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14 Pack Air-Flow Tells

Part #: Z4090
$7.99
With seven red tells and seven green tells, you can make sure you have the proper sail shape. Light weight rip-stop nylon fabric for superior sensitivity.
Applied to your head sail and the main the tells will "show" you the air flow.

When you trim the sail: To achieve a good laminar flow across both sides of the sail, both ribbons stream aft. If they aren't streaming aft, the sail trim is incorrect.

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