Raytheon Autohelm ST4000+ Autopilots Service Manual
 Here is PDF version of the ST4000+ service manual (1.5 MB) pdf doc ......
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Running Rigging Upgrades
 So you are thinking up upgrading your running rigging, but what should you spend your money on to get the most benefit? more .......
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Ropes
Here is a copy of the Marlow Ropes booklet on rope types, selection and splicing. Warning! - this is a large file (2.5MB) pdf doc .......
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Splices
Here is a copy of the Marlow Splicing booklet. Warning! - this is a large file (1MB) pdf doc .......
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31.7 Polars
Here is a collection of Polars for the 31.7 more .......
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31.7 Owners Guide
Here is a pdf copy of the owners guide for the 31.7 pdf doc .......
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First 31.7 Technical Diagrams
Ancasta have very kindly made available the diagrams for the 31.7 to assist with boat maintainace and ordering of spares. more .......
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Rig Set-Up?
If you are new to racing the 31.7 we have pulled together a basic rig tuning guide to get you started. more .......
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Feeling Tense?
Two accurate tables for converting betwen different models of Loos Tension Guages. Metric and Imperial
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Know Your Current Rig Set-Up?
Having invested in a fibreglass tape measure and a Loos tension guage I can now bring you the rig set-up of all the First 31.7s I managed to get my hands on. excel doc .......
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Banks Sails 31.7 Tuning Guide
This has come out of the woodwork from a few years back. If you ignore the rake and boom measurements then this is a pretty reasonable start point. word doc .......
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What sails do I need to start racing?
Sails are an interesting and usually expensive topic and the sail makers will likely as not give you a great story on what to spend your hard-earned cash on more .......
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Twist or Attack?
The wind is up and it is time to de-power the mainsail, so are you going to Twist-off or change the Angle of Attack of the mainsail. There are numerous articles on sail trim which will undoubtedly explain this better than I can, but I'll attempt to give a brief description of each method... more ....... 
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Boat Modifications
When we first converted our 31.7 Electra from a cruiser to a racer back in November 2004, I remember being baffled by loads of minor details which now in hindsight seem obvious. more .......
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Bearing Off?
If you are feeling a vibration on the tiller on your 31.7 when under engine it might be that the lower rudder bearing needing some TLC. more .......
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Got Enough Pre-Bend?
Pre-bend is put into a mast to help prevent it inverting downwind and help the backstay de-power the top part of the mainsail. more .......
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