J/40
Description
The J/40 (1984–1992) is a 40′ performance cruiser-racer that many owners and reviewers still consider one of the best all-round sailing boats ever built by J/Boats. At 40′ LOA (34′6″ LWL), 17,900 lb displacement, and 7,700 lb of lead ballast in a choice of deep fin (6′9″) or shoal keel (5′6″), it carries 925 sq ft of upwind sail on a tall fractional rig (SA/D ~23, D/L ~180) that delivers genuine 8–9 knot upwind speed in a breeze and easy double-digit surfing under symmetric spinnaker. The low, sleek coachroof hides a surprisingly comfortable three-cabin, two-head interior with 6′4″+ headroom, full galley, proper nav station, and excellent tankage—making it a proven offshore passage-maker (multiple Atlantic crossings and a Bermuda Race win). Cockpit ergonomics and all-lines-aft layout allow short-handed sailing without sacrificing racing ability; PHRF ratings typically 72–90. Built to ABS offshore standards by Tillotson-Pearson, the J/40 sails light on the helm, tracks beautifully, and has aged remarkably well. Only 78 hulls were produced during its eight-year run, giving it near-cult status today.
Construction Details
| Designer | Rod Johnstone |
|---|---|
| Builder | J Boats |
| Length | 40.000 ft |
| LOA | 40.000 ft |
| LWL | 34.000 ft |
| Beam | 12.170 ft |
| Displacement | 18000 lb |
| Max Draft | 6.500 ft |
The standard boat dimensions
| i | 50 ft |
|---|---|
| j | 14.70 ft |
| p | 44.20 ft |
| e | 18 ft |
| p2 | - |
| e2 | - |
| i2 | - |
| j2 | - |
| I | J | P | E | P2 | E2 | I2 | J2 |
|---|---|---|---|---|---|---|---|
| 50 ft | 14.70 ft | 44.20 ft | 18 ft | - | - | - | - |
Documents
Sails
J/40 - MAINSAIL
| Luff | * 44.2 ft - (13472 mm) |
|---|---|
| Foot | * 18 ft - (5486 mm) |
| Leech | * 46.86 ft - (14283 mm) |
| Tack Angle | * 88 ° |
| Diagonal | * 47.14 ft - (14368 mm) |
| Head (inches) | * 6 in - (152 mm) |
| Area | * 407.29 ft² |
| Edit in Calculator | |
J/40 - JIBSAIL
| Luff | * 41.69 ft - (12707 mm) |
|---|---|
| Foot | * 19.21 ft - (5855 mm) |
| Leech | * 36.68 ft - (11180 mm) |
| Percentage LP | * 114.97 % |
| Length Perpendicular | * 16.9 ft - (5151 mm) |
| Deck Angle | * 12.01 ° |
| Area | * 352.26 ft² |
| Edit in Calculator | |
J/40 - GENOA
| Luff | * 49.51 ft - (15091 mm) |
|---|---|
| Foot | * 23.52 ft - (7169 mm) |
| Leech | * 46.84 ft - (14277 mm) |
| Percentage LP | * 150 % |
| Length Perpendicular | * 22.05 ft - (6721 mm) |
| Deck Angle | * 3.98 ° |
| Area | * 545.85 ft² |
| Edit in Calculator | |
J/40 - DRIFTER
| Luff | 46 ft - (14021 mm) |
|---|---|
| Foot | 20 ft - (6096 mm) |
| Leech | 40 ft - (12192 mm) |
| Perc LP | * 118.03 % |
| Length Perp | * 17.35 ft - (5288 mm) |
| Deck Angle | * 13.47 ° |
| Area | * 398.95 ft² |
| Edit in Calculator | |
J/40 - ASYMMETRICAL
| Luff | * 49.51 ft - (15091 mm) |
|---|---|
| Foot | * 24.26 ft - (7394 mm) |
| Leech | * 45.55 ft - (13884 mm) |
| Perc LP | * 165 % |
| Area | * 901 ft² |
| Edit in Calculator | |
J/40 - SPINNAKER
| Stays | * 49.51 ft - (15091 mm) |
|---|---|
| MidGirth | * 26.46 ft - (8065 mm) |
| Foot | * 26.46 ft - (8065 mm) |
| Perc LP | * 180 % |
| Area | * 1114 ft² |
| Edit in Calculator | |
J/40 - STORMJIB
| Luff | 27 ft - (8230 mm) |
|---|---|
| Foot | 11.4 ft - (3475 mm) |
| Leech | 20 ft - (6096 mm) |
| Perc LP | * 51.7 % |
| Length Perp | * 7.6 ft - (2316 mm) |
| Deck Angle | * 31.82 ° |
| Area | * 102.57 ft² |
| Edit in Calculator | |
J/40 - STORMJIB
| Luff | * 28.66 ft - (8736 mm) |
|---|---|
| Foot | * 10.82 ft - (3298 mm) |
| Leech | * 24.07 ft - (7337 mm) |
| Perc LP | * 60 % |
| Length Perp | * 8.82 ft - (2688 mm) |
| Deck Angle | * 19 ° |
| Area | * 126.42 ft² |
| Edit in Calculator | |
J/40 - STORMTRYSAIL
| Luff | * 18.25 ft - (5563 mm) |
|---|---|
| Foot | * 16.78 ft - (5115 mm) |
| Leech | * 15.21 ft - (4636 mm) |
| Length Perp | * 15.21 ft - (4636 mm) |
| Tack Angle | * -25 ° |
| Area | * 119 ft² |
| Edit in Calculator | |
Disclaimer. Boats are not all the same -- even when produced in the same factory of the same model. Sailrite does its best to publish accurate dimensions, but we often find it worthwhile to have our customers measure their boats carefully before we produce kits for them. You should take the same precautions, especially when the data is not from Sailrite. The information on this site is not guaranteed to be accurate. Sailrite offers this content as a service to our community, but takes no responsibility for the reliability of the data provided.