feat: ORC sail variants, ShortKeel appendage, and Daring yacht

dat/Daring/righting_moment.json

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+{
+  "Heel": [0.0, 10.0, 20.0, 30.0, 40.0, 50.0, 60.0],
+  "GZ":   [0.000, 0.120, 0.230, 0.310, 0.350, 0.330, 0.260]
+}

dat/orc/asym_cl_kite.dat

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+# asymmetric spinnaker centerline tack lift and drag coefficients (ORC VPP). first row is awa
+0.02639,,,,,,,,,,,
+0.0000,28.000,41.000,50.000,60.000,67.000,75.000,100.000,115.000,130.000,150.000,180.000
+0.0000,0.19100,0.28000,0.36600,0.52300,0.44800,0.55600,0.75700,0.79000,0.77600,0.62000,0.40000
+0.0000,0.02600,1.01800,1.27700,1.47100,1.51300,1.44400,1.13700,0.82900,0.56000,0.25000,-0.12000

dat/orc/asym_pole_kite.dat

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+# asymmetric spinnaker pole tack lift and drag coefficients (ORC VPP). first row is awa
+0.02639,,,,,,,,,,,
+0.0000,28.000,41.000,50.000,60.000,67.000,75.000,100.000,115.000,130.000,150.000,180.000
+0.0000,0.17000,0.23800,0.30600,0.45900,0.39200,0.49300,0.79100,0.89400,0.93600,0.93600,0.93600
+0.0000,0.08500,1.11400,1.36000,1.51300,1.54800,1.47900,1.20700,0.95600,0.70600,0.42500,0.00000

dat/orc/jib.dat

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+# jib lift drag and lift coefficient (high). first row is awa
+0.016,,,,,,,,,
+0.00000,7.0000,15.0000,20.0000,27.0000,50.0000,60.0000,100.0000,150.0000,180.0000
+0.003,0.05000,0.03200,0.03100,0.03700,0.25000,0.35000,0.73000,0.95000,0.90000
+0.00000,0.00000,1.10000,1.47500,1.50000,1.45000,1.25000,0.40000,0.00000,-0.10000

dat/orc/jib_low.dat

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+# jib lift drag and lift coefficient (low performance rig). first row is awa
+0.016,,,,,,,,,
+0.00000,7.0000,15.0000,20.0000,27.0000,50.0000,60.0000,100.0000,150.0000,180.0000
+0.003,0.05000,0.03200,0.03100,0.03700,0.25000,0.35000,0.73000,0.95000,0.90000
+0.00000,0.00000,1.00000,1.37500,1.45000,1.43000,1.25000,0.40000,0.00000,-0.10000

dat/orc/kite.dat

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+# kite lift drag and lift coefficient (high). first row is awa
+0.02639,,,,,,,,,,,,
+0.0000,28.000,41.000,50.000,60.000,67.000,75.000,100.000,115.000,130.000,150.000,170.000,180.000
+0.0000,0.19152,0.28152,0.35496,0.43920,0.48960,0.53280,0.61920,0.65880,0.67320,0.67320,0.67320,0.67320
+0.0000,-0.02484,0.69437,0.90677,1.04400,1.08000,1.08000,0.95760,0.81360,0.61200,0.32400,0.10800,0.00000

dat/orc/main.dat

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+# mainsail lift drag and lift coefficient (high). first row is awa
+0.01379,,,,,,,,,
+0.00000,7.0000,9.0000,12.0000,28.0000,60.0000,90.0000,120.0000,150.0000,180.000
+0.03448,0.01724,0.01466,0.01466,0.02586,0.11302,0.38250,0.96888,1.31578,1.34483
+0.00000,0.94828,1.13793,1.25000,1.42681,1.38319,1.26724,0.93103,0.38793,-0.11207

dat/orc/main_low.dat

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+# mainsail lift drag and lift coefficient (low performance rig). first row is awa
+0.01379,,,,,,,,,
+0.00000,7.0000,9.0000,12.0000,28.0000,60.0000,90.0000,120.0000,150.0000,180.000
+0.04300,0.02600,0.02300,0.02300,0.03300,0.11302,0.38250,0.96888,1.31578,1.34483
+0.00000,0.86200,1.05200,1.16400,1.34700,1.23900,1.12500,0.83800,0.29600,-0.11207

