AN IDEA THAT COMES FROM WAY BACK.
A2V developed Advanced Aerodynamic Vessels’ technology. As already mentioned it derives from the work of past project designers. So we asked co founder Gianluca Guelfi how he and his partners defined A2V technology and most of all where did they started from. How did you come across the idea of exploiting aerodynamic lift on a boat? Well it has been around for some time on competition models. For example offshore catamarans develop a lot of it between their two hulls, in much the same way as three point hydroplanes.the features they have in common have to do with the positioning of the centre of the lift area generated which is situated well forward of the vessel’s geometric centre. Consequently there’s a concrete risk the vessel will capsize at high speed. We carried out in depth detailed studies as to how this technology works, and wrote up considerable data to patent which would enable us to exploit aerodynamics safely (capsizing made impossible) and to optimize the degree of lift at the lowest possible speeds by deploying very efficient curved surfaces. Offshore racers, instead travel at very high speeds in relationship to their displacement while lacking efficient shapes in aeronautical terms since given their speed they have little need for high lift coefficients. Thus we use aerodynamics to increase overall efficiency much like a foiler does. In retrospect a foiler is more complex and in the possibility of going beyond 45 knots ( foils can mess up over this speed and loose efficiency).there are other problems as well, related to the transfer of power from the hull to foils in water and more. Sometime later we discovered that Renato Levi but “Sonny” to hid friends was one of the most prominent project designers in his time and he had already understood and tried to apply the same ideas all his working life. In actual fact “Sonny” Levi had already drawn up “Arcidiavolo” an offshore racer back in the seventies which is still considered revolutionary. Following up on this intuition of his, towards the end of his career “Sonny” Levi had developed the concept of aerodynamic lift further and imagined a super 100 metre boat capable of 100 knots. The project name for this was “Levi Ram Wing”. His idea of the boat of the future.this project of his contained the advantages he had discovered while experimenting on competition models and transport vessels too and came to the same conclusions we found by ourselves through a more scientific approach. We used equipment that did not exist at his time. We carried out much CFD work (computerized fluid dynamics) for both aerodynamic studies and hydrodynamic ones as well.this led to create mathematical models which could delve deeper into details and provide the data we needed to develop A2VS that clearly possess advanced aerodynamic and hydrodynamic efficiency when compared to “Sonny” Levi’s projects. Trials and tests at sea on our 10 metre prototype confirmed all of this as of 2015. Having materialised what used to be “Sonny” Levi’s intuition must surely be a great feeling. Indeed, his ideas were adopted and developed by a colleague and friend of his, this was Franco Harrauer. Both had great intuitions and sensibility and they literally revolutionised planing boats’ naval architecture. those were the years in which offshore events played a major role in inspiring the development of recreational boating across Europe. When reading from some of their texts we can perceive that much of that “hands on” practical experience is being lost today. Both of them are no longer with us today but I managed to contact Franco Harrauer two years ago to show him some pictures of our prototype to which we had applied the ideas they had come up with more than 40 years before. This ongoing project is and has been a wonderful adventure in terms of naval architecture. But when we discovered that all of it had been intuited, imagined and studied to some degree by the two greatest project designers of their time, well this gave us greater motivation and determination and made us feel like “a bunch of dwarfs perched on the shoulders of two giants”. And What now? Well we’re already into our third vessel after having amply demonstrated that the technology has been fine tuned and we’re currently developing more projects of fast vessels with which to carry passengers/ technicians. we’ re also negotiating with important shipyards the possibilities of building new generation commercial and reliable vessels with a speed range of 40 to 60 knots flanked by unheard of amazingly low fuel consumption.
Left - Levi Ram Wing: The 100 metre capable of 100 knots imagined by “Sonny” Levi by developing a tricycle upturned hull which was first used for “Arcidiavolo”. Right - Franco Harrauer also contributed several projects for fast vessels with tricycle upturned hull. View of a 43 metre capable of 100 knots.
Gianluca Guelfi, cofounder of A2V (Copyright F. Boyadjian)