Short answer
Most of a furling forestay is enclosed in the foil and cannot be inspected in place. Check the exposed upper and lower terminals, the swivel and drum, and the foil joints for movement. A genuine forestay inspection means removing the furler or unstepping the mast, which is why forestay condition is so often missed.
The forestay usually carries the highest sustained load in the rig and is simultaneously the least inspectable component on a furling yacht. That combination is why it appears so often in failure discussions.
What you can check in place: the upper terminal and masthead attachment, the lower terminal and toggle above the drum, movement or play at foil joints, bearing condition in the drum and halyard swivel, and whether the foil is straight along its length.
What you cannot check in place is the wire itself and the buried portion of each terminal. Any statement about the condition of a furling forestay that was made without removing the foil is an assumption. Plan the real inspection to coincide with work that already requires the furler to come off, such as a re-rig or a furler service.
Because the forestay is the hardest component to verify, many owners replace it with the rest of the standing rig rather than separately. The forestay guide and the furling systems guide cover the trade-offs.
Step by step
Check the ends
Inspect the upper terminal at the masthead and the lower terminal and toggle above the drum for cracking, pitting and alignment.
Test the foil joints
Work along the foil feeling for movement, steps between sections, or loose fasteners at joints.
Turn the system
Furl and unfurl fully. Roughness, binding or noise points to bearing or halyard-wrap problems, not just a stiff line.
Sight the luff
From ahead, sight up the foil for a bend or a lazy curve that does not match the mast rake.
Book the real inspection
Schedule foil removal with a rigger when the mast is already coming out or the furler is already being serviced.
Key facts
- Inspectable in place
- Terminals, toggle, drum, swivel, foil joints
- Not inspectable in place
- The wire inside the foil and the buried part of each terminal
- Real inspection requires
- Furler removal, usually with the mast unstepped
- Common practice
- Renewing the forestay with the rest of the standing rig rather than alone
Full background: read the guide