Green Yachts Sail 40

Hull and sail plan of Sail 40 allows a great potential in terms of speed, thus pushing up the limits of sustainability of the boat; a high speed and a good amount of surfaces, as a matter of fact, means that we can develop a wide range of technology to produce energy while sailing:
• solar panels: coachroof design con handle an array of approx. 10 sq. meters of flexible solar panels,
integrated in first stage design, so that they won't looked "stichted up" on the boat; a IACC (america's cup)
style high profile mainsail boom will be enriched with further 5 sq.meters of solar panels;
• low resistance towed generator: these are the new version of "old" school towed propeller; nowadays technology give us the chance to have low resistance and highly efficient generator directly on the stern of the boat, positioned slightly inside the rudders; generators can be tilted out of the water if needed; this technology is by now widespread on IMOCA 60 round-the-world racer;
• wind generator: a pole on the stern allows us to gain another bit of energy, adopting a new-generation low noise 100 cm class windmill
• engine: we adopt a 50 HP-15 kw inboard hybrid engine, mixed electrical and diesel , even here the electric engine may act as a dynamo when sailing, giving us energy to charge the battery packs on board;

We don't want to give a math salad here dealing with amperes and volts, but we can assure that , given an average cruising day, the on board energy generating technologies give us the 100% of energy to cover all the cruising needs (what in design terms we call "hotel loads"), with just one caution: we have to manage carefully our energy storages adopting all technologies available to slow down battery drainage, such as LED lights , both on the interiors and for exteriors and navigation lights. In this way we can use our diesel engine mainly as an emergency source of energy, thus cutting dramatically our emissions and fuel needs.