Running rigging specification

Below are recommended lengths and materials for the running rigging (sheets and halyards) on a Mirror dinghy (both traditional gunter rig with a gaff and the more modern Bermuda rig).

A piece of specta core rope with a black 16 plait polyester cover

In general the MCA recommends the use of modern, high performance ropes with a dyneema/spectra, Vectran or kevlar core (such as Marlow Ropes Excel Racing) to minimize stretch.

  • Jib halyard - 8 metres of 3mm or 4mm diameter dyneema/spectra, Vectran or kevlar with polyester cover.
  • Jib sheet - 6 metres of 6mm diameter line with 8 or 16 plait matt polyester cover. 5.160 metres is the minimum length if you are trying to save weight etc.
  • Main halyard (bermuda mast) - 11 metres of 4mm dyneema/spectra or kevlar with polyester cover.
  • Main halyard (gunter mast with a gaff) - 8 metres of 4mm dyneema/spectra, Vectran or kevlar with polyester cover.
  • Main sheet (centremain with purchase on bridle) - 8 metres of 8mm diameter line with 8 or 16 plait matt polyester cover.
  • Main sheet (traditional aft mainsheet system) - 6 metres of 8mm diameter line with 8 or 16 plait matt polyester cover.
  • Spinnaker halyard & retriver line (cleat on aft edge of daggerboard case) - 11.580 metres of 3mm dyneema/spectra or kevlar with polyester cover.
  • Spinnaker pole downhaul (Flyaway pole system on Bermuda mast) 4.3m of 3mm dyneema/spectra line with a knot inside the mast to limit how high the pole can rise, then 1.5m of 5mm elastic (lengths TBC) running up to the masthead fitting. Joining the elastic to line with a knot can cause the downhaul to jam from time to time, so the pole cannot be deployed. Joining the line to elastic by sewing may improve the situation (TBC).
  • Spinnaker pole uphaul (Flyaway pole system on Superspars Bermuda mast with cleat on mast) - 5.330 metres of  3mm dyneema/spectra or kevlar with polyester cover.
  • Spinnaker sheet - 13 metres of 4mm or 5mm diameter dyneema/spectra with 8 or 16 plait matt polyester cover. It can be difficult to source this combination, so you may have to use a line with a normal polyester cover.

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