HISTOIRE et TECHNOLOGIE BOESCH BOAT
Plus de 90 ans d'expérience. Fabriquant de bateaux de plaisance
renommé par la satisfaction élevé des clients .
Boatbuilder Jakob Boesch acquires the Treichler & Co. boatyard in Kilchberg, laying the cornerstone of the family business.
In the “Golden Twenties,” the company builds, overhauls, and repairs sailboats, motorboats, and rowboats.
Internal combustion engines become more and more popular as power trains for motorboats. Boesch conducts its first experiments with planing hulls.
Jakob’s son Walter Boesch develops the first fast motorboats according to the principle that stands behind the now legendary concept of Boesch horizon gliding. With financial ingenuity and an instinct for business, his wife, Rösly Boesch-Jacober, contributes to the company’s commercial success. The outbreak of World War II causes shortages in fuel and materials; Boesch concentrates on sailing craft and rowboats during this period.
Boesch gains acclaim with its Star boats – small one-off racing yachts with V-bottom hulls. In 1952, Boesch introduces series production. The Type 500 ushers in the era of specialization in motorboat construction. The production of sailboats is discontinued. Thanks to their excellent performance characteristics, Boesch motorboats become the preferred craft for waterskiing enthusiasts.
Boesch begins to craft motorboats in series.
Thanks to volume production know-how acquired in the United States and to productivity enhancements, Boesch is able to further boost its boatyard output. The company firms its reputation as a manufacturer of high-end luxury boats. Celebrities from all over Europe join the circle of Boesch enthusiasts.
The world and European championships in waterskiing are carried out with Boesch boats.
The innovation now known as the Boesch laminate construction, a forerunner of modern composites, triggers a new epoch in boatbuilding. The company’s type families are expanded and production output rises; meanwhile, two-thirds of the boats built by Boesch are exported.
The oil shock, the fall of the dollar, and look-alike competition from overseas forces Boesch to focus on niche markets. The company now develops and builds even larger and more luxurious craft.
Klaus and Urs Boesch, representing the third generation, join the company. Production facilities are relocated to Sihlbrugg.
Boesch launches its first coastal craft, the Daycruiser 720. It demonstrates its seaworthiness during a storm run from Cannes to Corsica at Beaufort 6.
The niche-market approach is refined: Boesch produces classic, high-powered mahogany sport boats. The power train is optimized with the bulge rudder, and epoxy resins are introduced as new coating materials.
The Type 850 boat is available as a classic runabout and as a coastal cruiser – with its V-8 engines, it can attain speeds of up to 40 knots.
The shapes of the hulls and the drive trains are further refined. Development work on the new “Retro” line begins.
The World Waterskiing Championships are carried out with Boesch boats.
Boesch launches the B620 for their 75 year anniversary.
Markus Boesch, Klaus and Doris Boesch’s son, joins the company. As a representative of the fourth generation, he will safeguard the continuity of the Boesch boatbuilding heritage.
Boesch launches the 750 Portofino De Luxe.
Featuring an innovative bow rudder, the Boesch 710 Costa Brava de Luxe makes its debut.
The first Boesch Electric Power are being produced.
Boesch releases their new flagship Boesch 970 Portofino De Luxe. Pure Boesch luxury.
Boesch Electric Power: First official waterski competition with Boesch Electric Power Tow-boat.
Innovation by Boesch Technology
INNOVATION & ADVANCED TECHNOLOGY
Boesch boats are not only remarkably elegant, they are also the delightful outcome of a remarkable design approach. The unique Boesch laminate construction results in an extremely durable and torsion-resistant hull that eliminates all of the disadvantages of conventional carvel planking and is as easy to care for as an ordinary boat with a polymer hull.
But Boesch also defines the benchmark in terms of performance and comfort. The thrill of the Boesch horizon gliding experience is based on a combination of factors: the moderate V profile, the positioning of the engine in the center of gravity, and a direct drive train to the propeller. This produces perfect trim, in competitive situations and quiet cruising, too. It’s not surprising that Boesch boats are among the most popular waterskiing and wakeboarding boats around.
PLANING BY BOESCH / HORIZON GLIDING
Trouble-free planing by a BOESCH boat The central position of the engine, the straight shaft and a propeller operating in an inclined flow field, create an upward lift at the stern. This effect, combined with the dynamic buoyancy of the BOESCH boat, enables it to adopt a horizontal trim position where it is substantially lifted out of the water. Walter Boesch called this HORIZON GLIDING.
