Seidelmann 25
Description
The Seidelmann 25 is an American trailerable racer-cruiser sailboat designed by Bob Seidelmann, a renowned sailmaker and champion one-design sailor, and built by Seidelmann Yachts in Berlin, New Jersey, from 1977 to 1984. Approximately 200–300 units were produced during its short run, as the company focused on IOR (International Offshore Rule) race-boat designs that emphasized beam for stability and interior space but often at the expense of tenderness in light winds. Intended for club racing, daysailing, and short coastal cruises, it appeals to budget-conscious sailors seeking a spacious, responsive boat under 25 feet. Owners describe it as "fun like a sports car" with good upwind performance, though it's polarizing due to its initial tenderness and mixed build quality reputation—some call it "solid and reliable," while others note it's "not for beginners" and prone to early heeling. Production ended amid the company's expansion and declining quality perceptions, but as of September 2025, used examples remain affordable classics in the used market, with a small but dedicated owner community via forums like SailNet and SailboatOwners.com.
Construction Details
| Designer | J. Robert Seidelmann |
|---|---|
| Builder | Seidelmann Yachts |
| Length | 25.000 ft |
| LOA | 24.600 ft |
| LWL | 20.000 ft |
| Beam | 9.500 ft |
| Displacement | 4600 lb |
| Max Draft | 4.330 ft |
The standard boat dimensions
| i | 31 ft |
|---|---|
| j | 10.92 ft |
| p | 25 ft |
| e | 9 ft |
| p2 | - |
| e2 | - |
| i2 | - |
| j2 | - |
| I | J | P | E | P2 | E2 | I2 | J2 |
|---|---|---|---|---|---|---|---|
| 31 ft | 10.92 ft | 25 ft | 9 ft | - | - | - | - |
Blueprints
Sails
| Sail Type | MAINSAIL |
|---|---|
| Luff | * 25 ft - (7620 mm) |
| Foot | * 9 ft - (2743 mm) |
| Leech | * 26.09 ft - (7952 mm) |
| Tack Angle | * 88 ° |
| Diagonal | * 26.27 ft - (8007 mm) |
| Head (inches) | * 4 in - (102 mm) |
| Area | * 116.1 ft² |
| Sail Type | JIBSAIL |
|---|---|
| Luff | * 26.29 ft - (8013 mm) |
| Foot | * 14.71 ft - (4484 mm) |
| Leech | * 22.45 ft - (6843 mm) |
| Percentage LP | * 114.93 % |
| Length Perpendicular | * 12.55 ft - (3825 mm) |
| Deck Angle | * 12.04 ° |
| Area | * 164.96 ft² |
| Sail Type | GENOA |
|---|---|
| Luff | 30 ft - (9144 mm) |
| Foot | 16 ft - (4877 mm) |
| Leech | 28 ft - (8534 mm) |
| Percentage LP | * 135.07 % |
| Length Perpendicular | * 14.75 ft - (4496 mm) |
| Deck Angle | * 3.39 ° |
| Area | * 221.25 ft² |
| Sail Type | GENOA |
|---|---|
| Luff | * 31.22 ft - (9516 mm) |
| Foot | * 17.85 ft - (5441 mm) |
| Leech | * 29.16 ft - (8888 mm) |
| Percentage LP | * 150 % |
| Length Perpendicular | * 16.38 ft - (4993 mm) |
| Deck Angle | * 4.02 ° |
| Area | * 255.68 ft² |
| Sail Type | ASYMMETRICAL |
|---|---|
| Luff | * 31.22 ft - (9516 mm) |
| Foot | * 18.02 ft - (5492 mm) |
| Leech | * 28.72 ft - (8754 mm) |
| Perc LP | * 165 % |
| Area | * 422 ft² |
Disclaimer. Boats are not all the same -- even when produced in the same factory of the same model. Sailrite does its best to publish accurate dimensions, but we often find it worthwhile to have our customers measure their boats carefully before we produce kits for them. You should take the same precautions, especially when the data is not from Sailrite. The information on this site is not guaranteed to be accurate. Sailrite offers this content as a service to our community, but takes no responsibility for the reliability of the data provided.