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Sail technology and trim. Nick Turney North Sails. Nick Turney. Sail Maker for 10 years Professional Sailor TP 52 Farr 40 RP 65 Cookson 50 Professional Coach Farr 40 TP 52 One Design . Sail Technology. Rig Profile. Using measurements from your boat. Sail Sizing.

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sail technology and trim

Sail technology and trim

Nick Turney

North Sails

nick turney
Nick Turney
  • Sail Maker for 10 years
  • Professional Sailor
    • TP 52
    • Farr 40
    • RP 65
    • Cookson 50
  • Professional Coach
    • Farr 40
    • TP 52
    • One Design
sail technology
Sail Technology

Rig Profile

Using measurements from your boat

sail sizing
Sail Sizing

We use the rig profile to design sails that best fit the rig

spiral
Spiral

Edge Curves

Horizontal and vertical curvatures

Broadseaming

3d layout
3D Layout

Puts a yarn or panel layout on a design surface

slide7
Flow

Pressure map for the sail plan

membrain
Membrain
  • Applies pressure from Flow to rig and sails. Coupled with specified material properties and sail control settings, sails and rig are deformed to match sailing conditions for the specified wind speed
sail trim
Sail Trim

Rig Tune

Sail controls

  • Vertical shrouds (Uppers/ Cap)
    • Rake, headstay sag, prebend
  • Diagonal shrouds (lowers)
    • Side to side bend
    • Flatness of main sail
  • Back Stay
    • Headstay sag, mainsail shape
  • Runners/ Checkstays
    • Headstay sag, mainsail shape
  • Big Lines
    • Sheets
  • Small Lines
    • Outhaul
    • Cunningham
    • Vang
rig tuning
Rig Tuning
  • 1. With your boat on land and your mast up, plumb bob the keel to make sure it is straight up and down
  • 2. Set mast parallel to keel
  • 3. Note that sheerline and chainplates are often inconsistent.
slide12
RAKE

The fore and aft relation of center of effort to center of resistance creates helm, weather or lee

More rake increases weather helm, less rake decreases it.

prebend
PreBend
  • Static amount of bend in mast. Affected by:
  • Shroud tension
    • Upper
    • Lower
  • Spreader angle
  • Mast butt placement
  • Placement at deck
shroud tension
Shroud Tension
  • Increased Tension on uppers, gives
  • Increased compression on mast---more prebend
  • Increased forestay tension, to a limit.
sail trim1
Sail Trim

Basic Rule

mainsail trim
Mainsail Trim

Oversheeting the mainsheet will close the leech, increasing weather helm and making the bow want to point up

Easing the mainsheet opens the leech and decrease weather helm, making the boat easier to sail straight

traveler
Traveler
  • The traveler changes power in the mainsail by changing the angle to the wind
  • The traveler will also affect pointing ability
slide20

Boom on center line

Adjust to keep helm Neutral

Up in light air

Down in heavy air

cunningham
Cunningham

Draft forward is a better heavy air shape, keeping the leech more open to depower

Draft aft is a better light air shape, firming the leech for power

outhaul
Outhaul
  • Loose outhaul makes

the lower main fuller

for more power

  • Tighter outhaul flattens

lower main and opens

leech

main sail trim
Main Sail Trim
  • Moderate
    • Outhaul Max
    • Cunningham loose
    • Vang Snug, no slack
    • Backstay, adjust power to keep boat flat
    • Traveler, keep boat flat
    • Mainsheet top parallel or slightly open
  • Light Air
    • Outhaul Loose
    • Cunningham off
    • Vang Loose
    • Backstay, loose
    • Traveler up to boom on C/L.
    • Mainsheet- Top Batten
    • parallel
main sail trim1
Main Sail Trim
  • Heavy Air
    • Outhaul Max
    • Cunningham, no wrinkles
    • Vang very firm
    • Backstay on hard
    • Traveler, down, below C/L
    • Mainsheet, top batten open 5- 10 degrees
head sail trim
Head Sail Trim
  • Jib Lead
    • Controls Twist
    • Forward=more power, less twist
    • Back= less power, more twist
  • Jib Halyard
    • Entry Position
    • Full Entry is better for chop
    • Fine Entry is better for flat water
controls
Controls
  • Jib Sheet
    • Controls Over all shape and depth
    • Inboard and Outboard position
head sail trim1
Head Sail Trim
  • Light Air
    • Medium halyard- finer entry, looser in chop
    • Lead Forward
    • Eased Sheet
  • Medium Air
    • Tighter Halyard in flat water, looser in chop
    • Lead Middle
    • Tighter Sheet
head sail trim2
Head Sail Trim
  • Heavy Air
    • Really Tight Halyard all the time
    • Lead Aft
    • Sheet eased
spinnaker trim
Spinnaker Trim
  • A full shape is more stable and good for power in chop or when pumping
  • A flatter shape provides more exposed area and is most effective in flat water
spinnaker trim1
Spinnaker Trim
  • Pole too high flattens the luff and moves the draft aft, closing the leech
  • 2. Lowering the pole moves the draft forward and opens the leech
spinnaker checklist
Spinnaker Checklist
  • Pole Height, Inboard and Outboard
  • Sheet Tension Discussion
  • Pole angle
  • Keep sheet moving
downwind trim
Downwind Trim
  • Too little vang allows too much twist and flattens the top of the main, depowering the sail
  • Vang on decreases twist and makes the top of the main deeper and more powerful