Tech Committees comments on Swing Testing
8th April 2015 at 2:10pm #1245KenParticipant9th April 2015 at 3:55am #8213bradjohansonParticipant
Interresting refernce to only one alternate construction method, the double bottom plywood boat. What boats are double bottomed that they are referencing, the wood / foam / wood boats of a few years ago are double bottomed is there a newer version of that method?
USA-100 CAN-5009th April 2015 at 8:11am #8214FinnParticipant
There were some kit boats built in the last couple of years that had an additional layer of plywood laminated in the cockpit floor which falls foul of the rules regarding uniformity of construction thickness and density.9th April 2015 at 12:44pm #8215Bill BParticipant
The reference to double bootom boats is as Finn says, to do with the current kit boats which we would like to encourage. We just want to be right with any construction rules so that they can be built easily. If the findings of the testers are that the kit boats are coming out similar to the other boats, then it is easier to formulate construction rules. The old plans are drawn for boats with frames and stringers, but the new boats are being built with epoxy joints more like the old Mirror “stitch and glue”. There have been boats built like this before but it is right that there is proper guidance and we don’t want to have things outlawed that in reality should be allowed.
Bill9th April 2015 at 8:50pm #8216davecooperParticipant
I’m stunned that the technical committee think that a variation that is the equivalent of taking 2kg out of the middle of the boat and putting a kilo in each end is ‘trivial’ . I’m amazed (and a bit horrified) that it’s such a big effect.
Dave Cooper9th April 2015 at 9:39pm #8217FinnParticipant
Dave, I take it you have carefully calculated the exact position in the boat that you put your sandwiches in order to minimise the GR?10th April 2015 at 3:20pm #8218DaveBourneParticipant
2 kilo’s out of an all up weight of say, 170 kilo’s (mast, centreboard, rudder, helmsman) Sounds pretty trivial to me.12th April 2015 at 8:58am #8219Bob BourneParticipant
I hope I read that wrongly, ‘allowing double thickness ply in the cockpit’ – a complete break from previous rules re. hull thickness/density. Why?
How long before someone starts laminating teak / ply? – could you tell the difference if you drilled it?
We should stop giving people the opportunity to cheat (and explain to the thick sods why cheating is wrong).
Bob12th April 2015 at 3:37pm #8220DaveBourneParticipant
shut up!!!!!12th April 2015 at 4:53pm #8221Bob BourneParticipant
I’m done.12th April 2015 at 7:13pm #8222burtParticipant
a touching father son moment13th April 2015 at 6:08am #8223LaugeParticipant
The discussion you have here is exactly why we should go ahead with working on a swingtest for the OK as well. Doubble bottom or high density centerbox or 15 mm ply station two? All of these speculations would be irrelevant if a minimum gyration could be introduced to the class. There aren’t any reference to the “specialists” mentioned in the statement, nor any math to back up the conclusions. It pretty much only tells us that the author or authors of it, aren’t keen on having a gyration limit introduced to the class. I’m all with you Dave Cooper, cause one constructor went through a hell of a lot of effort to center the weight of the hull reaching the lowest gyration possible, and then afterwards “trivializing” the effect ? It’s like telling a competitor cyclist .. Naa go with the spoked wheels, the plated ones are overrated, or just use your normal helmet, the aerodynamic ones aren’t worth the effort! Keeping the surrounding hull light, and especially the ends, and sucking in as much weight in the middle is an advantage, and whatever we do to change mast weight or other stuff, the low gyration boats will still have an advantage
P.s. I always keep my water and food near the centerbox, same goes with the wet sponge and tow line
Pp.s Hellerup will run a new test this coming friday.
Happy sailing guys13th April 2015 at 7:52am #8224KenParticipant
Oh dear look what you started Bob , missed you at the weekend(inlands) hope the back gets better.13th April 2015 at 8:04am #8225robertParticipant
Jens, I am not wishing to pour salt into an open wound, but when you said: “one constructor went through a hell of a lot of effort to center the weight of the hull reaching the lowest gyration possible, and then afterwards “trivializing” the effect ?”, you are openly accusing a boatbuilder (which you don’t name) of cheating. Not cool.13th April 2015 at 8:16am #8226GregParticipant
I am not sure that the danish boatbuilder who achieved this using steel wants to be reminded of it. I just hope it is replaced in the original spot for the swing test this weekend. And then of course removed and whatever is done to properly remedy it is recorded and approved by the International Measurer.
I am sure this must be what Jens is talking about as that boat is obviously the most suspicious one around.
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