Historically, large yachts were built with more than one mast in order to divide the sail area for easier handling. While vessels of M5 's size are typically made from steel or aluminium, an aramid foam core/vinylester sandwich build was chosen to achieve a shorter delivery date, reduced maintenance (regular repainting to inhibit corrosion is not required) and better acoustic thermal insulation. Load and structural calculations of the hull and rig were carried out by Hamble-based firm High Modulus Europe Ltd, (now part of Gurit). Mirabella V was designed by yacht designer Ron Holland. This required the use of a lifting keel to reduce draft. A final demand was that the yacht be able to use the harbour at Palm Beach, Florida. To achieve the amenity requirements, a single mast was preferred to other rig types in order to maximize interior volumes in keel-stepped sailing yachts To achieve the performance requirements, the higher aspect ratio of the single mast sail plan was also preferred in order to provide a better speed potential. The righting moment of sailing vessels makes them more seakindly than powerboats and M5 has achieved speeds in excess of 19 knots in 8 1/2 ft seas. The owner specifications combined fast sailing with motoryacht amenities. ![]() Mirabella V now belongs to Rodney Lewis and has been renamed M5. She was named after Vittoria's previous yachts. Mirabella V was built as part of a fleet of large sailing yachts used for luxury private charters by Joseph Vittoria, former Chairman and CEO of the Avis car rental company. She is the largest single-masted yacht ever built. M5 is a sloop-rigged super yacht launched in 2003 as Mirabella V.
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