WingHopper · Designer · Guide · Sections · Reef · Methods · Pricing · FAQ

Templates

Where each starting point comes from. A template sets the outline, the foil and the fin box together; pick the nearest one and reshape it.

15 of the 19 templates are anchored to a fin a maker publishes dimensions for. The base, depth and sweep are that fin's, and the outline fullness is tuned so the area lands within 5% of the published figure. The fin validation gate fails the build if one drifts past 10%. Foil thickness is never published by any brand, so those values are ours, inside the ranges fin makers discuss (surf fins around 6 to 8 mm; windsurf 8 to 12% of chord; weed deltas 4 to 5% thin or 12 to 15% thick).

The research behind these, with every source, is in the repository under docs/fin-research.

The set

Template	Base	Depth	Sweep	Foil	Thickness	Box	Area as built	Published area
Thruster side	4.37 in · 111 mm	4.55 in · 116 mm	33.7°	flat	7 mm	FCS dual tab	15.2 in² · 98 cm²	14.8 in² · 96 cm² (FCS II Performer M)
Thruster center	4.36 in · 111 mm	4.55 in · 116 mm	33°	50-50	7 mm	FCS dual tab	15.1 in² · 98 cm²	15.1 in² · 98 cm² (Futures F6 centre)
Thruster, upright	4.34 in · 110 mm	4.57 in · 116 mm	31.9°	flat	7 mm	FCS dual tab	15.1 in² · 97 cm²	15.0 in² · 97 cm² (FCS II Reactor M)
Thruster, raked	4.54 in · 115 mm	4.47 in · 114 mm	37°	flat	7 mm	FCS dual tab	15.0 in² · 96 cm²	15.0 in² · 97 cm² (FCS II Carver M)
Quad rear	4.09 in · 104 mm	4.26 in · 108 mm	32.4°	80-20	6.5 mm	FCS dual tab	13.1 in² · 84 cm²	12.6 in² · 81 cm² (FCS II Performer quad rear M)
Side bite (2+1)	3.63 in · 92 mm	3.70 in · 94 mm	32.4°	flat	6 mm	FCS dual tab	10.0 in² · 65 cm²	10.3 in² · 66 cm² (True Ames Side Bite 3.7)
Twin	5.06 in · 129 mm	5.56 in · 141 mm	32.1°	flat	7.5 mm	FCS dual tab	21.5 in² · 139 cm²	21.1 in² · 136 cm² (FCS II MR Twin)
Twin keel	7.24 in · 184 mm	5.24 in · 133 mm	38°	flat	9 mm	Futures	26.1 in² · 169 cm²	26.2 in² · 169 cm² (True Ames Hobie Fish keel)
Mid-length single, 7.5"	5.94 in · 151 mm	7.56 in · 192 mm	38°	50-50	10 mm	US / longboard box	32.0 in² · 206 cm²	not published
Longboard pivot, 9.75"	7.28 in · 185 mm	9.76 in · 248 mm	27.7°	50-50	11 mm	US / longboard box	52.1 in² · 336 cm²	52.1 in² · 336 cm² (FCS II Pivot II 9.75)
Longboard flex, 9"	6.93 in · 176 mm	9.13 in · 232 mm	40°	50-50	10 mm	US / longboard box	45.1 in² · 291 cm²	not published
Wave single, 22 cm	4.53 in · 115 mm	8.66 in · 220 mm	30°	50-50	10 mm	US / longboard box	28.4 in² · 183 cm²	28.2 in² · 182 cm² (MUF X-Wave 22 (interpolated))
Freestyle, 19 cm	3.74 in · 95 mm	7.48 in · 190 mm	12°	50-50	9 mm	Power Box	20.7 in² · 134 cm²	21.7 in² · 140 cm² (Unifiber Freestyle Pro G10 19)
Freewave, 23 cm	4.53 in · 115 mm	9.06 in · 230 mm	22°	50-50	10 mm	Power Box	32.2 in² · 208 cm²	32.6 in² · 210 cm² (MFC Freewave G10 23)
Freeride, 38 cm	4.65 in · 118 mm	14.96 in · 380 mm	14°	50-50	11 mm	Power Box	55.1 in² · 355 cm²	55.3 in² · 357 cm² (MUF X-Ride 38)
Slalom, 40 cm	4.41 in · 112 mm	15.75 in · 400 mm	10°	50-50	10 mm	Tuttle / Deep Tuttle	57.4 in² · 370 cm²	58.9 in² · 380 cm² (MUF Slalom-Race 40 (interpolated))
Weed delta, 22 cm	10.04 in · 255 mm	8.66 in · 220 mm	55°	50-50	11 mm	Power Box	62.6 in² · 404 cm²	64.8 in² · 418 cm² (MUF Delta 22)
Weed delta, thick, 22 cm	8.27 in · 210 mm	8.66 in · 220 mm	52°	50-50	28 mm	Power Box	54.1 in² · 349 cm²	not published
Weed speed, 28 cm	5.91 in · 150 mm	11.02 in · 280 mm	40°	50-50	12 mm	Tuttle / Deep Tuttle	49.5 in² · 319 cm²	not published

