As most know, the Opti has many spar configurations to choose from depending on sailors, weight, height and sailing abilities. 

This is what Optimax Spars recommends for sailor weights and spar assignments for the sailor

MK3                                 35 – 45 kg                                                            

MK3 mast, 40 mm boom, MK3 sprit

MK3 mast, 40 mm boom, Hyperflex sprit 

MK3 mast, 40 mm boom, Flex sprit              

MK3 mast, 45 mm boom, MK3 sprit Average Opti sailor build 75>85 LBs

MK3 mast, 45 mm boom, Hyperflex sprit- Average Opti sailor build 

MK3 mast, 45 mm boom, Flex sprit

MK3 mast, 48 mm boom, MK3 sprit

MK3 mast, 48 mm boom, Hyperflex sprit

MK3 mast, 48 mm boom, Flex sprit

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MK3 Flex  < 35 kg

MK3 Flex mast, 40 mm boom, Flex sprit

MK3 Flex mast, 40 mm boom, Hyperflex sprit-  Very Short and Very light weight sailor <70LB 

MK3 Flex mast, 45 mm boom, Flex sprit

MK3 Flex mast, 45 mm boom, Hyperflex sprit

MK3 Flex mast, 48 mm boom, Flex sprit

MK3 Flex mast, 48 mm boom, Hyperflex sprit

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MK3Med      30 – 40 kg                         mainly use One Sail  for this configuration  at coaches discretion 

MK3 Medium mast, 40 mm boom, MK3 sprit

MK3 Medium mast, 40 mm boom, Hyperflex sprit

MK3 Medium mast, 40 mm boom, Flex sprit

MK3 Medium mast, 45 mm boom, MK3 sprit

MK3 Medium mast, 45 mm boom, Hyperflex sprit

MK3 Medium mast, 45 mm boom, Flex sprit

MK3 Medium mast, 48 mm boom, MK3 sprit

MK3 Medium mast, 48 mm boom, Hyperflex sprit

MK3 Medium mast, 48 mm boom, Flex sprit

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MK4   > 45 kg

MK4 mast, 45mm boom, MK4 sprit        Tall heavier Opti sailor

MK4 mast, 45 mm boom, MK3 sprit        Tall opti sailor

MK4 mast, 45 mm boom, Hyperflex sprit  

MK4 mast, 45 mm boom, Flex sprit

MK4 mast, 48 mm boom, MK3 sprit

MK4 mast, 48 mm boom, Hyperflex sprit

MK4 mast, 48 mm boom, Flex sprit

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 For the most part, The MK3 mast, 40 mm boom, Hyperflex sprit  for the lighter weight sailors( under 80lbs) and the  MK4 mast, 45 mm boom, MK3/MK4 sprit I for the heavier sailors ( 85 lbs and up) is the most popular configurations on the east coats and down island with minor tweaks depending the YC the sailor belongs to. The 48mm MK5  Boom since is becoming popular on the west coast and with the heavier sailors but the MK4 boom is still the standard go to for sailors above 85 lbs

 

The 40mm MK3 boom( under 80ish LBs) and the 45mm Mk4 boom ( above 85ish LBs) are by far the most popular

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This is the basic rig tune by wind speed:

Wind Range                      0-8 knots                                     8-12 knots                                                   12-16 knots

Mast Rake                       2780 – 2800 mm                     2770 – 2790 mm                                          2770 – 2780 mm

Sprit                                   Wrinkles                                 Some Wrinkles                                               A Few Wrinkles

Vang                          No tension in upwind               Light tension in upwind                                         Tension

Prebender               2 turns /Some Slack at Luff        2 turns / Some Slack at Luff                          No Wrinkle at Luff

Wind Range                       16-24 knots                                                                                     25+ knots

Mast Rake                       2750 – 2760mm                                                                              2790 ±10mm

Sprit                      Wrinkles( I personally think no wrinkles)                        Wrinkles( I personally think no wrinkles)

Vang                              Lots of tension                                                            Cleat with main sheet trimming harder

Prebender                 Tension on Luff                                                                                  Tension on Luff