05. March 2013 15:40
First inwater test drive of new Boesch model Sunski 625 at yard on Lake Zurich
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.
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.
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.
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.
VIEW FROM ABOVE
The rotating propeller produces a vortex in which a conventional rudder acts like a foreign body.
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.
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.
The outstanding properties of Boesch Laminate Technology: