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| Main Sheet Pumping http://www.hobie.com/au/en/forums/viewtopic.php?f=14&t=13659 |
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| Author: | getwetsailing [ Tue Aug 11, 2009 9:49 am ] |
| Post subject: | Main Sheet Pumping |
I was watching a few youtube videos, and was wondering why they pump the main sheet? Does it do anything, and does it help you go faster? |
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| Author: | J_Eaton [ Tue Aug 11, 2009 11:46 am ] |
| Post subject: | Re: Main Sheet Pumping |
Proper upwind sailing fast will be with the windward hull barely touching the top of the water. If you prefer, when sailing a specific heading, as the wind gust comes, ease off the main sheet, and sheet back in when gust is gone, hence main sheet pumping, or "sawing" the main. Some prefer steering to compensate for the gusts and leave the main sheet in the same position. Still others will use a combination of both, in smaller increments, to keep the boat at a maintained degree of heel. |
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| Author: | Tom Machette [ Wed Aug 12, 2009 11:16 am ] |
| Post subject: | Re: Main Sheet Pumping |
Some people pump the main while on the trap/flying a hull to dump any stalled air that is caught in the main sail. |
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| Author: | sgtpepperoni00 [ Wed Aug 12, 2009 1:53 pm ] |
| Post subject: | Re: Main Sheet Pumping |
Tom Machette wrote: Some people pump the main while on the trap/flying a hull to dump any stalled air that is caught in the main sail. what does that mean: "stalled air that is caught in the main sail." ??? |
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| Author: | mmiller [ Wed Aug 12, 2009 2:08 pm ] |
| Post subject: | Re: Main Sheet Pumping |
The slow sawing of the sheets is not what I would call "pumping". Pumping would be quick in and out action to promote forward motion. Typically used in lighter winds by windsurfers and small dinghies. |
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| Author: | yoh [ Fri Aug 14, 2009 4:30 am ] |
| Post subject: | Re: Main Sheet Pumping |
I agree, I pump my larger windsurfing rigs in light air. The purpose here is to move from displacement to hydo planing speeds in marginal conditions - something that does not play a role sailing a Hobie 16. It also reqires a lot of rig twist and reflex to be effective - again something that is not really a feature of a Hobie 16. What is more, it is physically demanding with a 10m* sail - now try this with a 20m* sail of a hobie. I think what you see in those videos is someone compensating the main for gusts. Considering the ration of 6:1 or 8:1 main sheet blocks and the amount of line that needs to run through to cause a change of 1 * in the sail... Patrick |
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