The Tartan 4700 is moderately powered for comfortable coastal cruising, with a steady, comfortable ride offshore, and competitive on the racecourse.
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 39.5′, the Tartan 4700 tops out around 8.4 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √39.5′ LWL = 8.4 kts
Performance Ratios
Racing handicap, sail-carrying power, stability and comfort — and what each one actually tells you about a day on the water.
PHRF Rating
84s/nm
Performance racer — quick around the cans and offshore.
SA / Displacement
17.8
Moderate sail power — a capable coastal cruiser, not overpowered.
Ballast / Displacement
34.8%
Typical cruising ballast — balanced stability and motion underway.
Displacement / Length
203
Moderate — a good balance of speed and load-carrying ability.
Comfort Ratio
30.6
Good offshore comfort — steady enough for multi-day passages.
Capsize Screening
1.86
Below the 2.0 offshore threshold — acceptable for ocean passages.
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
30.6
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
1.86
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 Tartan 4700 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Racer 0–90
Cruiser/Racer 90–150
Cruiser 150–210
Tartan 4700
84s/nm
Performance racer — quick around the cans and offshore.
Hylas 47
93s/nm
Catalina 470
102s/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° |
3.4 |
4.3 |
4.8 |
5.1 |
| Close Reach60° |
4.2 |
5.2 |
5.9 |
6.1 |
| Beam Reach90° |
5.1 |
6.4 |
7.2 |
7.5 |
| Broad Reach120–135° |
4.7 |
5.9 |
6.6 |
6.9 |
| Run150–180° |
3.8 |
4.8 |
5.3 |
5.5 |
These are simplified estimates based on hull speed (8.4 kts),
SA/D (17.8), 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 Tartan 4700 — 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 Tartan 4700.
|
Tartan 4700 |
Catalina 470 |
First 477 Beneteau |
Hylas 47 |
Sun Odyssey 47 Jeanneau |
Swan 46 Mkii |
| Dimensions |
| LOA |
46.9 |
47.0 |
47.0 |
46.8 |
47.0 |
47.1 |
| LWL |
39.5 |
41.0 |
41.3 |
37.8 |
40.7 |
37.8 |
| Beam |
14.1 |
14.2 |
14.8 |
14.3 |
14.4 |
14.4 |
| Displacement |
28 |
27 |
25 |
35 |
28 |
31 |
| Ballast |
9 |
10 |
8 |
14 |
10 |
11 |
| Sail Area |
1 |
1,010 |
1,033 |
1 |
1,152 |
978 |
| Performance |
| PHRF |
84 |
102 |
— |
93 |
— |
— |
| SA/Disp |
17.8 |
17.9 |
19.2 |
15.8 |
19.6 |
15.8 |
| Bal/Disp |
34.8 |
40.0 |
33.3 |
41.7 |
35.4 |
— |
| Comfort |
30.6 |
28.7 |
25.3 |
38.9 |
— |
34.1 |
| Capsize |
1.86 |
1.86 |
2.01 |
1.75 |
— |
1.83 |
| Hull Speed |
8.4 |
8.7 |
8.6 |
8.2 |
— |
8.2 |