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Asymmetrical spinnakers

Spinnaker Coding Explained: Most spinnakers fall into five mold shapes to suit different wind speeds and wind angles. In the 1-5 numbering system, the even numbers designate running shapes and the odd numbers are reaching sails. Lower numbers designate lighter wind sails and higher numbers are for higher wind speeds. Code Zeros were invented after the original numbering system and they are very flat spinnakers for light air close reaching; they are a must on boats with non-overlapping genoas. 


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CODE ZERO LIGHT AIR REACHING A1 LIGHT AIR REACHING A2 LIGHT AIR RUNNING A3 MEDIUM AIR REACHING A4 MEDIUM / HEAVY RUNNING A5 HEAVY AIR SPINNAKER
Description: Description: Description: Description: Description: Description:
Light Air Asymmetrical reaching sail that meets the minimum definition of a spinnaker. While it is a very small spinnaker, it is nearly three times the size of a light No. 1 on a boat with non-overlapping genoas. Light Air Reaching Asymmetrical Spinnaker. In the past would have been called a VMG spinnaker. Used in winds to light to sail deeper than 110 degrees AWA. Light/Medium Air Running Asymmetrical. Full size with big shoulders designed to rotate to windward of the headstay at deep angles. Medium Air Reaching Asymmetrical Spinnaker. Wider and deeper shape than the A1. Yet narrower and flatter than the A2 and A4. Medium/Heavy Running Asymmetrical Spinnaker. Smaller shoulders than A2, yet still designed to rotate to windward at the headstay at deeper angles. Heavy Air Reaching Asymmetrical Spinnaker. Short on the hoist, or flown from the hounds instead of the masthead on a fractional rig.
Apparent Wind Speed: Apparent Wind Speed: Apparent Wind Speed: Apparent Wind Speed: Apparent Wind Speed: Apparent Wind Speed:
0 – 10 knots 0 – 10 knots 8 – 18 knots 10 – 20 knots 14 – 30 knots 20 – 35 knots
Apparent Wind Angle: Apparent Wind Angle: Apparent Wind Angle: Apparent Wind Angle: Apparent Wind Angle: Apparent Wind Angle:
45 – 70 degrees 70 – 110 degrees 105 – 155 degrees 75 – 130 degrees 115 – 155 degrees 115 – 155 degrees
Materials: Materials: Materials: Materials: Materials: Materials:
Light laminate or 1.5 oz. nylon .5 oz. nylon .6 to .75 oz. nylon .9 to 1.5 oz. nylon .9 to 1.5 oz. nylon 1.5 to 2.2 oz. nylon

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