Not so long ago, the world of motorboat people was still in order. Displacers were equipped with conventional shaft systems that were driven in rotation by diesel engines, while gliders, depending on their size, were motorised with outboards or built-in engines with sterndrives. That was once upon a time. Since the premiere of the Duoprop Z-drive developed by Volvo Penta and the associated new-generation diesel engines, nothing has been the same.
Fast gliders with a diesel engine? The Z-drive equipped with a counter-rotating propeller pair, turbocharger and intercooler make it possible. Today, diesel engines up to 370 hp adorn themselves with the duoprop drive and, installed in a twin pack, conquer the market for fast 12 metre yachts, which until then had been dominated by the shaft drive.
For a little over two years now, the established wave has also had to fear for its supremacy among large yachts up to 50 feet. At least in the glider segment. Volvo Penta advertises its Inboard Performance System (IPS), which is designed to propel boats in this category at speeds of up to 45 knots, with the high efficiency that improves performance and reduces fuel consumption. Even if theory is grey, this story cannot do without a few basic explanations.
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