J/125: J-Boats returns to its racing roots
with an innovative lightweight speedster
By John Kretschmer with photography by Michael Wootton
The J/125 makes you feel young all over again. Remember sailing a J/24 for the first time? The boat seemed to defy gravity, or at least friction, as it surfed down waves in perfect control, blowing by 35-footers in the process. This new 41-foot flyer, designed by Rod Johnstone, delivers a similar thrill in a larger, brilliantly conceived package. Innovative designs and engineering excellence are certainly the key factors in J-Boats'ongoing success. Another reason the company often seems one step ahead of the competition is that it takes consumer research very seriously
J-Boats surprised many in the sailing industry, including me, when a few years ago it changed its focus, adding performance cruisers to its line of one-design racers. Emphasizing easy-handling small headsails with asymmetric chutes, clean deck layouts, large cockpits, low maintenance and spartan but well-thought-out interiors, designs like the J/42 and J/160 helped usher in a new age of cruising whereby sluggish sailing was no longer acceptable. The company has once again checked the pulse of J-Boat owners and potential owners and the results are intriguing. After conducting an extensive survey, J-Boats recognized the need for a very high-performance boat in the 38- to 42-foot-size range that offered an easy-to-handle alternative to grand prix designs with large campaign budgets. The result is the J/125, which I tested recently.
Light, Fast, Strong...
Fast and light are the key words, and the numbers don't lie: LOA 41 feet; LWL 37 feet; beam 10 feet, 8 inches; draft 8 feet; displacement 8,350 pounds with a ballast ratio of 55 percent. To put it in perspective, the J/125 displaces nearly 3,000 pounds less than the Farr 40.
The J/125 is built by TPI Composites using its patented resin infusion SCRIMP process. The completed laminate, including stringers and floors, is placed in the mold dry. A vacuum eliminates air voids and then draws only enough resin to wet the laminate. The hull and deck are then post-cured in a closed oven at 140 degrees for 25 hours. The net result of this sophisticated construction method is a hull that has twice the strength of a conventional hand layup and is dramatically lighter. Just how light? Without the keel, engine, rig and hardware, the J/125 weighs 2,700 pounds. The laminate is composed of Kevlar and E-glass for the outer skin with biaxial and unidirectional carbon fiber making up the inner skin. CoreCell foam, which is thermoformed to the shape of the boat in a separate tool, is used between the skins. The bulkheads are also composite. The high-aspect keel is made from a nickel, bronze and aluminum alloy and the bulb is lead.
The 10 keel bolts are stainless and the wide flange is well-supported by a solid E-glass and Kevlar backbone, although I would not be comfortable sustaining a hard grounding in a boat with a keel that is not supported with some kind of stub. A kelp cutter, which fits on the leading edge of the keel with a wand control on deck, is an interesting option. The rudder blade is reinforced carbon fiber as is the stock.
A huge, scooped-out carbon fiber wheel trimmed in black foam dominates the long, open cockpit. The wheel weighs just 4 pounds. The cockpit is well setup for sail control and offers good foot support and visibility at the helm. Standard primaries are Lewmar 48ASTs, with 44ASTs chosen for the secondaries and for the mainsheet winch, which is mounted on the aft end of the deckhouse. Harken Speed Grip winch handles offer even more power. The Harken Big Boat series mainsheet traveler, which is forward of the binnacle, can be easily adjusted from the helm. Harken Black Magic blocks are standard on the halyards, checkstays and turning blocks. The genoa and jib leads are load adjustable. The deck nonskid is excellent, but I thought the stanchions could be taller. Although the cockpit can accommodate a handful of crew, you really don't need them-the boat can be sailed efficiently with two people, which makes it quite different from its IMS cousins
The interior is utilitarian. As Bob Johnstone told me, "If people want a cruising boat, they should buy the J/120." This boat places a high priority on the ultimate sailing experience, not liveaboard comfort. This boat includes four berths, a head, a hanging locker, a couple of drawers, a chart table, a sink, an Origo stove-in other words, just the bare necessities for sleeping aboard. Johnstone went on to explain that although the 120 and 125 are similarly priced, the difference is that the money that goes into a 120 interior is used in the higher tech construction of the 125.
The interior arrangement features sail lockers or optional adjustable pipe berths forward, followed by a head and hanging locker opposite. The galley is along the port main bulkhead across from a decent-size navigation desk, with room for repeaters above. The settees in the saloon serve as good sea berths. Most molded surfaces are finished with gelcoat. The headliner is a foam backed liner. Two quarter pipe berths are aft, with terrific access to the Yanmar Saildrive located between them. There are wellplaced stainless steel handrails that run from the main bulkhead aft to the companionway.
