. Fatta eccezione per questi oneri, non vi sono costi aggiuntivi, ne viene applicata IVA o altre imposte. Alcuni venditori possono offrire la possibilita di ritirare l'articolo direttamente previo accordo. Telefonando al numero internazionale saranno applicate le tariffe previste dal tuo gestore telefonico. Attenzione: se opti per un bonifico bancario manuale, il ripristino del permesso potrebbe richiedere fino a due giorni lavorativi, pertanto consigliamo di scegliere uno dei metodi di pagamento online disponibili nella schermata di pagamento.
If I am looking at it correctly this will benefit light boats and won?t take into account the role that displacement has in boat?s stability.

But then displacement is introduced separately, so the multiplying of this last times righting arm gives the RM. Its GZ curve is average and shows a significant inverted stability and a an AVS of only 117º, that I consider too low for a 30ft.
William Boag had a boat yard in Largs and between 1955 and 1965 he built 50+ Loch Longs yachts. If the boat would have somewhat wider sections and an slightly higher freeboard, as to provide a downflooding angle just over 100º, as well as a longer Lwl (shorter overhangs), it would have probably come to an STIX over 32, so fulfilling Category A requirements. The 33 value for Contessa 32 is not trustable enough (maybe it is not even 32) and the Etap 32S STIX is in fact 35.7 not 36, so an additional reason not to trust the RYA list. You can have a boat with a great stability but if you hit a container at full speed, unless you have a metal boat, or an insubmergible one, probably you will go down (of course, by the same criteria metal boats should benefit from the same criteria and I don?t think it is the case). I have said that referring the Bavaria Ocean line, comparing with the normal line of Bavarias, but here we have the same case with the Jeanneau 43 line.
This is done this way to calculate the FKR (knowdown recovery factor) and the Vaw (steady apparent widspeed to heel the vessel to Φd when carrying full sail) necessary to calculate the FWM (wind moment factor). I have said that I had data on the Swan 45 and 46, not on the 44, (that?s an older boat; see post 101) and the comparison that I had proposed was between the 45 and the 46, precisely because the 46 is a much heavier boat and surprisingly, has a smaller STIX than the 45. Its GZ curve is average and shows a significant inverted stability and a an AVS of only 117?, that I consider too low for a 30ft. There are still quite large fleets of these (you may search under Cove Sailing Club on the Clyde) and, strangely, the largest fleet down at Aldburgh in Suffolk (Thanks from here to my scottish friend Colin Whimster, who provided this info on the boatbuilder, as I've found nothing in internet). But you give the impression that most modern boats use that criteria for the STIX ( I mean that they are insubmergible) and that is not the case.
We can see that the cruiser-racer, the Sun-Fast has a better stability curve comparing with the cruising versions. I have a few that I'm offering too, one (RYD-14.6) in the gallery is being built locally, is about 120 pounds and modern in most regards. The difference in displacement is minimal and don’t have any real influence on the stability of the different versions. That's why probably it would be good, following Eliasson, to introduce a GZ area Ratio Factor measuring the relation among the positive and negative areas. He had a flourishing online pen business for years and later opened his own antiques and curio shop.

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