Sources and notes

Thruster side: evo.com product page: base 4.37 in, depth 4.55 in, 14.81 in², sweep 33.7°.
Thruster center: evo.com: base 4.36 in, height 4.55 in, 15.13 in², symmetric foil.
Thruster, upright: evo.com: base 4.34 in, depth 4.57 in, 14.96 in², sweep 31.9°.
Thruster, raked: cleanlinesurf.com: base 4.54 in, depth 4.47 in, 14.96 in², sweep 37.0°.
Quad rear: evo.com: base 4.09 in, depth 4.26 in, 12.63 in², sweep 32.4°, 80/20.
Side bite (2+1): trueames.com: base 3.63 in, height 3.70 in, 10.25 in².
Twin: surffcs.com: base 5.06 in, depth 5.56 in, 21.06 in², sweep 32.1°, flat.
Twin keel: evo.com: base 7.25 in, height 5.25 in, 26.16 in², flat; Futures keels publish 3.0 to 4.0° cant.
Mid-length single, 7.5", shape note: Base and depth from the True Ames Greenough 4-A 7.5 (5.95 x 7.55 in, realwatersports.com size table). Its 26.86 in² is not reachable with the sliders: the outline generator cannot make a neck that narrow, so this lands about 19% larger. Drag the Curves in to match. Sweep is our choice.
Longboard pivot, 9.75": surffcs.com: base 7.29 in, depth 9.75 in, 52.08 in², sweep 27.7°, 50/50.
Longboard flex, 9", shape note: Base and depth from the True Ames Greenough 4-A 9.0 (6.93 x 9.14 in, realwatersports.com size table). Its 36.13 in² is not reachable with the sliders; this lands about 25% larger for the reason above. Drag the Curves in to match. Sweep is our choice.
Wave single, 22 cm: easy-surfshop.com size table: 137 cm² at 18 cm to 298 cm² at 32 cm, about 11.5 cm² per cm; 22 cm read off that line.
Freestyle, 19 cm: unifiber.net: 15/17/19 cm at 110/124/140 cm².
Freewave, 23 cm: roho.co.uk listing: 21/23/25 cm at 193/210/229 cm².
Freeride, 38 cm: Maui Ultra Fins spec chart: X-Ride 38 cm, 357 cm².
Slalom, 40 cm: easy-surfshop.com size table: 149 cm² at 20 cm to 438 cm² at 46 cm; 40 cm read off that line.
Weed delta, 22 cm: easy-surfshop.com: Delta 20 at 350 cm², Delta 22 at 418 cm², 55° rake; 3.5 to 5% thickness per boards.co.uk.
Weed delta, thick, 22 cm, shape note: Shape from the designer's own description of the cast-aluminium WA weed deltas: 50 to 55° rake over an elliptical outline, 12 to 15% thick, about 30 mm at the root on a 22 cm fin. No area is published. The root flange, root trailing-edge cutout and bolt holes those fins carry are not modelled yet.
Weed speed, 28 cm, shape note: Category dims only: weed speed fins are sold at 28 to 42 cm in 40° and 50° rakes at about 9% thickness. No maker publishes an area.

What is not here yet

Windsurf thruster and quad sets. Their Slot box and Mini Tuttle mounts are not modelled.
Formula and race fins from 56 to 75 cm. The depth slider ends at 55 cm.
Root flanges, root trailing-edge cutouts, bolt and stiffener-rod holes, and a trailing-edge slot for a sheet insert. All asked for by people printing weed fins; none built yet.

Next: Outline