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Tuning

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roger View Drop Down
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    Posted: 06 October 2004 at 16:43
Can anyone point me to a tuning guide of any sort. New to Hornets and need some help
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kevin View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kevin Quote  Post ReplyReply Direct Link To This Post Posted: 06 October 2004 at 21:24

hope the following might be some use

 

Hornet Tuning Guide

 

The following rig tuning guide was provided by Mark Hazelwood (ex-Hornet World Champion and formerly of Banks Sails). These figures are given as guidelines and should be used as a starting point for your boat. Individual boats will always have minor differences. Therefore these measurements should not be taken as hard and fast rules.

 

Mast

                                                    Epsilon/M2                                              D/M3/M7

Rake                                          23'9.5"/7250mm                                                   23'11"/7290mm

 

Rig Tension                           350-400lb (Genoa luff)                          350lb

 

Spreaders                               Length 420mm                                     430mm

                                                    Deflection 165-185mm                     185-205mm

 

Heel Position                        The front of the mast should be 25mm from the front of the mast                                                                                     gate.

 

Pre-bend                                  0-10mm                                                                      0-25mm

 

It is important that the spreader deflection is set to give the correct pre-bend for your crew weight. Heavier crews should use less pre-bend than lighter crews. All crews will need to pre-bend the mast (increase spreader deflection) in non-trapezing conditions.

All measurements are based on a maximum length mast* and a Goodwin hull. Rake will be approximately 95mm less for a minimum length mast, and 35mm less for a Coombe/Lovett hull. All measurements should be taken with full rig tension on and no deck control on.

 

Mainsail

Top Batten (full length) - Apply sufficient tension to just eliminate vertical creasing along the batten pocket.

 

Cunningham - Use only when overpowered to move draft forward and to open upper leech. Ignore horizontal creases on the mainsail luff, below 12 knots.

 

Outhaul - Generally very tight and ease approximately 75mm downwind. Consider easing slightly when sailing upwind in choppy conditions.

 

Kicking Strap - No tension until mainsheet has to be eased to prevent heeling, then only enough to maintain boom on the horizontal. Use a lot of tension in 15knots+ or when seriously overpowered. In strong winds, use as much as physically possible and play the sheet constantly.

 

Boom Position - Light winds and crew to leeward, boom should be eased off the centreline. Boom should be sheeted on the centreline when helm and crew are both on the same side deck until overpowered, then drop the boom to leeward as the conditions dictate.

 

Deck Control - Limits the amount of lower mast bend and the overall fullness of the sail. Less control gives more mast bend and a flatter sail. More control gives less mast bend and a fuller sail. The actual setting will depend upon the crew weight, wind and wave conditions, and point of sailing.

 

Genoa

Sheeting - Leech should normally be set parallel to the centreline at spreader height. Variations of sheet tension and angles permit the genoa to take on many different aerofoil sections. Many settings can prove fast. In light winds, sheeting firmly along the foot to flatten the base and open the leech. In medium winds and a chop, sheet more down the leech with less sheet tension to produce a more powerful section.

 

Luff Tension - should be sufficient to just remove horizontal creasing and no more. If in doubt, leave slightly loose.

 

The mast measurements allow 105mm variation in height of boom, ie ht. of mainsail can vary vertically 105mm relative to the jib, (the chosen height cannot be changed once the black bands are on). The high boom is the most common, ie the max length mast 760mm between Bands 1 & 2. Check this when comparing rigs.

 

 

 

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roger View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote roger Quote  Post ReplyReply Direct Link To This Post Posted: 07 October 2004 at 10:50

Thanks Kevin. Does the sliding seat as opposed to trapeze make any difference.

 

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Strangler Quote  Post ReplyReply Direct Link To This Post Posted: 08 October 2004 at 19:55

Roger

If its a s-seat boat, ie an old boat, there may be other factors that are of more importance that the sliding seat. Eg the Jib sheeting position is probably further out from centre-line than modern boats.Is it down to weight? Do you know the type of mast? If its an old stiff one the spreaders may need to be altered. The tuning guide is a good starting point. See how it goes.

Strangler

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Post Options Post Options   Thanks (0) Thanks(0)   Quote roger Quote  Post ReplyReply Direct Link To This Post Posted: 11 October 2004 at 13:29
Thanks
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