GSC Spring Series PHRF Declaration Form
Please tell us about your boat:
In order to answer the following questions you will need to know the configuration and dimensions of your boat and its sails.

- "J" is the base of the foretriangle measured along the deck from the headstay to the mast.
- "I" is measured along the front of mast from the highest halyard to the main deck.
- "LP" is the the shortest, or perpendicular, distance from the clew to the luff of the sail.
- "Jib Size (%)" is the length of your Jib's LP (Luff Perpendicular) expressed as a % of your boat's "J" dimension

If you don't know how to calculate your PHRF rating, leave "Proposed PHRF" blank and we will help you once we have all the other information about your boat. Base ratings and adjustments for all GSC boats link:

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Email *
Your Name *
Boat Make and Model *
Proposed PHRF
Rig Type
Clear selection
Jib Size (%)
Engine Configuration
Clear selection
Double Headsail?
Clear selection
Clear selection
Oversize Spinnaker, luff > 0.95 x sq root of (i x i + j x j)?
Clear selection
Oversize Spinnaker Pole, length > j?
Clear selection
Furling Main?
Clear selection
Any Other Performance Altering Modification?
A copy of your responses will be emailed to the address you provided.
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