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Spinlock | Rig Tuning Tips!
Rig Tension Tuning GuideMost people know what their rig settings should be, but don’t know theforces they are putting through the rig and the hull. We will try and help you get a better idea of whatforces you are putting through the rig using the Spinlock RigSense.
We know the fundamental job of standing rigging it to hold the rig up, however we can affect theperformance, safety and longevity of the rig and boat by having the rig over or under tensioned.
To start your rig tuning, you need to get a good starting point. Download the settings from your classwebsite, sailmaker or rig manufacturer. This will show you how to step the mast, adjust the mast so itis straight, with the right amount of prebend and rake (depending on the type of your rig).Downloadour App
We recommend using the Spinlock RigSense App to import, log and share your rig settings. This canbe downloaded for free via the Play Store or Apple App store.
Download the RigSense App for iPhone and iPads
Download the RigSense App for Android phones and tablets Once you have the mast up andset to BASE settings, you can attach your Spinlock RigSense. The numbers at the bottom will be inkilogrammes…but what does this mean?
Wire cable measures its strength by breaking strain, approximate numbers can be found in the tablebelow:Once you have the mast up and set to BASE settings, you can attach your Spinlock RigSense.The numbers at the bottom will be in kilogrammes…but what does this mean?
Wire cable measures its strength by breaking strain, approximate numbers can be found in the tablebelow:
Most dinghy and keelboats with fractional rigging set their cap shrouds to 20% of thebreaking strain of the wire.
For example, if you are using 3mm 1x19 wire, (breaking strain = 790kg) your BASE shroudsetting should be approximately 158kg at 20%.
This might seem a small amount compared to the wire breaking strain, however you mustconsider the strength of the other fittings attaching the wire to the hull and the mast. Overtightening the shrouds will cause a lot of compression through the mast, potentiallycreating permanent damage to the hull (do not exceed 25%).
An under tensioned rig could lead to a mast failure. If you are unsure about the right tension,contact the boat, rig or sail manufacture for more advice.
When measuring the tension of your rig, we recommend the following:Position the boat head to wind, on flat ground with your mainsail down or up (as long as it’s thesame every time).
Always attach the RigSense at the same place, at least a metre away from any terminals. Werecommend eye level with the KG scale, then mark with a permanent marker or electrical tape.
Once attached to the rig, push on the base of the gauge, so the pointer points at 0kg and release.
If adjustments need to be made, this can be done with the RigSense still attached to the rig.
Repeat the other side of the rig to confirm settings. If possible, measure the tension on yourforestay. This will highlight any issues with the rig setup.
Mark your wire or rope for repeatable settings:
Use the RigSense to measure jib halyard tension:Once you are happy with the tension of your rig, head out sailing and see how the boat feels. Ifpossible, sail alongside a similar boat to yours and look at your speed and height compared toyour partner. Here are some common problems relating to incorrect rig tuning: • Sail too full with sail controls on (Kicker, Outhaul Cunningham) – Try more prebend • Not pointing upwind very well – Try more aft rake • Slack leeward cap shroud – Tighten caps shrouds equally on both sides • Mast has an ‘S’ curve – Adjust lowers and intermediates • Excessive slag on the forestay – Tighten forestay/backstay on a masthead rig, tighten cap shroudson a fractional. • Poor performance downwind – Try raking the mast forward • Once you are happy with your performance, log the settings in your RigSense App for easyaccess.
For more information, we recommend the RYA Speed Sail and Rig Tuning DVD or this article byPractical Boat Owner.
*Settings will vary depending on rig type and material.