j105 one design sails
The Ultimate Sails team has been sailing in the J105 class since the first boats arrived in the UK. We co-owned our own boat for a few seasons and by sailing it regularly and making progressive improvements with each new sail we have been able to come up with a package that takes the boat through the full wind range without compromise. This understanding has not only allowed us to produce fast sails that suit the characteristics of the boat but also to improve the durability and help them to be fast for longer. Our J105 designs have won the J Cup and the National Championships.
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Construction
J105 Class sails are constructed with primary Fibres of Black Aramid which gives good balance between shape retaining strength and performance. Durability is increased with the addition of a technora X ply scrim and extra leech fibre passes.
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Mainsail
The mainsail must be an incredibly versatile sail to go from three to 25 knots of wind and still provide power downwind. By tailoring the luff curve and seam shape to match the flexible aluminium rig and our tuning guide this sail can be manipulated to suit the full range of sailing conditions whilst providing a wide groove. We've also recently introduced new fibre layouts to help support the aerodynamic shape of the sail over the full range of backstay tensions.
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Class Mainsail
Construction type: Membrane Lightwave
Surface type: UV film (Platinum option)
Fibre type: Black Aramid
Fibre DPI: 14000
Wind range: 0 – 35 kts true
Standard Features
- Top full length batten & tapered leech battens
- Sail bag
- Cunningham
- Vectran leech and foot lines
- Trim stripes
- Sail numbers
- Tell tales
- Velcro clew strop
- Class logo
- Race measurement
- Class reef
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Headsails
The J105's non overlapping Jibs set on a furler create a potential performance sapping factor called the “end plate effect. This is where the aerodynamic efficiency of a sail is reduced whenever there is a gap between the foot of the sail and the deck allowing air to escape underneath. Most J105 headsails don’t have enough foot round and the result is a gap between the sail and the deck and a less efficient sail.
Ultimate Sails J105 Jibs are designed with more foot round than normal which forces the air to travel up over the sail at all times and gives a resultant increase in performance. Scientific tests have shown that the aerodynamic efficiency of a sail is increased by between 5% and 7% when the gap between the foot of the sail and the deck is closed. You really see the difference when accelerating out of a tack, get into a tacking battle with anyone using our latest designs and there will only be one winner!
The vertical profile of the J105 AP Jib needs to be very fair to maximize the wind speed range in which the sail operates. We've refined this profile to ensure that the sail generates maximum power in light winds but can then be flattened using a combination of sheet and halyard tension for strong winds. We've also introduced new Fibre layouts with increased fibre content (DPI) to help the sails hold their shape at the top of the wind range. Vertical battens support the leech efficiently and are the most reliable and cost effective solution for sails which are furled.
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Class Jib Code 2 AP
Construction type: Membrane Lightwave
Surface type: UV film (Platinum option)
Fibre type: Black Aramid
Fibre DPI: 12000
Wind range – 6 - 20 kts true
Standard Features
- Vertical Tapered leech battens
- Double zip deck launch bag
- Vectran leech and foot lines
- Trim stripes
- Tell tales
- Race measurement
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Class Jib Code 3 ORC
Construction type: Membrane Lightwave
Surface type: UV film (Platinum option)
Fibre type: Black Aramid
Fibre DPI: 14000
Wind range – 18 - 25 kts true
Standard Features
- Vertical tapered leech battens
- Double zip deck launch bag
- Vectran leech and foot lines
- Trim stripes
- Tell tales
- Race measurement
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Asymmetric
The biggest change in sail design during the life of the class has undoubtedly been in the downwind sails and we’ve been at the forefront of these developments. Class rules limit the J105 to one masthead and one fractional asymmetric so its important that the masthead sail works through a wide wind speed and wind angle range.
The Ultimate sails j105 masthead asymmetric is very stable and the luff rolls well to windward to allow you to sail deeper angles in light and medium conditions. This combined with stepped construction (0.9oz nylon in the high load luff area) and maximum twist in the top leech increases acceleration and helps to promote early planing for a great all round sail.
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Class Asymmetric Code 2 MH
Construction type: Tri optimal
Material: 0.75 / 0.9oz Nylon
Apparent wind angle range: 50 – 150 deg
Apparent wind speed range: 0 – 13 kts
Standard Features
- Sail numbers
- Deck launch bag
- Vectran Luff line
- Race measurement
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Class Asymmetric Code 4 FR
Construction type: Tri optimal
Material: 1.5oz Nylon
Apparent wind angle range: 80 – 140 deg
Apparent wind speed range: 10 – 20 kts
Standard Features
- Sail numbers
- Deck launch bag
- Vectran Luff line
- Trim stripes
- Race measurement
- Tack prodder
- Take down patches
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