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St John’s river Weather

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Crew Positions and Tasks

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Trim documents

J30 tuning guide

From the Illustrated Sail & Rig tuning of Ivar Dedekam. This is a scanned book that I have. Each section’s content is described below.

General_trim_1 

  • Aerodynamics – 3
  • Apparent wind – 5
  • Points of Sailing – 6
  • Sail Shape – 8
  • Trim Device – 10

General_trim_2

  • Miscellaneous – 12
  • Genoa trim – 13
  • Stability – 20
  • Balance – 21
  • Mainsail trim – 23

General_trim_3

  • The interaction of the sails – 28
  • Reaching and running – 30
  • Marking / Miscellaneous – 32
  • Trim examples – 36
  • Reefing – 38
  • Problems / Solutions – 39
  • Summary – 40

Downwind_trim

  • Trimming the Spinnaker – 43
  • Types of spinnakers – 44
  • Equipment & terms – 45
  • Preparing the spinnaker set – 46
  • Hoisting the spinnaker – 47
  • Spinnaker pole angle – 48
  • Spinnaker pole height – 48
  • Spinnaker depth – 49
  • Running – 51
  • Reaching – 52
  • Broaching – 53
  • Steering in heavy airs – 54
  • Gybing the spinnaker – 55
  • End to end gybe – 55
  • Two pole gybe – 56
  • Dip pole gybe – 57
  • Taking down the spinnaker – 58
  • The Gennaker – 59

Rig Tuning

  • Rig types – 62
  • Athwartship tuning – 62
  • Fore and aft tuning – 63
  • Backstay tension – 64
  • Tensioning wire and rod – 65
  • Tensioning the cap shrouds – 66
  • Pre-bending the mast – 67
  • Keel stepped masts – 68
  • Maximum mast bend – 69
  • The fractional rig – 69
  • Tuning under sail – 71
  • Straighten the mast sideways – 72
  • Adjusting the lower shrouds – 73
  • Multiple spreaders – 74
  • Tuning diagram – 76
  • Miscellaneous – 77
  • Why pre-tension? – 78