Sail Course ® Section 10, Sail Shape. Sail Course ® Figure 10–1 Air Flow Around a Sail.
Trim For Control “Proper Sail Trim is all about balance. All boats will go faster, be more...
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Transcript of Trim For Control “Proper Sail Trim is all about balance. All boats will go faster, be more...
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Trim For Control
“Proper Sail Trim is all about balance. All boats will go faster,be more comfortable to sail and will handle more easily when sailing on their lines.”
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The Goals
Upwind:VMG
Offwind: Maximizing Power
At All Times: Controlling Heel
HEADSAIL TRIM & CONTROLSMAINSAIL TRIM & CONTROLS
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Optimum VMG =
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Beneteau First 36.7 Target Boat Speeds and Angles UPWIND TARGETS DOWNWIND TARGETS
TWS TWA Boat Speed Heel TWS TWA Boat Speed Heel 4 46.8 3.44 2.7 4 141 3.18 .5 6 45.0 4.74 5.8 6 144 4.52 .8 8 43.1 5.57 9.9 8 147 5.54 1.1
10 41.8 6.05 15.6 10 151 6.28 1.2 12 40.8 6.27 18.4 12 159 6.58 .9 14 40.0 6.37 20.3 14 167 6.87 .7 16 39.6 6.42 21.8 16 169 7.27 .7 20 40.4 6.49 22.7 20 171 8.01 1.0 25 42.5 6.53 23.0 25 169 9.01 2.2 30 45.6 6.55 23.4 30 159 10.98 7.3
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the upwind problem
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Sail Depth = Power = Heel
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Headsail: primary controls
Genoa/Jib Sheet Lead Position Halyard Tension Backstay
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Sheet Tension
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jib sheet tension
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why do we need to adjust sail trim
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telltales and trim / driving
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Halyard Tension
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Lead Position
Use tell-tales to set initial lead position
Move lead aft to flatten bottom and twist off top - this will depower the sail
Move lead forward to increase power in sail
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Power Control: headstay sag
Adjusting backstay is primary control of headstay sag
Light air - a little sag is often good
Heavy air - too much sag will hurt the boats ability to go to weather and cause excessive heel
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The Mainsail Main Sheet Traveller Vang Halyard Tension
Cunningham Preventer Backstay Outhaul
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mainsheet
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mainsheet rule of thumb
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twist for control
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Why do we need to control twist
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mainsheet off the wind
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Vang
controls twist off the wind
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traveler
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Luff Tension
CunninghamHalyard Tension
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Mainsail Depth
Outhaul - Controls depth in lower third
Backstay - Controls depth in middle/top
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Three Modes of Trim
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Reefing / the clew
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reefing / the tack
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Putting it All Together
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and more…