Pearson 31-2   Speed Polar Reference

Masthead Sloop  ·  1987–1991  ·  Designer: William Shaw / W.G. Richards  ·  PHRF 156–165
Vessel Specifications
LOA30.67 ft (9.35 m)
LWL25.42 ft (7.75 m)
Beam10.67 ft (3.25 m)
Draft (std / shoal)5.80 ft / 4.0 ft
Displacement10,000 lb (4,536 kg)
Ballast / Ratio3,800 lb  ·  38%
Sail Area (total)492.8 ft²
Mainsail (P × E)36.8 × 12.0 ft  ·  220.8 ft²
Foretriangle (I × J)42.5 × 12.8 ft  ·  272.0 ft²
SA/D ratio17.05
Disp/Length ratio271.8
Comfort ratio24.45
Capsize screen (CSF)1.98
Hull Speed6.76 kn
PHRF (avg)156 – 165 s/nm
VMG Optimum Angles & Target Speeds
TWS Beat ° BSP↑ VMG↑ Run ° BSP↓ VMG↓
Beat/Run ° = True wind angle from dead upwind/downwind at best VMG.
BSP = Boat speed (kn) at that angle.  VMG = Velocity made good (kn).
Boat Speed (knots) by True Wind Angle & True Wind Speed
TWA →
TWS ↓		 52°
Close-hauled		 60° 75° 90°
Beam		 110° 120° 135° 150°
Broad reach
Speed Polar Diagram — All Wind Speeds
Data source & methodology: No official VPP data exists for the Pearson 31-2. These polars were computed by scaling the Pearson 33 reference polar (Seapilot polar database) using hull speed ratio (√LWL₃₁₋₂/√LWL₃₃ = 0.970), SA/D, and displacement ratios with angle-dependent weighting.   Indicative performance only — actual speeds vary with sail trim, sea state, crew weight, canvas selection, and bottom condition. Upwind angles assume working jib; downwind angles assume poled-out headsail or reacher.  ·  Spec data: sailboatdata.com/sailboat/pearson-31-2  ·  Created with Perplexity Computer — perplexity.ai/computer