The Impala 35 Ss 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 25.6′, the Impala 35 Ss tops out around 6.8 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √25.6′ LWL = 6.8 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
14.3
Moderate sail power — a capable coastal cruiser, not overpowered.
Ballast / Displacement
40.9%
Stiff enough to carry a big genoa comfortably into moderate breeze.
Displacement / Length
372
Heavy displacement — a slow, steady, seakindly hull.
Comfort Ratio
35.2
Good offshore comfort — steady enough for multi-day passages.
Capsize Screening
1.68
Below the 2.0 offshore threshold — acceptable for ocean passages.
Pounds/Inch Immersion
924lbs
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
35.2
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
1.68
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 Impala 35 Ss sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Cruiser/Racer 90–150
Cruiser 150–210
Heavy Cruiser 210–300
J/34
120s/nm
Sabre 34
132s/nm
Ericson 34
159s/nm
Tartan 34 2
174s/nm
Bristol 34
210s/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 |
3.1 |
3.5 |
3.7 |
| Close Reach60° |
3.0 |
3.8 |
4.3 |
4.4 |
| Beam Reach90° |
3.7 |
4.7 |
5.2 |
5.4 |
| Broad Reach120–135° |
3.4 |
4.3 |
4.8 |
5.0 |
| Run150–180° |
2.7 |
3.5 |
3.9 |
4.0 |
These are simplified estimates based on hull speed (6.8 kts),
SA/D (14.3), 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 Impala 35 Ss — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–7 kts
7–22 kts
22–32 kts
32+ kts
Ghosting
0–7 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
7–22 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
22–32 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
32+ 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 Impala 35 Ss.
|
Impala 35 Ss |
Bristol 34 |
Ericson 34 |
J/34 |
Sabre 34 |
Tartan 34 2 |
| Dimensions |
| LOA |
34.3 |
34.3 |
34.1 |
34.1 |
34.2 |
34.4 |
| LWL |
25.6 |
26.0 |
28.9 |
28.5 |
26.3 |
28.8 |
| Beam |
10.1 |
10.5 |
10.8 |
11.4 |
10.5 |
11.0 |
| Displacement |
13 |
11 |
10 |
9 |
11 |
11 |
| Ballast |
5 |
5 |
5 |
3 |
4 |
4 |
| Sail Area |
516 |
481 |
494 |
525 |
506 |
538 |
| Performance |
| PHRF |
— |
210 |
159 |
120 |
132 |
174 |
| SA/Disp |
14.3 |
15.2 |
17.1 |
20.1 |
16.0 |
17.5 |
| Bal/Disp |
40.9 |
48.7 |
50.0 |
41.3 |
— |
40.0 |
| Comfort |
35.2 |
27.2 |
21.5 |
26.2 |
26.9 |
23.0 |
| Capsize |
1.68 |
1.86 |
2.00 |
1.71 |
1.87 |
1.97 |
| Hull Speed |
6.8 |
6.8 |
7.2 |
8.2 |
6.9 |
7.2 |