‘Because of the DSS system, the rig is designed and built based on 30 per cent of additional righting moment,’ Hylkema says . ‘Using advanced computer software such as FSI (Fluid Structure Interactions) which calculates interactions between spars, standing rigging and sails until it finds an optimised equilibrium, dozens of rig and sails variations, trim settings and sailing scenarios were validated. There was a lot of interaction between Rondal, Carbo-Link and North Sails.’ ‘The primary variable is mast stability, driven by local and global buckling,’ says Rondal’s sail handling engineer Edoardo Volpe. Rondal optimises the stability of the mast by engineering the section’s size, shape, optimised layout and also by controlling the stiffness properties of the laminate including fibre type and direction. This fulfils the structural stability requirements, keeping the weight low while also complying with classification. Mast tune is the end result consideration throughout the process and the crucial secondary variable is strength.’
One of Rondal’s strong suits is its OOA (Out Of Autoclave) pre-preg manufacturing process – no other company can produce a superyacht mast of 60 metres (or considerably longer) in one piece with no joins, rivets or seams. Rondal’s methodology allows for full length, uninterrupted laminates to be applied with optimised fibre architecture from mast foot to mast head, resulting in consistent, harmonious thickness and strength without the compromise and additional weight of section joining. OOA manufacturing also achieves void content of less than two per cent.
The internal tangs anchoring the mast to its stays were a collaboration between Rondal and Carbo-Link. It’s a neat solution with no threaded fittings and ensures efficient load transfer between rigging and mast. The shimmed tuning process allows for adjustment ranging from 100 to 150mm. Threaded fittings are often the weakest part in the mast and rigging configuration, and if any thread is damaged, the risk for rigging and mast interface replacement is high. To optimise the yacht’s performance while keeping the sail-handling as simple as possible, a joint study between the owner’s project manager Mattia Belleri and Rondal implemented some race- derived custom solutions. ‘To accommodate the huge square-top mainsail in tacks and gybes, we created a backstay crane with a smart system of running backstays and deflectors,’ Hylkema says. ‘This
Above: Canova’s custom- designed solid carbon rigging
package from Carbo-Link includes CL Ellipse laterals with aerodynamic profiles
optimised for broader wind angles; a CL Torque
forestay that furls in both directions with 99 per cent torsional efficiency; and CL Hybrid runners that are solid carbon for most of their length with flexible carbon
sections at the boom interface and at the upper and lower deflector locations. Most of the tuning is done at the diagonals with internal tangs
monitored by built-in fibre optics. Load pins are used for secondary analysis and calibration
makes tacking and gybing quick and easy with a short-handed crew, also in reefed conditions, as the deflectors function as checkstays, but it’s more effective as the deflectors pull back laterally instead of downward as checkstays do. The runner becomes a fixed backstay and the deflectors help control mast bend and stability. This system was optimised for the first reef setting as the main tacks underneath the first deflector. At third reef the main tacks underneath the lower deflector. This system simplifies sail handling especially in heavy conditions.’ Bas Peute of Rondal goes on to explain: ‘Sail handling is controlled by Rondal electric captive winches made almost entirely from carbon fibre, contributing to significant reductions in overall weight. Canova features carbon E captive winches in various sizes from eight to 18-ton pulling load, with maximum holding loads at 1.5 times this. All winches are equipped with load sensors to enable live load monitoring, further enhancing simple sail-handling and overall load awareness’. ‘Carbo-Link’s solid carbon CL Ellipse rigging package for Canova uses cutting-edge technologies recently proven on Imoca 60s, Maxi 72s and Wallycentos,’ says James Wilkinson of Carbo-Link. ‘For this yacht, the aspect ratio of the CL Ellipse laterals is reduced to better suit broader wind angles. Carbo- Link’s toughened resin system, with ultra-low friction and a very high resistance to both impact and chafe, is a major bonus given that Canova’s sail inventory includes a quadrilateral jib with two sheets on each side, doubling the amount of contact with the lateral rigging.’ Canova has shimmed V1 chainplates with tidy, below-deck terminations. The shims account for chainplate and cable length
tolerances, plus tuning adjustments if required. The majority of tuning is done at the diagonals with internal tangs, including the cap shrouds. The V1 and D1 shrouds have integral fibre optics to monitor tuning, with load pins for secondary data analysis and calibration. The primary jib furls around a Carbo-Link CL Torque forestay – also used on yachts such as Saudade and Win Win – rather than a headfoil. Not only does this reduce weight, but also drag as its sectional size is much smaller. The forestay has unidirectional carbon at its core for optimum tensile strength, encased in +/-45° fibres for torsional strength and stiffness and all consolidated into a solid cable. ‘It was specifically designed for
Canova,’ Wilkinson says. ‘The cable can be furled in both directions and drives 99 per cent torsional efficiency during the furl. Unlike other torsional cables, there’s no reduction in torsional efficiency over time.’ To control the mast and sail
shape, Canova uses Carbo-Link’s CL Hybrid running backstays: solid carbon with flexible carbon sections where necessary. This allows the smallest diameter and toughest cable whilst allowing the cable to flex. ‘There are flexible sections at the boom interface to allow cable manipulation when required,’ Wilkinson says. ‘And also flexible sections on the upper and lower deflector locations, which enable greater scope for mast tuning and refinement through various sail configurations.’ As Canova’s sea trials near completion, the best testimonial for the rigging package delivered by Rondal and Carbo-Link is the fact that they’ve already started their next project with Baltic Yachts: rigging the Baltic 145 that’s currently in build and due to launch spring 2021.
www.carbo-link.com
q SEAHORSE 79
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88 |
Page 89 |
Page 90 |
Page 91 |
Page 92 |
Page 93 |
Page 94 |
Page 95 |
Page 96 |
Page 97 |
Page 98 |
Page 99 |
Page 100 |
Page 101 |
Page 102 |
Page 103 |
Page 104 |
Page 105 |
Page 106 |
Page 107 |
Page 108 |
Page 109 |
Page 110 |
Page 111 |
Page 112 |
Page 113 |
Page 114 |
Page 115 |
Page 116 |
Page 117 |
Page 118 |
Page 119 |
Page 120 |
Page 121 |
Page 122
