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I believe for the tri fin setup I order #2 canted fins and they come automatically 1 left and 1 right and order #1 0 canted fin for the center fin? Correct?
Yes that is correct. The FCS II fin boxes come in a set of left and right side fins, the center fin box has no cant built in (0 degree cant)
Which quantity and degree should I purchase for a standard thruster shortboard
The degree of cant in the fin box depends on how you want the board to perform.
Choose 5 degree fin cant for faster, down the line surfing. Choose 9 degree fin cant for more turning ability as the fin pivots quicker at a higher degree.
You'll need a 0 degree centerfin box too of course for the tri fin set.
For quad fins choose 9 degree for the front fins and 5 degree or 3 degree for the rear fins depending on your speed vs. turning preference.
More info on fin cants, toe in, and positions on a surfboard can be found in our Surfboard Design Guide.
which degree do you think i should get for a retro twin fin
Use 3 degree cant FCSII fin boxes for a retro keel fins
How would FCSII system be installed on a board with a dark pigmented bottom?
Yes install the FCS II fin boxes after laminainting the board with pigment then laminate a 4 oz fiberglass tail patch with clear resin over them.