ASA and PSIA Instructor
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cal 34 - double headsail modification
The primary purpose of an inner forestay is in fact to fly the storm jib whose use would of course be above 30 knots. Being in the way is not as issue as you don''t leave the inner forestay rigged, you keep it back at the mast unless you anticipate an immediate need to use it.
Hopefully tgeorgeson can clarify what problem he wants to solve, but a removeable inner forestay is an effective sail plan for a storm jib.