J122_upwind02

What a Difference a J/ Makes!

VMG

Now it's possible to sail fast with just a friend or two as crew. After all, isn't this how we sail most of the time on a day's sail or when cruising? Rarely is the gang aboard to hold the boat down or fly a spinnaker.The measure of a good sailboat is how well it sails upwind and downwind with only 2-3 people aboard. The goal is VMG, Velocity-Made-Good, straight into the wind or away from the wind, considering both speed and sailing angle. Many of the modern integrated instrumentation systems can display this data, or you can use a set way-point to windward on a GPS to come up with the number. Good short-handed VMGs are when a "50-something" husband & wife jibe a J/105 (34.5 ft.) with asymmetrical through Woods Hole against the current, while others motor. Or, if you can beat upwind in steep waves doing 6.8 knots with a VMG of 5 knots in 18 knots of wind!

Safe, Fast & Easy

Flying an asymmetrical spinnaker from a retractable, carbon-fiber bow sprit is a one person job. By using a cockpit-operated snuffer, no one has to be on deck when the spinnaker is flying, being jibed or doused. To jibe, simply let off one sheet and pull in the other. Downwind VMG is doubled. Result? Less motoring and more sailing.It's safer. One corner of the spinnaker (the "tack") is always secured to the bowsprit, eliminating wild oscillations. The sail has more slope to its leading edge with a center-of-effort located further forward and lower. Wind gusts lift the bow, propelling the boat forward with finger-tip control. No more "white-knuckled" round-up broaches.Speed from the asymmetrical's greater power pushes the apparent wind 30-50 degrees forward of the true wind direction. In light air and lumpy seas, the sail's added power steadies the boat. Deep sailing angles (160-170 degrees True Wind Angle) are achieved in a breeze. The luff, which is 8% longer than the straight line distance from tip of the sprit to halyard exit on the mast, rotates to windward as the sheet is eased - projecting area to the wind like a conventional spinnaker when pulled back by a pole.

That Feel

The new Js instill a sense of confidence, freeing one from anxieties. Even when planing at 10+ knots, one feels in total control. There's less work. Guests aren't pressured into unfamiliar tasks. Fewer orders are needed. It's more fun...like a good sports-car, turning as if it were part of you. Not with sluggish delay. But with a smooth, even response - around crests, down waves and through crowded harbors.

Mainsail Only

J's sail well flying any sail combination you feel comfortable with. For harbor-cruising or heavy winds, an unreefed main is the answer. If the boat sails 6+ knots under main alone, why bother with large overlapping jibs? Visibility is improved. The big main is a bonus for "cruising canvas" races. And, it takes one person to sail the boat. High wind mode is a flattened mainsail with open leech, achieved by tightening backstay, cunningham, vang and outhaul. These adjustments are quicker and easier than reefing. The jib can be rolled up and forgotten.

34% Upwind VMG Gain?

Hull design, rig, sailing length and weight location greatly affect VMG. You see many cruising boats motoring upwind in both light and heavy air. Why? Not enough sailpower for light air or stability for a breeze. For example, the J/109 (35 ft.), sailing upwind at 7.2 knots, 38 degrees from the true wind (25 degrees apparent) will have a VMG of 5.7 knots. This is 15% faster than boat X sailing 7 degrees further from the wind at 7 knots with a VMG of 4.7 knots. And, it's 34% faster than a classic cruiser doing 6 knots with an upwind VMG of only 4.2 knots. These differences are inescapably locked in by design and construction.

Low Center of Gravity

Good upwind VMGs are only possible with a low, vertical center of gravity (VCG). Top-heavy boats roll and pitch. This motion disturbs water flow around the boat and airflow past the sails, not to mention equilibrium of the crew on deck. The lower the weight of the boat relative to its waterplane, the greater the stability, the more sail that can be carried and the smoother the motion. This explains a J's smooth, stable ride through waves. The VCG is well below the waterplane.

Resin Infusion Process

You get what you pay for. Low VCG is achieved by light, strong construction of what's above the water. Since 1994 most J models benefit from the innovative SCRIMP resin-infusion process. End-grained, aircraft-grade balsa-core laminates have structural GRP skins with 65-70% glass content, or the equivalent of custom high-tech, oven-baked pre-pregs.High

Performance Rigs

The best place to reduce weight is aloft. All spars are custom-designed for J Boats, race-tested and abused to insure reliability with a good safety margin built-in. Running backstays aren't required. For models like the J/122 and J/133, a carbon-fiber mast is specified to further optimize upwind stability and VMG for short-handed cruising. These custom-engineered, one-piece, autoclaved spars by Hall Spars have a luff track designed for low-profile and low-friction slides. The 120-130 pound weight saving aloft is equivalent to having two invisible 200 pound genies sitting on the weather rail to improve performance.

Ballast & Shoal Draft 

The best place to add weight is in the keel. A lead keel, fixed under a structural molded sump, having much of the weight in a bulb at the bottom, serves to optimize a boat’s stability without adding excess draft. J’s combine low VCG ballast with quality construction - especially important when opting for a shoal draft keel. Cruising "J’s” with shoal draft keel routinely outperform longer, deeper draft cruising boats. Before deciding on this option, consider that the need for shoal draft may be a function of speed. A fast boat, that easily sails 50 miles in a day, puts more deep harbors in range than can be visited in a year.

Horsepower

Sails are the horses. A light boat with clean lines and good stability can carry the sail power needed for lively performance. There's no need for tall, scary rigs with heavy sheet loads and winches. Sail Area to displacement (SA/[DSPL/64]^.67) is a good indicator of how much horsepower the design can handle and what its speed potential might be. Look for ratios over 20. The J/122 is at 23%.

Low Resistance

Too much weight usually means too much wetted surface (WS). Like brake shoes. The more WS there is relative to sail area, the quicker you stop. A good SA/WS ratio is critical for performance in light air conditions. Among 40 footers, J/122's ratio of 3.1 is FAST. A boat with a 2.0 would be "glued." Then there's form drag. It's usually faster to be long and narrow. But only when combined with greater stability and sail power. A length (LWL) to beam (BWL) ratio greater than 3 is desirable for good directional tracking in waves. Then, oversized keel, skeg or rudder surfaces aren't necessary. A long canoe tracks, a pram spins. J/122 has a healthy 3.6:1 ratio with flared topsides. Flare slaps waves down and keeps the crew dry. Vertical-sided hulls bounce waves up on the crew.

Speed Rating 

The rated speed of most sailboats is published. Order a copy of PHRF Handicaps from US SAILING (401-683-0800). It's how we know the projected speed of a J/120 with genoa will be 30 seconds per mile faster than a Sabre 42 - more than the length a football field after 8 minutes of sailing! Or, that her all-round speed will equal boats which are nearly 20 feet longer, such as a Swan 57, Hinckley 59 or Deerfoot 62. An often overlooked benefit of such speed is the help it gives you in route-planning when dealing with weather systems.

Your Next Boat

Now more than ever before, differences between sailboats are greater than differences between golf clubs, tennis rackets, skis or cars! Performance is the reason you don't see wooden or solid fiberglass tennis rackets, skis or golf clubs anymore. A fast new "J" can make a beginner look very good, leaving the experts far astern with little solace that slow is easier or more comfortable. It could take years, owning and sailing all types of boats, to learn that good design and high quality composite construction makes so large a difference. Or, you can make the most of your time and dollars by acquiring what we've learned and are designing into every new "J."