J120 front copy

Official Class J/120 Keel Offsets


All Dimensions in mm.
Yc half widths represent Minimum J/120 Class dimensions
Chord Lengths & Depths represent Maximum J/120 Class dimensions

Section 2 3 4 5 6 7 8 9 Tip CL
Chord Length 1530 1430 1330 1230 1210 1370 1570 1770  
Below #2 0 300 600 900 1000 1100 1200 1300  
L E Radius 15.0 19.3 24.5 30.9 33.5 38.9 44.5 50.0 35.0
Xc 
Station
  1/2
 (Yc)
             
.0125 22.7 25.0 27.1 29.3 30.3 34.7 39.7 44.8 23.5
.025 31.3 34.4 37.4 40.5 41.8 47.9 54.9 61.9 29.4
.05 42.6 46.8 51.0 55.1 56.9 65.1 74.6 84.1 37.0
.075 50.4 55.3 60.2 65.1 67.2 77.0 88.2 99.4 42.8
.10 56.2 61.7 67.1 72.6 75.0 85.5 98.3 110.8 48.3
.15 64.1 70.4 76.6 82.9 85.6 98.0 112.5 126.5 53.8
.20 68.8 75.5 82.2 88.9 91.8 105.2 120.5 135.8 56.7
.25 71.3 78.2 85.2 92.1 95.1 108.8 124.7 140.5 58.0
.30 72.0 79.0 86.0 93.0 96.0 110.0 126.0 142.0 58.8
.40 68.9 75.6 82.4 89.1 92.0 105.3 120.6 135.9 58.0
.50 62.1 68.1 74.2 80.2 82.8 94.8 106.6 122.4 56.7
.60 51.7 56.7 61.7 66.7 68.9 78.9 90.4 101.9 54.6
.70 40.0 43.9 47.8 51.7 53.4 61.1 70.0 78.8 51.2
.80 27.5 30.2 32.9 35.6 36.8 42.1 48.2 54.3 42.8
.90 14.4 15.8 17.2 18.6 19.2 22.0 25.2 28.4 24.4
1.00 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
Notes:
1. LEADING EDGE PROFILE SWEEPBACK FROM SECTION 2 THRU 9 IS 0.45 HORIZONTAL/1.00 VERTICAL OR 24.22 DEGREES
2. TIP OF KEEL BELOW SECTION 9 IS DEFINED BY CONSTRUCTING ELLIPSE BETWEEN SECTION 9 OFFSETS AND TIP CENTERLINE OFFSETS AT EACH Xc STATION.
3. LEADING EDGE PROFILE FROM SECTION 2 TO SECTION 8 IS A STRAIGHT LINE.
4. SECTION 2 IS LOCATED 230MM BELOW HULL AT TRAILING EDGE