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Post by rdubs on Feb 11, 2019 21:07:39 GMT
Here’s another thing I don’t get. If you look at the polar tables it shows boat getting up to 14 knots or so. Yet, the hull speed based on waterline is 9 knots. Yes, it is possible to exceed hull speed but every knot gets more and more impossible to attain. Have any of you gotten your boats to do much better than hull speed?
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Post by Bora on Feb 11, 2019 21:09:40 GMT
I’ve had mine up to 11 knots with 2 reefs in in around 25 knots. Might have been a bit of surfing at the time as well.
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ChrisD
Junior Member
Posts: 12 
Jeanneau Model: SO 40
Home Port: Raby Bay
Country: Australia
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Post by ChrisD on Feb 11, 2019 21:43:58 GMT
Polars are always in true wind and angle they are theoretical
Check rig tension, how much sag does the forestay have in 12-15 knots, are the leeward shrouds loose when hard on the wind. (Racers will adjust rig tension based on the expected wind strength range)
What heel angle were you sailing at? How wide was the steering groove? how flat was the head sail? how much helm did you have? When were the gauges calibrated?
Were you adjusting the halyard tension on the jib while underway. (should be tight at around 12-15 knots some wrinkles as the halyards stretch ) The genoa car position is important to balance and power the headsail. As you have a shallow keel, a furling main and no moveable weight on the rail your pointing ability should, be less 5-  degrees. Sailing has so may little variables which have a huge effect on performance. Start with the basics in a systematic way and understand how they can effect things when adjusted. Buy a copy of Sail and Rig Tuning by Ivar Dedekam
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Post by tarn on Feb 11, 2019 22:48:12 GMT
Wow A lot of posts and plenty of advise Sailing close hauled is an interesting concept Watching tell tails is useful but if you can understand what’s happening then things will be clearer Moving the Genoa sheet car backwards and forwards will alter tension on the leech and foot of the sail This will allow wind to spill if the leechis loose The slot between the main and Genoa is crucial The sails should be at the same angle to the wind this allows faster air flow over the main Dont over sheet, the sails need to breathe. Mast bend Main sail outhaul Sail as flat as possible Lastly if you’ve a fin keel 35 degrees apparent is pretty good in a cruiser Enjoy Tarn
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Post by NZL50505 on Feb 11, 2019 23:59:49 GMT
I sail a 469 and I am very impressed with its performance. Others have sailed with me and near me and this boat surpasses most expectations. I don’t pay much attention to the polar predictions as they are based on skills and sails better than mine. I suspect most of the problem is just learning the boat and getting the feel of it. I find it points better when not overpowered. I reef a lot earlier than expected. Taking some sailing tips courses helps. Racing on someone else’s boat helps. Taking the sailmaker out for a day helps. And sailing a lot helps! I really suggest forgetting the polars and learn what feels right and confirm your seat of the pants feel by double checking what provides the best vmg on the gadgets.
Great advice. Polars are a form of marketing - I've never bothered to even look one up for any boat I've owned.
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Post by MartyB on Feb 12, 2019 0:37:57 GMT
Here’s another thing I don’t get. If you look at the polar tables it shows boat getting up to 14 knots or so. Yet, the hull speed based on waterline is 9 knots. Yes, it is possible to exceed hull speed but every knot gets more and more impossible to attain. Have any of you gotten your boats to do much better than hull speed? Some boats more than others can plane or surf going from a reach to a dead downwind run. So yes, one can go above hull speed if things are going correctly per say. I've been at 11.1 knots in my 2.45' 6.6 knot hull speed. full main, 110 out, 40 knot gust, and surfing a 3-5' wave! Marty |
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Post by alenka on Feb 12, 2019 18:53:17 GMT
I guess the most useful thing about polars is that if you hit the speed suggested, or you are close, then you can stop fiddling about with the sails!
Perhaps they should have another line which suggests when you are likely to spill the G&T!!
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Post by NZL50505 on Feb 13, 2019 0:39:16 GMT
Here’s another thing I don’t get. If you look at the polar tables it shows boat getting up to 14 knots or so. Yet, the hull speed based on waterline is 9 knots. Yes, it is possible to exceed hull speed but every knot gets more and more impossible to attain. Have any of you gotten your boats to do much better than hull speed?
In this clip from about 3 weeks ago I was sailing in my 42DS at around 10kts under main only in 30kts of breeze and building. I was coming to the end of a fast passage of 50nm in exactly 6hrs and whilst filming this short piece I hit 12.7kts. 30 mins later I was anchored up with a cold beer and the sun came out.
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degrees.
