Magnum 47.5, a myth in the modern age

Thanks to the engineers at SNO Yachts, the official Magnum dealer for Europe, the 47.5 is the first Magnum boat to be fitted with outboard engines. With three 600hp Mercurys, we achieved over 51 knots

by Angelo Colombo – photo by Andrea Muscatello

SNO Yachts is based in Sardinia. The Magnum 47.5 was set up there, from the bare hull moulding and deck which were sent over from the US. The island provides a variety of weather conditions within the span of a single day, and for our test, we set out in the morning with a ten-knot north-easterly, but not long afterwards a stiff Levante appeared from the east which meant we could try out the hull’s qualities.

The interior has a bathroom with a separate shower, a dinette with an L-shaped sofa, a mobile bar and a wardrobe; in the forward cabin area, there is a full-beam bed, small sofas and a wardrobe.

On the transom we had three powerful Mercury V12s, each turning out 600 horsepower. They work with a constant sound, and above all they allow anyone at the helm to chat normally, even at 40 knots. The helm station isn’t just comfortable, nice to look at and impeccably ergonomic, but it is also properly protected to ensure total comfort at all speeds and in all conditions.

The boat was the product of an intense story, one that is packed with extraordinary results, and to understand how it handles we tried it out with waves of around a metre at all speeds, and with varying angles of incidence. Of course, correct weight distribution plays a vital role in the dynamic working of a hull. The Olbia-based yard has worked so carefully on this that at fifty knots on a moderate sea, the boat always handled well giving me a feeling of unquestioned safety.

The deck layout is streamlined in the Magnum tradition, but with design elements that are both attractive and practical.

Even going at over forty, and taking waves from the bow right down to the quarter, the hull always reacted well, it never lost too much speed, got going again decisively, and reached over 51 knots. It’s great fun. It is extremely manoeuvrable and the hull works with the sea and absorbs it while being at the helm of a yacht that oozes luxury wherever you look. Handing back the wheel to the yard employee who accompanied us left us feeling like a child being asked to surrender a favourite toy, with the strong urge to stamp our feet saying: “Mine!”.


The Magnum Marine legend began in 1966 with the Maltese Magnum, a 27-footer in which Don Aronow won the Offshore World Championship. This led to the decision to start building fast boats. After the 27’, Aronow built a 35’, with which he won the world championship again. He went on to develop other boats, which have always stood out in the sport for their high speed and seaworthiness. In 1968, Aronow sold the shipyard to an entrepreneur who had achieved great success with the 27’ and 35’. It was then that the company developed the 28’ and began to offer more space inside, albeit in a hull that was capable of causing a few surprises in competition. This would expand the potential territory for the brand, which was already well established among fans in the USA and elsewhere. Speed and safety have always been at the heart of every Magnum project, from the earliest designs to the 47.5 described in this article. It was at this time that Filippo Theodoli, a native of Le Marche, decided to become the Magnum dealer for Europe and was impressed by the level of performance, comfort and safety offered by the 35-foot model, which attracted widespread interest. When passion and entrepreneurial ability come together, something significant is bound to happen. And indeed, in 1976 Filippo Theodoli and his wife Katrin bought Magnum Marine and helped to spread the legend among a group of boat users who were less interested in racing. It was their intuition that turned a boat designed for competition into a luxury yacht with nautical characteristics of great technical value. Since then, the history of the Magnum brand has been enriched by famous boats and owners, including the police and armed forces. From the 53’ to the 45’, to the 40’ as an evolution of the 38’, to the 63’, which in 1983, when it was launched, was internationally recognised as the most powerful, efficient and safe boat in existence. When Filippo Theodoli disappeared from the scene in 1990, his wife Katrin took over to continue the work with the same passion and excellent results as her husband. Three years later Magnum presented the new 50’, then in 1999 the new 44’, in 2001 the 60’ and then the 80’, until we come to our time and the project to build the new 100’.


It is lightning quick in getting the revs going, in getting on a plane and reaching top speed from a standing start, it is agile like a small walkaround but also comfortable and dry like a large-scale luxury yacht. Something else that deserves full marks is the layout of the interior and the deck set-up that has been redesigned by architect Ivo Maria Redalli. He is another fan of fast boats and somebody who has brought a very effective, updated look to the yacht, which now also benefits from a more modern design. Anybody who still thinks that a Magnum can only have onboard engines and surface propellers should perhaps ask themselves if the power and extraordinary technology that is nowadays delivered by outboards like Mercury Marine’s V12s might not also be a very valid solution in giving Magnum boats… an extra gear.

Manoeuvring simply, quickly, safely and intuitively, with impeccable trim at all speeds might seem a given, but that is by no means the case. We found all that on the Magnum 47.5 we tried. The first thing we felt during the test was that we were on board an extraordinary boat in terms of seakeeping. Of course, there is no lack of luxury, and you can feel it just as soon as you get on board. But you appreciate it more when stationary, since already at ten knots what you feel is that you are on a boat that is agile, fast and which can cut through the sea without any hesitation, turn at over 40 knots in less than two boat lengths without ever losing course, or taking any strange thumps. All of that while on board you can’t even hear the smallest creaking, unexpected noise or anything else that might make you think it could have been built any better. You can chat with your fellow guests without having to raise your voice and, after a good three hours, go back to land relaxed but enriched by a beautiful experience.

Engine data
Three V12 Mercurys, each producing 600 horsepower, keep the boat moving at all times, allowing you to manoeuvre nimbly at all speeds.

[email protected]

Shipyard technical department • Arch. Maria Redaelli 

LOA 14.10m • Maximum beam 3.28m • Draft 0.75m • Light mass displacement 13,000 kg • Full mass displacement 16,000 kg • Fuel tank volumes 2,700 l • Water tank volume 170 l • Generator’s tank volume 135 l

3 Mercury Verado V12 • Outlet mechanical power 441 kW (600 hp) • Number of cylinders 12  • Swept volume 7.600 cc • Maximal rotational speed 6400/min • Weight 572 kg

EC Category CAT A

1,900,000 € Excl. VAT (October 2023)

(Magnum 47.5, a myth in the modern age – – October 2023)