Viper 640 Class Info
The Viper class is gaining momentum, and Quantum’s class sails are at the front of the fleet. Our tested sail designs coupled with expert rig-tuning advice can help you meet your next challenge.
The Viper is a dynamic rig to sail. Because of that, our tuning guide is strictly that a guide. Created for a newer mast and crew of 570 lbs., you’ll want to let the Quantum tuning guide be your work-in-progress as you get it just right for your team. Don’t hesitate to call your Quantum expert for help.