ASYMMETRICAL SPINNAKERS
A6 Heavy Air Spinnaker — The Storm Runner
Designed for heavy-air running, the A6 delivers reliable performance when conditions get rough. Also known as a “Storm Spinnaker” or “Chicken Chute,” the A6 excels running in 20–35 knots of true wind.
Why add an A6 Heavy Air Spinnaker?
The A6 is a versatile heavy-air asymmetrical spinnaker designed for running in strong winds. It is capable of reaching, but it’s fuller shape is optimized for running when conditions are too heavy for standard downwind kites. Built from durable, heavy-duty nylon, the A6 resists distortion and handles repeated collapses and fills, making it ideal for offshore racing or any scenario where reliability in rough conditions is critical. Its size and shape also make it manageable in heavy air while still delivering powerful performance.
Heavy-Air Workhorse
Built for 20–35 knots true wind
The A6 keeps you powered-up and in control while sailing downwind in serious breeze, maintaining drive and stability when other sails would be overpowered.
Durable Construction
Heavy 2.2 oz. nylon
Designed to be virtually indestructible, the A6 uses robust materials that can handle the punishment of offshore running conditions and extended use.
Matrix Construction
Radial panel layout
UK’s Matrix construction features narrow panels oriented to align cloth threads with primary loadpaths, creating the strongest sail for its weight while minimizing distortion.
Understanding Matrix Construction
The key to faster spinnakers lies in their construction. UK Sailmakers uses a Matrix panel layout—a radial design made up of narrow panels aligned with the sail’s primary load paths. Panels radiate from the head, tack, and clew, joined by vertical Matrix panels through the midsection. This layout minimizes distortion and delivers the strongest, most efficient sail for its weight.
Each panel is shaped on all sides to create a smooth, round sail. For one sail to be so versatile, a spinnaker must hold its designed shape without distortion. Distortion is most noticeable when close reaching. Spinnakers made from generic nylon tend to stretch through the middle, which causes the leeches to harden or hook. This reduces driving power, increases drag, and adds heel. The most effective way to prevent distortion, without using a heavier fabric, is to build the sail from performance nylon spinnaker cloth. These materials provide the strength and stretch resistance of standard nylon that is one weight heavier
FAQs
Why is it called a “Chicken Chute” or “Storm Spinnaker”?
The A6 has earned nicknames like “Storm Spinnaker” and “Chicken Chute” because it’s designed for conditions where most sailors would reef down or drop their full-sized kites. It’s your go-to when the breeze pipes up to 20+ knots, but you want to keep on running.
Should I carry an A5 or A6?
Most boats do not carry both sails. Choosing the right one depends on your existing inventory and how much running you expect to do in heavy conditions. The A5 is the more versatile option, capable of performing well on tight reaching angles while also handling running in strong winds.
Do I need a spinnaker net with an A6?
For offshore racing, we generally recommend pairing an A6 with a spinnaker net for added security and control in challenging conditions. For inshore racing, it’s less critical but still good practice in heavy air.
How much smaller is an A6 compared to a standard spinnaker?
A6 sails are typically about 22% smaller than full-sized spinnakers—shorter on luff, foot, and leech. This makes them more manageable in heavy conditions while still delivering excellent downwind performance.