The J/125 is powered by a Yanmar 20-horsepower diesel Saildrive. This is more than enough power for the boat and the 20-galIon fuel tank will probably not need to be refilled but once a season. Although the electrical system is basic, featuring two small gel-cel batteries and a Guest three-way switch, typical of all Js, the workmanship is first-rate and accessible.
J-Boats has every intention of creating a lively new one-design with the 125. They emphasize that it will be an owner-operated, family oriented class that will work on a local level. Although the boat has a harsh rating under PHRF, the 125 is so fast that it will be extremely competitive under any rule. However, one-design racing will be the most fun with the 125. Establishing a successful onedesign class is not as easy as one might think; careful control of the manufacturing process is paramount. The SCRIMP process allows J-Boats to keep the 125's weight tolerances to an astonishing plus or minus one percent of the total weight, and tight class rules have already been established. It is important for old boats and newer boats to compete on a level field if a one-design class is going to make it in the long run. J- Boats has a proven track record in developing and maintaining onedesign classes.
On the Water....
The steering was fingertip control and the carbon fiber wheel felt uniquely in tune with the rudder as a small adjustment produced an immediate course change. Carol and Bob scooped up the chute and brought the 125 u for some close-winded work
The boat consistently topped 7 knots well inside 30 degrees apparent, and at times eased into the 8s. I was very impressed by the 125's motion through the water. The combination of deep draft and low center of effort with an extremely light rig and hull, made for a great ride. Fortunately, the wind increased as we sailed toward the Bay Bridge. We cracked the sheets and blasted over 8 knots. The 125 never felt overpowered, or even skittish, even when we brought the boat back on the wind and again tracked along inside 30 degrees apparent without losing much speed. Unlike other similar onedesigns, the helmsman can readily trim the main and, with a bit of stretch, the headsail.
With the J/125, Rod Johnstone has changed the great performance equation. He has managed to avoid the necessity of putting a lot of meat on the rail to keep the boat on its feet (although it will help at times). This translates into less crew, and while the sailing is still exhilarating, it can also be more spontaneous. The J/125 makes grand prix sailing an option for those who don't want the hassles of organizing a large racing campaign. The Johnstones have always appreciated sailing performance for its own sake, and the new 125 is destined to become another boat by which others are measured.
J/125 Sailing Reviews & Articles
Winning The Chicago-Mac 1999
Back in May (’99) my friend and customer Mike Rose of Houston called to say that he didn’t have the time to do Block Island Race Week. We had been preparing for the regatta since Key West R.W. and his new J/125 Raincloud was a blast to sail. “What regatta can we do later in the summer?” Mike asked. “What about the Chicago – Mac Race? I heard it’s a lot of fun” So off we went, six Texans and a couple of Yankee’s. Read more here.....
Flying South for the Winter on a J/125
Jeff Johnstone caught up with Dan Mullervy of Annapolis and heard about his recent experience crewing aboard the J/125 STRABO. The story begins with the delivery down the coast and winds up with STRABO winning Class A in the Fort Lauderdale to Key West Race. Read more here....
J/125 PHRF/Sportboat of the Year
Over the last five years, sportboats have evolved into highly refined sailing machines that offer incredible performance with a touch of offshore capability. This year, the competition in our PHRF/Sportboat category included the J/125 the One-Design 35, the Van Gorkam Mount Gay 30, and the Quest 33. All are remarkable boats rampant with innovation, but the long, lean, and mean J/125 simply blew away its competition. Read more here....
TEST-DRIVING THE J/125
Sure—I’ve heard all those stories about people who are too dumb to come in out of the rain. Yet on Tuesday afternoon there were seven of us sailing in the rain on San Francisco Bay. And while I can’t speak for the others, I was having a blast. How’s come? It was because I was taking my first test-drive in the new J/125. Read more here....
J/125: Innovative speedster
The J/125 makes you feel young all over again. Remember sailing a J/24 for the first time? The boat seemed to defy gravity, or at least friction, as it surfed down waves in perfect control, blowing by 35-footers in the process.
This new 41-foot flyer, designed by Rod Johnstone, delivers a similar thrill in a larger, brilliantly conceived package. Innovative designs and engineering excellence are certainly the key factors in J-Boats'ongoing success.
Another reason the company often seems one step ahead of the competition is that it takes consumer research very seriously. Read more here...