The perfect trim of a Boesch boat
1 Centre of gravity 2 Dynamic buoyancy
Optimized hull shape, hydrodynamics, Ideal position of boat's overall centre of gravity, due to engine position Direct propulsion system, straight shaft.
BULGE RUDDER BY BOESCH
THE HYDRODYNAMIC EFFECT OF THE BULGE RUDDER
The bulge rudder was developed during the 80s by Urs Boesch. The flow angles over the entire rudder profile were determined in systematic tests at different speeds and the data was used to perfect the shape of the ‘bulge’. The physical effect: the torsion from the propeller jet is exerted over practically the entire surface of the rudder. More effective use in the water: a Boesch boat sails straight ahead as if on rails and reacts spontaneously to even the slightest touch of the rudder. Even at full speed.
Flow pattern with a conventional rudder blade(defined diameter)
VIEW FROM ABOVE
The rotating propeller produces a vortex in which a conventional rudder acts like a foreign body.
- Propeller position horizontal to starboard
- Propeller position horizontal to port
- Losses due to change of flow direction on the port side of the rudder blade
- Peeling, swirling and cavitation on the starboard side of the rudder blade
- There is clearance in the rudder – the steering effect is poor
- The rudder generates a higher resistance, leading to reduced speed.
- Cavitation creates noise and wear on the material
Flow pattern with a BOESCH bulge rudder
- Perfect steering with the bulge rudder
- The rudder is positioned perfectly in the flow and the steering effect is excellent
- The Boesch boat sails straight ahead – and requires virtually no corrective steering
- Almost no rudder resistance means higher speed
- Minimum noise and no wear on the material
BOW RUDDER BY BOESCH
WHAT THE BOESCH BOW RUDDER DOES
A retractable rudder at the bow of the large BOESCH boats with just one engine supports the sometimes tricky harbour manoeuvres. The bow rudder virtually halves the turning circle and the room needed for manoeuvring; reverse manoeuvres always succeed! When the bow rudder is in the water a regulator limits the maximum speed of the boat to about ten knots.
Action of the Rudder
- Without a bow rudder: low steering moment – little steering effect
- With a bow rudder: ‘multiplied’ steering moment – high steering effect
- Reverse manoeuvres always succeed!
- Forward drop arm
- Reverse drop arm with stern rudder
- Reverse drop arm with bow rudder
- Reverse drop arm with bow and stern rudder
- Reverse stagnation point
- Forward stagnation point
Forward turning circle, with and without the bow rudder
- Turning circle with bow rudder (radius ½ R)
- Turning circle without bow rudder (radius R)
- Centre of deflection
- Theoretical centre of turning circle without bow rudder
- Theoretical centre of turning circle with bow rudder
BOESCH LAMINATE TECHNOLOGY (BLT)
THE SPECIAL PROPERTIES OF BOESCH WOOD TECHNOLOGY
Multiple layers of specially bonded mahogany and a self-supporting stringer-hull design are the primary features of the Boesch hull and the reason for its outstanding performance in the water. The body of the boat is torsionally rigid and stable and there is no working of the wood. The Boesch method of construction is a high-technology process. Weight for weight it gives the wood 25?% more strength than it is possible to achieve with standard GRP.
- Phenol-resorcinol resin
- Up to eleven layers of mahogany laid at right angles to each other
- Outer veneer, sealed with six layers of epoxy resin (sanded down three times in between) and six layers of PU gloss
- Interior, sealed with two layers of epoxy resin
The outstanding properties of Boesch Laminate Technology:
- Extremely high torsion resistance combined with flexibility
- Absolutely perfect finish to the outer skin.
The self-supporting hull
Moteur Electrique ou V8 : It’s a question of choice
V8. THE NAME ITSELF TELLS THE WHOLE STORY
90° cylinder angle, a perfect V, and an almost uniform distribution of mass forces are the recipe for one of the quietest-running and most powerful engines. V8. American design. Sensational development of force even at low revs. When you hear the familiar throb of the Boesch V8 engine you have at least two reasons to opt for this type of drive.
ELECTRIC POWER: OUR 'ZERO EMISSION’ FUTURE
The hiss of the spray and the play of the water. The occasional cry of a gull. What else do you hear? Nothing at all. Welcome to Electric Power from Boesch. You hear nature and ride in your boat, riding Boesch with a force and dynamism that deserve the name of Boesch. Zero emissions, almost complete silence, more and more power. The future has only just begun.