December 8, 2015
Quantum Expert Answer
A three-sail inventory planned from scratch would probably include a code 2S symmetrical (VMG/AP) for 3-16 knots TWS, a code 4S symmetrical (runner) for 14-30 TWS, and a code 3 (full-size reaching) asymmetrical. Sounds like you have the Code 3 asymmetrical and in all probability your Airx 600 spinnaker is a true all-purpose sail. The sail to add would be a true runner (code 4S), which would give you a full, powerful pure downwind sail. When you replace the light symmetrical spinnaker, it could be made with a slightly lighter air (VMG) orientation.