89m mast re-stepped on sailing superyacht M5 at Pendennis | Boat International
89m mast re-stepped on sailing superyacht M5 at Pendennis
2013-10-20By Malcolm MacLean

Last week, the 75.2m sailing superyacht M5 left the Pendennis facility at dawn for Queen’s Wharf at Falmouth Docks in preparation for her towering 89m mast to be hoisted back into place. This is just one milestone during the major refit of the Ron Holland-designed sloop, which has been with Pendennis since spring 2012 for an extensive overhaul programme. Holland is also responsible for her redesign.

Marine Results, who were commissioned to install M5's original mast, managed the stepping of the main mast of the world's largest sloop yacht. Ed Danby, Director of Marine Results, explained the complexity of the operation, 'The primary crane, provided by Ainscough Cranes with a lifting load of 1,000 tonnes, is one of only two in the UK capable of this operation. As the mast stepping required lifting to three hundred feet in the air, it was crucial that the wind was less than 10 knots. The mast was hoisted at dusk whilst there was still just enough light to ensure the mast was safely vertical. It then took five cranes, supported by a team of over thirty people, five hours to complete the complex procedure.'

When the yacht originally arrived at Pendennis as Mirabella V, the mast and rigging weighed more than 45 tonnes. Although the mast and spreaders have remained original, the 34 new carbon fibre stays have been constructed with built-in dynamic fibre optics displaying the load through a central computer. This change has reduced the weight of M5’s rig by an extraordinary 18 tonnes.

While the rig has lost weight, it is estimated there has been a gain in strength of as much as 30 per cent. A lighter rig up top called for a reduction in the keel weight below, and to further improve sailing performance, Ron Holland Design's calculations required 60 tonnes to be removed from M5's keel, which also balances out her stern and interior modifications that added to the overall weight.

The new rig will be tested in full during M5’s sail trials scheduled for early November.

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