Port tack faster than starboard tack, same point of sail? - Page 2 - SailNet Community

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  #11  
Old 08-28-2011
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Quote:
Originally Posted by jrd22 View Post
Unless I'm confused the OP said he has a list to port (more weight on port side) and he consistently sails faster on a starboard tack. If weight distribution was the cause you would think that the boat would be faster on port tack because it would sail flatter (as the OP said). I would suspect rigging tension but there are a lot of unknowns to explore.
It all depends on the boat. In light winds, the port list may help to lower the wetted surface area of the hull a bit on a starboard tack. At slow boat speeds (e.g., in light winds) wetted surface area has a disproportionately large effect on overall drag.
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  #12  
Old 08-28-2011
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Quote:
Originally Posted by jrd22 View Post
Unless I'm confused the OP said he has a list to port (more weight on port side) and he consistently sails faster on a starboard tack. If weight distribution was the cause you would think that the boat would be faster on port tack because it would sail flatter (as the OP said). I would suspect rigging tension but there are a lot of unknowns to explore.
John you are correct. I had a visualization problem. A port list would make a port tack faster.
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Old 08-28-2011
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Confusing because the thread title is the opposite?
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Old 08-28-2011
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Is the speedo paddle wheel on one side or the other? if so, this has been a reason for one tack being faster per say than the other. At least on "MY" boat it is! The paddle wheel is about 8" ff center to port, so many times since the wheel is deep and flat when on starboard tack, we are faster than on the port tack where the wheel will be pointing sideways for lack of better term or way to say it!

I list to port also a bit.

My rig is pretty well centered, as I had a crew up to the top, measured side to side a the top, upper then lower spreaders etc. tension is equal on both sides........

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Old 08-28-2011
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All I can say is, mine does this too. However, it changes from port to stbd on every other sail. On my boat, the gremlin is human........
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Old 08-28-2011
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jrd22: Huh, you're right, I set the topic wrong.

blt2ski: Wow, I never even thought of that. As a matter of fact, my speedo paddle wheel is on the starboard side. And two other through hulls too. Sheesh. *smacks forehead*
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Old 08-28-2011
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When you haul the boat this winter check keel + rudder + center of hull alignment.

You can either use a plumb bob and eyeball it or buy a new fangled laser levelers at a hardware store.
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More heel can lengthen the waterline, and influence hull speed. It would depend on the boat. For a full knot difference, a 30' waterline would have to become 34'. (Someone please check my math...) That's easy enough to test by moving rail meat around.

A roller furler has some asymmetry. Still guessing on the boat and rigging.
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Old 08-28-2011
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Quote:
Originally Posted by MikeWhy View Post
More heel can lengthen the waterline, and influence hull speed. It would depend on the boat. For a full knot difference, a 30' waterline would have to become 34'. (Someone please check my math...)
sqrt30 X 1.34 = 7.5 knots
sqrt34 X 1.34 = 7.8 knots

You would need at least a 40 waterline to get to 8.5 knots.
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Old 08-29-2011
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Quote:
Originally Posted by jjablonowski View Post
zAR,

You said it's noticeable when you're close-hauled.

Are the sails absolutely symmetrical? Like, does the jib have luff foam or luff rope on it? Could be disturbing wind at the leading edge.
Both my jib and genoa have protectors on one side, hrm.
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