The 1D 48 is aggressively canvassed for its weight, with a quick, snappy motion best suited to day sailing.
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 40.9′, the 1D 48 tops out around 8.6 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √40.9′ LWL = 8.6 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
27.9
Performance-oriented — carries a lot of canvas for its weight.
Ballast / Displacement
49.1%
Race-oriented ballast ratio — very stiff and powerful.
Displacement / Length
117
Ultralight — responsive and fast, but carries less stores.
Comfort Ratio
18.8
Quick, snappy motion — better for day sails and racing than long passages.
Capsize Screening
2.17
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
Pounds/Inch Immersion
2lbs
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
18.8
Quick, snappy motion — better for day sails and racing than long passages.
Under 20 — Snappy, racing motion
20–30 — Acceptable coastal
30–40 — Good offshore comfort
Over 40 — Very comfortable offshore
Capsize Screening Formula
2.17
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
Under 2.0 — Acceptable for offshore
Over 2.0 — Coastal / protected waters
PHRF Fleet Position
Where the 1D 48 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Racer 0–90
Cruiser/Racer 90–150
X 482
15s/nm
Baltic 47
24s/nm
Baltic 48 Dp
48s/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° |
4.0 |
5.1 |
5.7 |
5.9 |
| Close Reach60° |
4.9 |
6.2 |
6.9 |
7.2 |
| Beam Reach90° |
6.0 |
7.6 |
8.5 |
9.2 |
| Broad Reach120–135° |
5.5 |
7.0 |
7.8 |
8.5 |
| Run150–180° |
4.4 |
5.6 |
6.3 |
6.5 |
These are simplified estimates based on hull speed (8.6 kts),
SA/D (27.9), 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 1D 48 — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–5 kts
5–18 kts
18–28 kts
28+ kts
Ghosting
0–5 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
5–18 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
18–28 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 1D 48.
|
1D 48 |
Baltic 47 |
Baltic 48 Dp |
Cr 470 |
J/145 |
X 482 |
| Dimensions |
| LOA |
48.4 |
47.8 |
48.1 |
47.8 |
47.9 |
48.0 |
| LWL |
40.9 |
39.5 |
38.6 |
41.9 |
41.0 |
41.0 |
| Beam |
14.2 |
14.4 |
14.3 |
14.7 |
14.2 |
14.1 |
| Displacement |
17 |
24 |
26 |
29 |
26 |
26 |
| Ballast |
8 |
10 |
11 |
12 |
11 |
11 |
| Sail Area |
1 |
1 |
1 |
1 |
1,020 |
1 |
| Performance |
| PHRF |
— |
24 |
48 |
— |
— |
15 |
| SA/Disp |
27.9 |
22.2 |
20.4 |
22.9 |
16.5 |
20.8 |
| Bal/Disp |
49.1 |
41.1 |
44.6 |
42.3 |
42.3 |
— |
| Comfort |
18.8 |
26.0 |
28.7 |
29.4 |
35.9 |
28.0 |
| Capsize |
2.17 |
1.98 |
1.92 |
1.90 |
1.54 |
1.89 |
| Hull Speed |
8.6 |
8.4 |
8.3 |
8.7 |
11.0 |
8.6 |