24 CRUISER & RACER SERIES M-RIG MAX – SYNTHETIC FIBRE STANDING RIGGING FOR THE CRUISER / RACER M-Rig Max uses Dyneema’s DM20 Max Technology yarn. DM20 exhibits zero creep meaning that it lends itself for use as super lightweight standing rigging. Every kilogram saved aloft equates to a 5-7kg saving at the keel, as well as reduced pitching in a head sea. Marlow’s M-Rig Max brings creep free fibre standing rigging within reach of everyday yachtsmen. Traditionally, fibre standing rigging has been incredibly expensive. Thanks to the use of Zylon® (PBO) in a custom-made cable configuration. M-Rig Max uses DM20 and Marlow’s Max Pre-Stretching technology to produce a rope that is available to any rigger on a reel. 1.Measure the rig 2.Cut M-Rig Max to length 3.Use simple locking D12 Splice with lashing thimbles 4.Secure and tension using Marlow Lashline (page 14) The lower modulus of Dyneema® DM20 means that even with Marlow’s Max Pre-Stretching, to match the stretch exhibited by wire (as measured by mm/mm/1000kg) a larger diameter will be required. The table also demonstrates that not only is M-Rig Max lighter, it is also 5x stronger than wire for a given stretch factor. Significant strength advantage means that if the initial elastic elongation experienced by Dyneema can be managed (see page 8), a smaller diameter of M-Rig Max can be specified. The choice of M-Rig Max diameter is a balance between ultimate strength and manageable elongation. CONSTRUCTION: 12 strand MATERIAL: Dyneema® DM20 EXTRAS: Marlow’s Super Pre-Stretch process, ArmourCoat FEATURES: Ultimate low creep, light weight rope. DIAMETER (mm) 2.5 3 4 5 6 7 8 9 10 11 12 13 15 17 BREAK LOAD (kg) 902 1350 2220 2870 4110 6740 8430 9690 11300 13600 16200 19000 23700 29500 WEIGHT (kg/100m) 0.45 0.68 1.11 1.56 2.23 3.56 4.45 5.40 6.30 7.55 9.00 10.7 13.4 18.4 M-Rig Max’s top benefit is minimal creep ideal for standing rigging and steering lines. Add an MGP cover or light weight chafe cover for high wear applications such as lifelines. M-RIG MAX M-RIG MAX CASE STUDY Yacht: J-Boats J97 – 30’ Cruiser Racer Standard rigging. SECTION MATERIAL mm/ mm/100kg MBL (kg) MASS g/m LENGTH (m) QTY FORESTAY -10 Rod 0.00200 4,670 249 12.99 1 TOP SHROUDS 7mm Compact Strand 0.00190 4,910 260 12.56 2 LOWERS 7mm Compact Strand 0.00190 4,910 260 4.82 2 INTERMEDIATE 6mm Compact Strand 0.00259 3,550 194 9.03 2 BACKSTAY 5mm 1x19 Stainless 0.00463 2,000 122 11.00 1 BACKSTAY V 5mm 1x19 Stainless 0.00463 2,000 122 3.72 2 TIE ROD 5mm 1x19 Stainless 0.00463 2,000 122 0.53 1 Total standing rigging weight: 18.09 kg (excluding terminations) Discussions with the rigger suggest than approximately 50% additional elongation within the rig is acceptable and manageable. Windage is not an issue, therefore M-Rig Max is specified as follows: SECTION MATERIAL mm/ mm/100kg MBL (kg) MASS g/m LENGTH (m) QTY FORESTAY 11mm M-Rig Max 0.00313 12,618 75.5 12.99 1 TOP SHROUDS 11mm M-Rig Max 0.00313 12,618 75.5 12.56 2 LOWERS 11mm M-Rig Max 0.00313 12,618 75.5 4.82 2 INTERMEDIATE 10mm M-Rig Max 0.00376 10,518 63 9.03 2 BACKSTAY 7mm M-Rig Max 0.00630 6,272 35.6 11.00 1 BACKSTAY V 7mm M-Rig Max 0.00630 6,272 35.6 3.72 2 TIE ROD 7mm M-Rig Max 0.00630 6,272 35.6 0.53 1 Total standing rigging weight: 5.47 kg (excluding terminations) Our case study shows that by using M-Rig Max the total standing rigging is 70% lighter, saving 12.62 kg aloft, but is nearly 3 times as strong as the equivalent wire/rod rig. If the rigger is able to manage the initial elastic elongation when installing M-Rig Max and the mast can manage the increased deflection during gusts, smaller diameters can be specified, further reducing both weight and windage. In our example above, a further 1.8 kg can be reduced from the rig by specifying M-Rig Max 2mm smaller. A saving of 14.41 kg in the rig is equivalent to shaving 100kg off the bulb – and the rigging is stronger than with wire.
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