The Robb 35 is moderately powered for comfortable coastal cruising, with a steady, comfortable ride offshore.
Hull Speed
The theoretical displacement-mode speed limit — determined by waterline length, not engine or sail power.
A displacement hull pushes a bow wave whose speed is limited by the waterline length.
With a waterline of 24.0′, the Robb 35 tops out around 6.6 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √24.0′ LWL = 6.6 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
15.6
Moderate sail power — a capable coastal cruiser, not overpowered.
Ballast / Displacement
31.6%
Typical cruising ballast — balanced stability and motion underway.
Displacement / Length
481
Heavy displacement — a slow, steady, seakindly hull.
Comfort Ratio
39.0
Good offshore comfort — steady enough for multi-day passages.
Capsize Screening
1.63
Below the 2.0 offshore threshold — acceptable for ocean passages.
Pounds/Inch Immersion
858lbs
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
39.0
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
1.63
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 Robb 35 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Racer 0–90
Cruiser/Racer 90–150
Cruiser 150–210
Contessa 35
114s/nm
Cal 36
150s/nm
Cascade 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° |
2.5 |
3.2 |
3.5 |
3.7 |
| Close Reach60° |
3.0 |
3.8 |
4.3 |
4.5 |
| Beam Reach90° |
3.7 |
4.7 |
5.3 |
5.5 |
| Broad Reach120–135° |
3.4 |
4.3 |
4.9 |
5.1 |
| Run150–180° |
2.7 |
3.5 |
3.9 |
4.0 |
These are simplified estimates based on hull speed (6.6 kts),
SA/D (15.6), 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 Robb 35 — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–7 kts
7–20 kts
20–28 kts
28+ kts
Ghosting
0–7 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
7–20 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
20–28 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
28+ 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 Robb 35.
|
Robb 35 |
Cal 36 |
Cal Cruising 36 |
Cascade 36 |
Contessa 35 |
Lion Class Robb |
| Dimensions |
| LOA |
35.5 |
35.5 |
35.5 |
35.6 |
35.5 |
35.5 |
| LWL |
24.0 |
27.0 |
27.0 |
28.9 |
29.5 |
25.0 |
| Beam |
10.0 |
10.3 |
10.3 |
10.0 |
11.4 |
8.8 |
| Displacement |
14 |
11 |
12 |
12 |
13 |
14 |
| Ballast |
4 |
4 |
— |
4 |
6 |
4 |
| Sail Area |
587 |
600 |
600 |
590 |
623 |
513 |
| Performance |
| PHRF |
— |
150 |
— |
150 |
114 |
— |
| SA/Disp |
15.6 |
19.2 |
18.4 |
17.6 |
17.6 |
14.1 |
| Bal/Disp |
31.6 |
40.2 |
— |
35.5 |
— |
28.2 |
| Comfort |
39.0 |
26.1 |
28.0 |
29.1 |
26.0 |
43.4 |
| Capsize |
1.63 |
1.85 |
1.81 |
1.73 |
1.92 |
1.45 |
| Hull Speed |
6.6 |
7.0 |
7.0 |
7.2 |
7.3 |
6.7 |