505 North Sails Tuning Matrix

Updated August 17, 2003

DRAFT

Wind Rake Shroud Ram Bend Jib leads Jib leads Centerboard Jibsheet tension Outhaul Comments
knots forward aft tension   at rest   Outboard        
 
0-1 2 25'10.5" 150?
forestay sagged
10-15
as high as possible
5.5 -2
flat water
in 0 easted for twist eased 2" flat main entry, open (twisted) jib slot, lots of jib luff sag
2-4 2 25'10.5" 150?
forestay sagged
8 lots -1
flat water
in max forward ? eased 2" flat main entry, closed jib slot, lots of jib luff sag
5-7 3 25'9.5" 140 6 2.5" 0 in max forward ? eased 1" straighter mast than very light, fuller main entry, noticeable jib luff sag
8-9 4 25'8" 250 4 ? 1 in max forward ? ?  
10-12 4.5 25'7" 300 3 ? 1 in 0 ? eased 1"? Ease shrouds when underpowered, tighten shrouds when getting overpowered
15 6 25'4" 400 3 ? 1 in 1/2" ? eased 1/2" ?
18 7 25'2" 500 2 ? 1 1/2" out 1" ? just tight  
19-22 7.5 25'1" 600 2 ? 1 1" out 1 or 2 ? tight  
24 8 25'0" 650 0 ? 1 1" out 5" ? tight  
27 9 24'10" 700 0 ? 1 2" out 7" ? tight  
 
Main cunningham and Jib cloth - leave the wrinkles in in light air, and progressively tighten as the windspeed increases.
Increasing cunningham tension to depower as the breeze comes on. Pull it VERY HARD for heavy air and when overpowered on spinnaker reaches
Jib lead is moved aft for light air AND FLAT WATER. Move it forward for light or medium air with chop. Otherwise leave it at 0 or 1 all the time.
When racing light, you may wish to let the ram up BEFORE you start raking the mast aft to depower. Aft rake does depower but you lose pointing. Light weight teams that are forced to depower before 505s are planing upwind may do better to depower with more mast bend rather than rake, until the breeze builds to allow planing. Heavier teams that can plane upwind without depowering can depower by raking as the breeze builds, as all 505s will be planing and sailing a little lower by the time the heavy team needs to start depowering.
The bend at rest values are estimates for now. I will try to get more accurate numbers for those who wish to eyeball mast bend that way.

If the numbers don't mean much to you, read the calibration notes