masa66
Junior Member
Posts: 18
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Post by masa66 on Sept 21, 2019 22:25:54 GMT
Hi, on my SO35 I have a big difference sailing upwind between port tack and starboard tack. With starboard tack I lose more than one knot ... the mast is straight and I don't find any improvement with weights. The boat at rest is slightly skidding on the water on the left ... do you have any suggestions? It seems a common problem for so35. Thank you Mauro
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Post by Don Reaves on Sept 21, 2019 23:53:46 GMT
I don't know if it's a common problem with the SO35, but my 2004 model behaves similar to yours. I have checked, and the mast seems to be centered properly side-to-side. The rigging tension is the same on both sides. The mast is straight, with a slight bend to leeward above the upper spreaders when beating, which I believe is what you would expect.
I haven't put much effort into moving the weight around on the boat. At dock, water tends to collect more on the port side of the cockpit, so I assume it's leaning to port slightly.
I other words, I can't offer help for your problem, and would also like to hear suggestions from other forum members.
Don
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Post by shortarseyoda on Sept 22, 2019 12:13:20 GMT
Yeah my SO35 has the same problem. In my case the keel hasn't been bolted on square. To get round the static heel that causes, a number of heavy weights are bolted on the starboard side at the top of the seat back stowages. Dynamic stability suffers and the result of the bodged work around means that it sails a lot better on a Starboard tack than a port. The people who make these boats are a bunch of goons and I'll never buy another Jeanneau. They should be ashamed tbh, even at their bottom end price point.
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Post by alenka on Sept 22, 2019 12:55:56 GMT
Silly question maybe...
Are you reading speed from GPS or the paddle wheel? If the latter then it could be just the position of the sensor.
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Post by Don Reaves on Sept 22, 2019 16:31:00 GMT
I can see the speed difference on both the knotmeter and the GPS. I have wondered whether the problem might be related to a misaligned wind instrument, which would have you comparing speed on tacks with different apparent wind angles. However, alignment adjustments haven’t helped.
Don
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Post by puravida35 on Sept 22, 2019 22:56:55 GMT
My previous boat was a SO35. Loved the boat, but it had same issue. Slight speed difference on one tack and it just felt better on one tack. Did all the normal rig checking, found nothing out of the ordinary.
Not sure if it’s related, but I removed the emergency tiller cover to test the backup tiller. I noticed that the top of the rudder post was not directly under the center of the deck opening. Was slightly offset to one side. I could easily measure the placement of the hole and confirmed the opening was centered relative to topsides. This left me with the idea that the rudder assembly was offset... possibly the hull mold out of alignment? If true, an offset in the rudder placement or a molded in twist in the hull could explain the behavior difference between tacks. When out of the water, the rudder seemed straight or vertical but I never thought to see if the rudder was exactly aligned with the keel or if the hull seemed misshapen.
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Post by alenka on Sept 23, 2019 8:20:11 GMT
My former boat a Hunter Legend used to do the same - But no GPS speed onboard to confirm. I was told it was probably mistuned rigging allowing the mast to twist on one of the tacks.
Good Luck - It must be very frustrating.
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Post by alenka on Sept 23, 2019 8:36:18 GMT
As an aside I had heard that one yacht manufacturer used to sell the boats that came out of the mould faulty at a cheaper price to charter companies rather than private buyers paying top whack
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Post by panoramix on Sept 23, 2019 8:40:46 GMT
When the genoa is partly unfurled, the furling direction of the genoa makes a difference whether is furls clockwise or counterclockwise. And when the genoa was fully unfurled on one side, it might not be fully unfurled on the other side if the reefing line is kept tight.
If the main is furled then you will notice that the unfurl opening is not centered on the mast.
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masa66
Junior Member
Posts: 18
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Post by masa66 on Sept 23, 2019 20:18:28 GMT
I thought, to compensate partially, to move the head of the mast a little to the right ... crazy idea?
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Post by shortarseyoda on Sept 24, 2019 8:01:47 GMT
My previous boat was a SO35. Loved the boat, but it had same issue. Slight speed difference on one tack and it just felt better on one tack. Did all the normal rig checking, found nothing out of the ordinary. Not sure if it’s related, but I removed the emergency tiller cover to test the backup tiller. I noticed that the top of the rudder post was not directly under the center of the deck opening. Was slightly offset to one side. I could easily measure the placement of the hole and confirmed the opening was centered relative to topsides. This left me with the idea that the rudder assembly was offset... possibly the hull mold out of alignment? If true, an offset in the rudder placement or a molded in twist in the hull could explain the behavior difference between tacks. When out of the water, the rudder seemed straight or vertical but I never thought to see if the rudder was exactly aligned with the keel or if the hull seemed misshapen.
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Post by shortarseyoda on Sept 24, 2019 8:04:32 GMT
The rudder could be offset to allow the propshaft to be removed. Unlikely as they normally offset the propshaft but possible I guess.
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Post by zaphod on Oct 3, 2019 19:46:30 GMT
Hi, on my SO35 I have a big difference sailing upwind between port tack and starboard tack. With starboard tack I lose more than one knot ... the mast is straight and I don't find any improvement with weights. The boat at rest is slightly skidding on the water on the left ... do you have any suggestions? It seems a common problem for so35. Thank you Mauro Over a knot is significant. I'm not sure what you mean by "slightly skidding on the water"? If the weight distribution is not balanced and the boat has a list to one side when at rest, that could account for some of it. Heel angle makes a big difference to boatspeed. If you are heeling more on one tack than the other, that could account for the speed difference. If you have to depower on one tack more than the other to maintain the same heel angle, that will also make a difference. Do the SO35s have tankage or batteries on one side rather than on centerline that might cause them to have more ballast on one tack than the other?
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