The Collapsed Cast is a piled leader cast where lots of slack is created in the leader. It is particularly useful for sinking nymphs into fast currents when fishing downstream. It is IMO the most important presentation cast of all.
There are two methods that can be used for collapsing the leader:
- Utilising an open loop by intentionally doming the tip path during the Casting Stroke.
- Using trajectories such that the fly lands close to the fly line.
Both can be done using both Overhead and Roll Casts. Most used, by me anyway, is the Roll Cast combined with Open Loop, which has the advantage that multiple attempts to perfectly position the fly and slack can be easily made without too much drama.
However you should learn both methods for collapsing the leader and you should be able to perform the cast using both Roll and Overhead variations and using both shoulders of course.
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