Tuning Guide
Posted: 25/04/2001Spreader Length (shroud to mast)
Crew weight up to 21 stones - 395mm
over 21 stones - 415mm
Deflection (from straight edge across shrouds to mast)
Crew weight up to 21 stones - 155mm
over 21 stones - 145mm
Mast Rake - measured from top of mast to top of transom moulding on the centreline.
Wind light to medium (0 - 15knots) - 7050mm
medium to strong (over 15 knots) - 6980mm
Rig tension - measured on a shroud (measure at the same height each time)
Upwind
Wind Light (0-10 knots) - 340lbs
Medium (11-16 knots) - 150lbs - 160lbs
Strong (over 16 knots) - 90lbs
Downwind
Wind Light (0-10 knots) - 340lbs
Medium (11-16 knots) - 340lbs
Strong (over 16 knots) - 340lbs
1999 National & Inland National Championship Winning Tuning Guide
Posted: 25/04/2001Mast Position
The mast should be positioned in the middle of the mast step.
Spreaders
Length - 415mm long, measuring from the nearest point of the mast to the shroud. Deflection - 135mm.
Mast Ram
Set the ram dependent upon the conditions -
Force 0 - 1.5 - Neutral
Force 2 - 4 - 20mm Inversion
Force 5 plus - Prebend to depower as required
Rig Tension
Force 0 - 1.5 - 30 -100 lbs (leeward shroud just slack)
Force 2 - 4 (max power) 500lbs
Force 5 plus - 400lbs (with mast raked and ram forward)
NB if the wind increases during the race and we can't adjust the shrouds we will depower by slackening the rig tension
Measured using a Super Spar rig tension gauge.
Mast Rake
Mast rake (all measured at 340 lbs and neutral mast ram, from top of the mast to the top of transom housing.
Force 0.5 -1.5 6930mm
Force 2-4 7010mm
Force 5 + 6900mm decreasing to 6860mm
Outhaul
Measure from side of boom above hoop to sail - Upwind
Force 0.5 - 1.5 - 25mm depth
Force 2 - 4 - 25mm depth
Force 5 + - Tight
Offwind ease off and in planning conditions ease off to the limit
Jib Tack
Use a long forged shackle - 40mm. (Bearing Surface)
Mainsail Tack
Use a long twisted shackle through the tack pin on the boom onto the tack eye on the sail.
Fairleads
Set all the back except in medium airs when the car is moved two holes forward.
Cunningham
Force 0.5 - 1.5 - Nil
Force 2 - 3 - Nil
Force 4 - Pull to remove wrinkles
Force 5 + Tight
General Tips
Kicker - Increase purchase to 16:1 by adding a double block at the end of the cascade and a single off the mast step, this makes the use of the kicker a lot easier in breezy conditions
Centreboard - Leave down in all conditions except in flat water on run raise the board head 100mm.
Gybe Lines - Mark centrelines.
Bowsprit - Mark pole out position.
Spinnaker Halyard - Mark when halyard fully hoisted.
Centre Bung - Hang centre bung off elastic to stop being sucked into hole. Tie elastic between the gybe line cleats.
Mainsheet - Add blocks to make 4:1 purchase using a 6mm rope to reduce the load in the jammer. To facilitate uncleating (playing) in heavy air raise the block 2"further off the swivel to prevent it cleating too easily when going upwind. Big knot in end to stop going down self bailer.
Slot Gasket - we tape the front 6" of this up to prevent the water washing in when going downwind