J/125..."A Spectacular Sailing Machine"
The 41 foot J/125 is as close to high performance big-boat sailing one can find in a boat that’s manageable (yes, even with spinnaker) by two or three people. J/125 is like a street-legal Indy 500 car that’s easier to drive than the family sedan. Joy in ownership (and investment) is a function of time spent sailing. Time sailing depends on how easy it is to be off “on the spur of the moment” inspired by a beautiful day without having to organize 8-10 crew.Easy to Go Sailing -How easy? Throw off the cover and hoist the mainsail on slides from the cockpit using a 2:1 halyard purchase. Cast off and sail faster under mainsail alone than most boats under full canvas. Unroll the jib and fly upwind. Ready to really take off? Pull out the retractable carbon bowsprit. Hoist the spinnaker in its sock. Then from the cockpit, slide the sock up the sail to deploy the spinnaker. Trim the sheet. Hold on to your hats!
To jibe, cast off one sheet and pull in the other. No need for anyone on the foredeck. To douse the spinnaker, cast off the sheet and pull the sock down over the sail from the cockpit. Stow when ready. Can you imagine the surprise of other sailors as you fly by them in 15 knots of breeze doing 10-12 knots?
Getting the Gun - One of the thrills J/125 owners experience frequently is being first-to-finish and getting the gun. The local crowd ashore assumes, as in other types of races, being first across the line determines the winner. J/125 upwind target speed is 7.8 - 8.0 knots. 10+ knots downwind is a daily occurrence. In fact we know of no other boat of its type and length that’s faster. Finding crew for weeknight and Saturday races is hardly a problem when you’re first to the party.
Stability & Seaworthiness- The sense of solidity and power when sailing the J/125 is explained by J/125’s extraordinary stability index of 143 degrees with a stability curve ratio of positive to negative areas of 12.5:1. This greater stability is combined with a balanced hull-form with proper amounts of reserve buoyancy forward, capable of safer & controllable higher-speed planing offshore in large waves and providing a wider steering groove upwind for sustained peak performance by average helmspersons. No IMS rule-inspired hull form can match the high 4.72 length to beam ratio of this sea-kindly yacht nor the reserve buoyancy designed into her bow sections. High length to beam ratio insures straight tracking in rough seas and light steering loads. Sailboats with fine bows and full midship sections are more difficult to balance and more likely to spin out of control in big waves.
What’s Unique About J/125’s Construction? The J/125 is built to ABS offshore specifications by TPI Composites using the SCRIMP resin-infusion process. Tests conducted by the US Naval Surface Warfare Center at Carderock, MD established that the properties of laminates produced by TPI's patented SCRIMP resin-infusion process are superior to low-energy pre-pregs used by many custom boat shops and twice the strength of hand lay-up.
J Boats was hesitant to enter the lightweight race boat market until something like SCRIMP/Carbon technology became available. In our judgment, SCRIMP construction greatly reduces the chances of warranty claims due to laminate failures resulting over time from pounding into waves and/or rig tension or ballast loads.SCRIMP Process- The entire laminate is placed in the mold dry. A high vacuum eliminates any air voids, then resin feed tubes draw in only enough epoxy to "wet" the laminate. This is the TPI patented SCRIMP resin-infusion process. The last step in the process is to post-cure the hull and deck at 140 degrees in a closed oven. As can be seen from the chart, SCRIMP laminate properties in terms of compression strength, flexure, and tension are twice the strength of hand lay-up and significantly stronger than low energy (vacuum bagged) post-cure
pre-pregs. There is no entrained air in a SCRIMP laminate. 1% void content reduces flexural strength by 10%. Note that 50% fiber content in a carbon laminate equates to 67% carbon/33% resin by weight. See the comparison of composite properties of low cost fabrication methods in the chart above.
Weight of Construction- after subtracting weight of keel plus 1000 pounds of rig, engine and hardware, J/125 at 2700 pounds is as much as 1500-2500 pounds lighter than competitive designs. Not all of this has to do with the J/125’s narrower beam.
The CoreCell A500 and A600 foam cores of the J/125 laminate is further processed for strength and to save weight by:
(a) thermoforming to the shape of the boat in a second set of tooling to avoid having to slit the foam to bend it to the shape of the boat, and
(b) perforating on 2" centers to form epoxy rivets between hull skins. If the core is slit to bend to the boat, then either resin fills the slits and adds weight, or there are air pockets in the laminate which reduce strength.
