25-06-2010, 18:01
(Questo messaggio è stato modificato l'ultima volta il: 25-06-2010, 18:15 da sniper.)
il mondo è bello perchè è . ognuno ha le sue idee
io mi riferisco ad una tecnica (ben nota ai derivisti) ma che si applica anche a barche più grandi (specie senza belin) che si chiama vang sheeting
vi allego qualche informazione (purtroppo in inglese)
Vang Sheeting
Vang Sheeting is an alternative mainsail trimming method.
Conventional Trim
In conventional trim the mainsheet controls the angle of attack, and it controls twist. That is, the mainsheet pulls the boom in and down. As you near full trim the emphasis is on the down component - adjusting twist. The traveler takes over the in and out component - moving the boom to center line once the desired twist is achieved, or playing the main in and out in puffs. This technique does not rely on the boom vang as an upwind trim control.
Vang Sheeting
In Vang Sheeting the boom vang takes over the mainsheet's up / down control over the boom, and the mainsheet handles the in / out trim which is the traveler's domain in our conventional upwind arrangement. This technique does not require a traveler.
Vang Sheeting requires a very powerful boom vang, capable of handling the entire leech load. Vang Sheeting is particularly popular on two person dinghies and other boats without back stays. When there is no back stay the vang controls mast bend as well as twist. (The vang pulls the boom down and thrusts it forward. The forward force of the boom bends the mast.)
We all Vang Sheet
On reaches we all vang sheet. On boats using conventional trim methods upwind the vang takes over control of twist once the sheet is eased, and the sheet moves the boom in and out. Vang Sheeting simply uses this trim method for upwind trim as well.
io mi riferisco ad una tecnica (ben nota ai derivisti) ma che si applica anche a barche più grandi (specie senza belin) che si chiama vang sheeting
vi allego qualche informazione (purtroppo in inglese)
Vang Sheeting
Vang Sheeting is an alternative mainsail trimming method.
Conventional Trim
In conventional trim the mainsheet controls the angle of attack, and it controls twist. That is, the mainsheet pulls the boom in and down. As you near full trim the emphasis is on the down component - adjusting twist. The traveler takes over the in and out component - moving the boom to center line once the desired twist is achieved, or playing the main in and out in puffs. This technique does not rely on the boom vang as an upwind trim control.
Vang Sheeting
In Vang Sheeting the boom vang takes over the mainsheet's up / down control over the boom, and the mainsheet handles the in / out trim which is the traveler's domain in our conventional upwind arrangement. This technique does not require a traveler.
Vang Sheeting requires a very powerful boom vang, capable of handling the entire leech load. Vang Sheeting is particularly popular on two person dinghies and other boats without back stays. When there is no back stay the vang controls mast bend as well as twist. (The vang pulls the boom down and thrusts it forward. The forward force of the boom bends the mast.)
We all Vang Sheet
On reaches we all vang sheet. On boats using conventional trim methods upwind the vang takes over control of twist once the sheet is eased, and the sheet moves the boom in and out. Vang Sheeting simply uses this trim method for upwind trim as well.