Segling med asymmetrisk spinnaker

J/109:or kör undanvind på Skandia Cowes Week 2006. Foto: onEdition.

Nytt och kul på J/109 är ju asymmetrisk spinnaker. Ingen ombord har seglat särskilt mycket med sådana så här finns det mycket att lära. Vi skall väl försöka få med folk ombord som har koll och segla på andra båtar. Nedan en del obligatorisk läsning för besättningen på Blur.

Under 2007 kör vi med en allround-gennaker (Quantum Renegade r3) så får vi klura på vad man behöver komplettera med till nästa säsong. Det finns säkert folk som läser blur.se som har synpunkter på vad man behöver :-)

Jag kollade in North U som har en sjysst serie om “Trim Downwind”. Det tydliga budskapet när det gällde trim var “Ease, ease, ease”. Vanligaste felet är att man kör för hårt i både halshorn och skot.

Sailing World har en bra artikel om “The Commandments of Asym Trim”:

1. Thou shall rotate your asymmetric to weather.
2. Thou shall keep the tack line in mind.
3. Thou shall never sail a straight line.
4. Thou shall use your twings only if you must.
5. Thou shall always have and talk about pressure.

Här är några andra bra artiklar:

• 5 Keys to Asymmetric Speed and Teamwork
• Klingler’s Downwind Speed Tips
• The Bowman’s Guide to the Asymmetric
• Mastering the A Sail (pdf)
• Code Zero – The New Way To Close Reach (pdf)

Harken/North Sails Melges 24 Instructional Video:

Segelmakarna har olika kodsystem för att hålla koll på alla varianter…

Quantums Renegade Asymmetrical spinnakers

Reaching sails are r0, r1, r3, r5 and r7. Running sails are designated as r2, r4 and r6. Materials range from Cuben Fibre and other custom composites to more traditional nylon and polyester spinnaker fabrics depending upon application

r 0
This is the sail now generally referred to as the Code Zero.

• 70% of maximum area, and 40% larger than a Genoa.
• Excellent light air performance. The choice for light to moderate air close reaching.
• Great distance racing sail
• TWA of 70-130, AWA of 30-120 depending on girth and velocity.
• Critical for the newest swept-back-spreader rigs with non-overlapping jibs.
• Can be used on a furler
• Foot length typically 168% of SPL
• Mid girth 75% of foot or smaller if rule allows
• Leech length 90% of Luff
• Genoa-like shape

r 1
The r1 is designed as a VMG (velocity made good) sail for tacking downwind. It is typically slightly smaller and flatter in the head sections to optimise light air performance with pole at or near the headstay

• 100% of maximum area.
• TWA 100-150 degrees, AWA of 70-120
• Foot Length 180% of SPL
• Mid girth typically 90-95% of foot
• Leech length 87-90% of Luff
• Flatter specialized shape for light air tacking angles

r 2
The r2 is designed as a light to moderate air sail. It is typically used as soon as the spinnaker pole squared is back from the headstay. 10-22 knots is a normal true wind range.

• 100% of maximum area.
• TWA 130-160 degrees, AWA of 90-145
• Foot Length 180% of SPL
• Mid girth typically 100%of foot or larger is class rules allow
• Leech length 87-90% of Luff
• Full, powerful sections for running, modified slightly to allow for pole on the headstay angles in transition conditions.

r 3
A full sized reaching asymmetrical, it is the best choice when adding an asymmetrical to an existing inventory, since it is as close to an all-purpose sail as possible. It is designed for the middle range of reaching angles in moderate breeze, but as a fullsized sail, it is capable of working effectively at broader angles.

• 100% of maximum area.
• TWA 100-150 degrees, AWA of 80-140
• Foot Length 180% of J
• Mid girth 100% of foot or bigger if rule allows
• Leech length 87% of Luff
• All Purpose Shape

r 4
A full sized, maximum power running asymmetrical, for use with the pole well-squared. Optimised shaping and structure for moderate to heavy air running, typically used in 18-30+ knots of true wind.

• 100% of maximum area.
• TWA 150-180 degrees, AWA of 120-165
• Foot Length 180% of SPL
• Mid girth typically 100% of foot or larger is class rules allow
• Leech length 87-90% of Luff
• Full, powerful sections for running.
• Additional reinforcing and plying for high loads

r 5
Designed for moderate air close reaching and heavy air reaching at broader angles when maximum area is too much. r 5 shapes also work reasonably well in light air at very close angles when a r 0 is not available. Design emphasizes flat, well-twisted shapes with straight exits to reduce heel angle and maximize performance, with balanced, forgiving entry for trimming ease.

• 90% of maximum area.
• TWA 90-160 degrees, AWA 80-150
• Foot length 180% of J
• Mid girth 85%-95% of Foot depending on aspect ratio
• Leech length 88% of Luff
• Reacher shape

r 6
A slightly reduced, maximum power running asymmetrical, for use with the pole well-squared. Optimised shaping and structureb for heavy air running, typically used in 25+ knots of true wind.

• 100% of maximum area.
• TWA 150-180 degrees, AWA of 120-165
• Foot Length 180% of SPL
• Mid girth typically 90-95% of foot
• Leech length 87-90% of Luff
• Full, powerful sections for running.
• Additional reinforcing, plying, and generally bomb-proof construction for maximum loading

r 7
A reduced size asymmetrical designed for extreme reaching conditions. Also used when it’s too scary to put any other spinnaker.

• A sail for the serious offshore inventory.
• TWA 90-160 degrees, AWA of 60-145
• Foot Length 160-180% of SPL
• Mid girth typically 78-85% of foot
• Leech length 87-90% of Luff
• Extremely flat, specialized reaching mould.
• Additional reinforcing, plying, and generally bomb-proof construction for maximum loading

North har ett liknande kodsystem:

CODE 1A:
Light Reach/
VMG Run
70-120 AWA

CODE 2A:
Light Runner
110-150 AWA

CODE 3A:
Medium Reacher
70-120 AWA

CODE 4A:
Medium Runner
110-150 AWA

CODE 5A:
Heavy Reacher
95-130 AWA