trim for control “proper sail trim is all about balance. all boats will go faster, be more...
TRANSCRIPT
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.”
The Goals
Upwind:VMG
Offwind: Maximizing Power
At All Times: Controlling Heel
HEADSAIL TRIM & CONTROLSMAINSAIL TRIM & CONTROLS
Optimum VMG =
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
the upwind problem
Sail Depth = Power = Heel
Headsail: primary controls
Genoa/Jib Sheet Lead Position Halyard Tension Backstay
Sheet Tension
jib sheet tension
why do we need to adjust sail trim
telltales and trim / driving
Halyard Tension
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
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
The Mainsail Main Sheet Traveller Vang Halyard Tension
Cunningham Preventer Backstay Outhaul
mainsheet
mainsheet rule of thumb
twist for control
Why do we need to control twist
mainsheet off the wind
Vang
controls twist off the wind
traveler
Luff Tension
CunninghamHalyard Tension
Mainsail Depth
Outhaul - Controls depth in lower third
Backstay - Controls depth in middle/top
Three Modes of Trim
Reefing / the clew
reefing / the tack
Putting it All Together
and more…