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Performance & Speed

Medway 36 Westerly Performance

How the Medway 36 Westerly performs on the water — racing handicap, speed, sail-carrying power, stability and comfort.

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The Medway 36 Westerly is modestly canvassed and unhurried, with a steady, comfortable ride offshore.

Hull Speed

The theoretical displacement-mode speed limit — determined by waterline length, not engine or sail power.

7.4 kts
A displacement hull pushes a bow wave whose speed is limited by the waterline length. With a waterline of 30.4′, the Medway 36 Westerly tops out around 7.4 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √30.4′ LWL = 7.4 kts

Performance Ratios

Racing handicap, sail-carrying power, stability and comfort — and what each one actually tells you about a day on the water.

SA / Displacement
12.6
Modestly canvassed — a comfortable, unhurried cruiser.
Comfort Ratio
31.3
Good offshore comfort — steady enough for multi-day passages.
Capsize Screening
1.77
Below the 2.0 offshore threshold — acceptable for ocean passages.
Hull Speed
7.4kts
Pounds/Inch Immersion
1lbs
Weight needed to sink the hull one inch — loading sensitivity.

Motion & Offshore Suitability

Two ratios that matter most when you're planning passages — how the boat feels in a seaway, and whether the hull geometry is suitable for open ocean.

Comfort Ratio
31.3
Good offshore comfort — steady enough for multi-day passages.
Under 20 — Snappy, racing motion
20–30 — Acceptable coastal
30–40 — Good offshore comfort
Over 40 — Very comfortable offshore
Capsize Screening Formula
1.77
Below the 2.0 offshore threshold — acceptable for ocean passages.
Under 2.0 — Acceptable for offshore
Over 2.0 — Coastal / protected waters

PHRF Fleet Position

Where the Medway 36 Westerly sits on the PHRF handicap spectrum — lower numbers mean faster boats.

Racer 0–90
Cruiser/Racer 90–150
Cruiser 150–210
High Tension 36 120s/nm
Rival 36 150s/nm

Estimated Speed by Wind

Rough boat speed estimates at different true wind speeds and points of sail — derived from hull speed, SA/D, and displacement, not measured polars.

Point of Sail 6 kts TWS 10 kts TWS 15 kts TWS 20 kts TWS
Close-hauled40–50° 2.6 3.3 3.6 3.8
Close Reach60° 3.1 3.9 4.4 4.6
Beam Reach90° 3.8 4.8 5.4 5.6
Broad Reach120–135° 3.5 4.5 5.0 5.2
Run150–180° 2.8 3.6 4.0 4.2
These are simplified estimates based on hull speed (7.4 kts), SA/D (12.6), and empirical efficiency curves — not instrument-measured polars. Real-world speed varies with sea state, bottom condition, sail trim, and current. Speeds in gold approach hull speed; bold gold means near or at hull speed.

Wind Range & Comfort Envelope

Estimated wind ranges for comfortable sailing on the Medway 36 Westerly — based on sail area, ballast, and displacement characteristics.

Ghost
Sweet Spot
Reef
Heavy
0–8 kts 8–22 kts 22–30 kts 30+ kts
Ghosting
0–8 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
8–22 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
22–30 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
30+ kts
Storm conditions. Storm jib or bare poles. Seek shelter if coastal.

How It Compares

Side-by-side with the boats most often cross-shopped against the Medway 36 Westerly.

Medway 36 Westerly Galway 36 Westerly High Tension 36 Morgan Out Island 36 Rival 36 Solway 36 Westerly
Dimensions
LOA 35.8 35.8 35.8 35.8 35.8 35.8
LWL 30.4 30.3 31.5 28.0 27.2 30.3
Beam 11.2 11.2 11.5 11.4 11.0 11.2
Displacement 16 17 19 16 14 17
Ballast 7 8 — 7 5 8
Sail Area 502 616 601 579 573 500
Performance
PHRF — — 120 — 150 —
SA/Disp 12.6 14.8 13.4 14.6 15.7 12.0
Bal/Disp — 47.8 — 46.9 39.2 —
Comfort 31.3 33.9 35.5 31.8 30.4 33.8
Capsize 1.77 1.73 1.71 1.82 1.82 1.73
Hull Speed 7.4 7.4 7.5 7.1 7.0 7.4