dat/orc/sym_kite.dat

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+# symmetric spinnaker lift and drag coefficients (ORC VPP). first row is awa
+0.02639,,,,,,,,,,,
+0.0000,28.000,41.000,50.000,60.000,67.000,75.000,100.000,115.000,130.000,150.000,180.000
+0.0000,0.21300,0.32100,0.42500,0.58700,0.59800,0.61900,0.85000,0.91100,0.93500,0.93500,0.93500
+0.0000,0.00000,0.97800,1.24100,1.45400,1.45600,1.43700,1.19000,0.95100,0.70600,0.42500,0.00000

runDaring.py

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+#!/usr/bin/env python3
+"""
+Velocity Prediction Program for the Daring sailing yacht.
+
+The Daring is a one-design keelboat designed by Arthur Robb, based on
+his 5.5 Metre class yacht "Vision" (1956 Olympic silver medal).
+
+Published specifications (classicsailboats.org):
+    LOA: 9.90m | LWL: 7.01m | Beam: 1.98m | Draft: 1.35m
+    Displacement: 2000 kg | Upwind sail area: 29.73 m²
+
+Estimated parameters are documented in docs/plans/2026-02-27-daring-vpp.md.
+All estimates are marked and can be refined with actual measurements.
+"""
+import logging
+
+import numpy as np
+
+from src.SailMod import Jib, Kite, Main
+from src.VPPMod import VPP
+from src.YachtMod import Rudder, ShortKeel, Yacht
+
+logging.basicConfig(level=logging.INFO)
+
+# --- Estimated GZ curve for classic 5.5m ---
+# GM ~0.70m, ~50% ballast ratio, narrow beam (1.98m)
+# See docs/plans/2026-02-27-daring-vpp.md for derivation
+DARING_GZ = {
+    "Heel": [0.0, 10.0, 20.0, 30.0, 40.0, 50.0, 60.0],
+    "GZ":   [0.000, 0.120, 0.230, 0.310, 0.350, 0.330, 0.260],
+}
+
+Daring = Yacht(
+    Name="Daring",
+    Lwl=7.01,       # (published) waterline length
+    Vol=1.95,       # (estimated) 2000kg / 1025 kg/m³
+    Bwl=1.70,       # (estimated) ~86% of Boa
+    Tc=0.45,        # (estimated) canoe body draft
+    WSA=11.5,       # (estimated) Delf series for narrow hull
+    Tmax=1.35,      # (published) max draft incl. keel
+    Amax=0.38,      # (estimated) Bwl × Tc × Cm(0.50)
+    Mass=2000,      # (published) total displacement
+    Loa=9.90,       # (published) length overall
+    Boa=1.98,       # (published) beam overall
+    Ff=0.75,        # (estimated) freeboard fore
+    Fa=0.55,        # (estimated) freeboard aft
+    App=[
+        ShortKeel(Length=1.2, Depth=0.90, Tc_ratio=0.15),  # hull-integrated keel
+        Rudder(Cu=0.32, Cl=0.18, Span=0.75),   # (estimated) separated rudder
+    ],
+    Sails=[
+        Main("MN1", P=10.80, E=3.30, Roach=0.1, BAD=0.80),  # (est.) ~19.6 m²
+        Jib("J1", I=8.50, J=2.70, LPG=2.70, HBI=0.50),      # (est.) ~11.5 m²
+        Kite("S1", area=50.0, vce=4.50),                       # (est.) symmetric kite
+    ],
+    GZ=DARING_GZ,
+    crew_weight=240.0,  # 3 crew × 80 kg
+)
+
+vpp = VPP(Yacht=Daring)
+
+vpp.set_analysis(
+    tws_range=np.arange(4.0, 22.0, 2.0),
+    twa_range=np.linspace(30.0, 180.0, 31),
+)
+
+vpp.run(verbose=False)
+vpp.write("results_daring")
+vpp.polar(3, True)
+vpp.SailChart(True)