(1) The strut is cast of an NAB (nickel/aluminum/bronze) alloy rather than from steel/iron which can rust causing maintenance headaches,
(2) The integral flange of the strut has a six square foot interface with the hull in two parallel rows of ten 7/8" stainless bolts. And,
(3) Built into the leading edge of the keel as an option is a San Diego style kelp cutter.Introduced: 1997 Built to: Hull #16 Last Model Year: 2003
Sailing for Life in Better Sailboats
Sailing is the ultimate freedom, the experience of being at one with nature and the sea, powered only by the wind and one's imagination. It's one of the few "life sports" that offers both a relaxing escape as well as an invigorating challenge. You pick your level of comfort and excitement. Sailing is never the same twice - each time on the water with your sailboat is a unique adventure that can enrich friendships, strengthen family ties, and refresh one's own sense of well-being. How many other outdoor activities can be shared with three or more family generations? It's been said there are two types of sailors in the world - the young and the young-at-heart.
What a Difference a J Makes
Fulfilling those sailing dreams starts with finding a sailboat that fits you - whether you aspire to sail close to home, cruise to distant shores, or take up the challenge of competitive sailing. Performance differences between sailboats are greater than differences between golf clubs, tennis rackets, skis or cars. A well-designed sailboat, like a good sports car, is an extension of its owner. It could take years of sailing other boats to learn the difference that good design and quality make to one's sailing enjoyment. Or, you can save time and take advantage of what we've designed into every "J."
J/121 Offshore Speedster for 5 or fewer Crew
The J/121 is a 40’ offshore speedster that can be day raced or distance sailed by just 5 or fewer crew…. the best short-handed J ever…. capable of winning on any race track while also excelling in daysailing and weekend mode. J/121 redefines offshore sailboat racing as a recreation and shared adventure with friends - fulfilling the growing need to simplify life and reconnect with those you really want to sail with on a boat that’s pure magic to sail. Learn more about J/121 here.
Elegance, Comfort & Style- J/112E
J/112E is the newest “E” Series of sport-cruising yachts. An Evolution of Elegant performance cruising design. This dual- purpose 36 footer has a spacious two-cabin layout and a roomy, comfortable, cockpit. Perfect for the annual club cruise, offshore racing or short-handed blue-water sailing. Learn about J/112E here.
A Family-friendly One-Design & Daysailer - J/88
The J/88 combines big boat feel with sportsboat- like acceleration. Add a weekend interior, inboard head, engine and huge cockpit and you have a versatile 29 footer. Blistering upwind speed of 6.5 kts and trailblazing speed offshore means smiles all around as you collect both the silverware and priceless sailing memories. Learn more about J/88 here.
J/99 - Offshore Shorthanded Speedster
J/99 is the newest offshore speedster. It combines headroom and comfortable interior accommodation with the tiller-driven response of a sport boat. The sail and deck plan are optimized for easy handling with fewer crew, and incorporate the latest developments from the award-winning J/121 and the new Offshore Sailing World champion J/112E. Learn more about J/99 here.
J/70 - The Sportboat Changing Sailing
The J/70 speedster is a fun, fast, stable, 22 footer that can be towed behind a small SUV and ramped launched and rigged by two people. J/70 sails upwind like her larger sibling (the J/80) and off the wind she simply flies - planing fast in moderate winds. With 1,400+ boats delivered worldwide, the choice is clear. Learn more about J/70 here.
J/Sailing Gear For 2019
Look great this season in J sailing apparel. Check out the comfortable and fashionable sailing clothing, tech shirts, polo shirts, sailing jackets and sailing hats at the J/Sailing Gear site. Also backpacks, totes, J battleflags and other fun items like half-model sailboats are available as gifts and trophies.
J/Gear is fully customizable to your needs. When you order, you can specify just about anything you wish, including boat name, boat type, yacht club, hailing port, etc. Please visit the J/Gear store here.
Upcoming Sailing Events
Oct 11-12- J/80 Copa de Espana- Coruna, Spain
Oct 17-20- J/88 North American Championship- Rye, New York
Oct 18-20- J/105 Masters Regatta- San Diego, CA
Oct 19-26- J/24 World Championship- Coconut Grove, FL
Oct 19- Rolex Middle Sea Race- Gzira, Malta
Oct 25-27- J/24 East Coast Championship- Annapolis, MD
Oct 25-27- J/Fest Southwest- Lakewood, TX
Oct 25-27- J/105 Lipton Cup Regatta- San Diego, CA
Nov 1-4- French J/80 Championship- La Rochelle, France