The Optima 83 Dehler is well-powered with enough sail area to move in light air, with acceptable motion comfort for coastal passages.
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 22.0′, the Optima 83 Dehler tops out around 6.3 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √22.0′ LWL = 6.3 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
21.6
Powerful cruiser/racer — quick in light air, reef early when it pipes up.
Comfort Ratio
21.3
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Capsize Screening
1.87
Below the 2.0 offshore threshold — acceptable for ocean passages.
Pounds/Inch Immersion
639lbs
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
21.3
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Under 20 — Snappy, racing motion
20–30 — Acceptable coastal
30–40 — Good offshore comfort
Over 40 — Very comfortable offshore
Capsize Screening Formula
1.87
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 Optima 83 Dehler sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Cruiser/Racer 90–150
Cruiser 150–210
Heavy Cruiser 210–300
Dufour 27
186s/nm
Santana 27
201s/nm
Hunter 27
213s/nm
Irwin 27
225s/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° |
2.8 |
3.6 |
4.0 |
4.2 |
| Close Reach60° |
3.4 |
4.3 |
4.8 |
5.0 |
| Beam Reach90° |
4.2 |
5.3 |
5.9 |
6.2 |
| Broad Reach120–135° |
3.9 |
4.9 |
5.5 |
5.7 |
| Run150–180° |
3.1 |
3.9 |
4.4 |
4.6 |
These are simplified estimates based on hull speed (6.3 kts),
SA/D (21.6), 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 Optima 83 Dehler — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–6 kts
6–18 kts
18–26 kts
26+ kts
Ghosting
0–6 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
6–18 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
18–26 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
26+ 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 Optima 83 Dehler.
|
Optima 83 Dehler |
Dufour 27 |
Granada 27 |
Hunter 27 |
Irwin 27 |
Santana 27 |
| Dimensions |
| LOA |
27.1 |
27.2 |
27.2 |
27.2 |
27.1 |
27.0 |
| LWL |
22.0 |
20.3 |
21.0 |
22.0 |
20.5 |
22.5 |
| Beam |
8.1 |
9.2 |
9.1 |
9.2 |
8.7 |
9.0 |
| Displacement |
5 |
5 |
5 |
7 |
6 |
5 |
| Ballast |
1 |
1 |
2 |
3 |
— |
2 |
| Sail Area |
408 |
308 |
325 |
303 |
356 |
348 |
| Performance |
| PHRF |
— |
186 |
— |
213 |
225 |
201 |
| SA/Disp |
21.6 |
15.2 |
15.8 |
13.2 |
16.2 |
19.1 |
| Bal/Disp |
— |
34.0 |
44.1 |
42.9 |
— |
46.0 |
| Comfort |
21.3 |
21.1 |
21.4 |
— |
25.6 |
17.4 |
| Capsize |
1.87 |
2.04 |
2.01 |
— |
1.85 |
2.11 |
| Hull Speed |
6.3 |
6.0 |
6.1 |
— |
6.1 |
6.4 |