passing concept
Sail Concept
Sail is a three-level concept (many playbooks call it a flood): three receivers attack one side of the field at three levels to outnumber the defenders responsible for that side.

How Sail Is Built
Crucible's Sail sends a deep pogo route to carry the corner and safety, a sail breaking toward the sideline at 12 yards, and an option route at about 6 yards. Against two defenders to that side, one level is always open.
What Sail Beats
- Cover 3: the post safety and the defender under the sail cannot cover three levels at once.
- Cover 2 Tampa, with the sail landing in the sideline hole behind the corner.
- Rotating coverages that roll away from the Sail side.
How the QB Reads It
Read high to low: the deep defender first, then the defender under the sail. Against Cover 3 that is the post safety, then the strong safety playing the Curl/Flat zone; against Cover 2 Tampa, the curl linebacker under the sail. If that defender sinks and widens under the sail, throw the short route; if it stays low, throw the sail. In Crucible's Sail Dig, you read Sail first, then the Dig on the backside.


