B-Atlas Boat Guide · MNSH-400-TR
Mainship 400 Trawler
2003–2012
The Mainship 400 Trawler is a broad-beam flybridge cruiser with two cabins, molded bridge stairs and primarily single-diesel shaft propulsion. Its semi-displacement hull, large bridge and substantial tankage support extended inland and coastal cruising. Later examples were also marketed as the 414 Trawler.
- LOA
- 41′ 4″ / 12.6 m
- LWL
- 38′ 4″ / 11.68 m
- Beam
- 14′ 2″ / 4.32 m
- Draft
- 3′ 8″ / 1.12 m
- Hull behaviour
- Semi-Displacement
- Fuel
- Diesel
- Propulsion
- Shaft
- Engine configuration
- Primarily single inboard diesel; engine options vary
- Displacement cruise
- Unknown
- Faster / planing cruise
- Unknown
- Boat family
- Trawler
- Construction
- Fiberglass hull with cored deck and superstructure areas
Best for
- Couples planning extended inland and coastal cruising
- Owners wanting a large flybridge without ladder access
- Buyers comfortable with 40-foot marina and maintenance costs
Trade-offs
- High air draft and wide beam limit route and marina choices
- Single-engine examples rely on one propulsion system
- Large superstructure and deck areas require moisture surveillance
- Operating and haul-out costs are materially higher than smaller Mainships
Known concerns
- No model-specific concern has been promoted to B-Atlas’s evidence threshold. This does not mean the model has no age-, condition- or hull-specific risks.
Inspection focus
- Verify engine specification, thrusters and actual loaded performance
- Inspect deck, flybridge, window and superstructure cores for moisture
- Inspect fuel tanks, exhaust, electrical distribution and generator installation
- Confirm air draft, mast-lowering procedure and haul-out requirements
Continue researching
Related boat models
Mainship 350 Trawler
39.75 ft · Semi-Displacement
Mainship 390 Trawler
39.75 ft · Semi-Displacement
Mainship 34 Trawler
38.83 ft · Semi-Displacement
Mainship 34 Diesel Cruiser
34 ft · Semi-Displacement
Mainship 34 II
34 ft · Semi-Displacement
Mainship 34 III
34 ft · Semi-Displacement
About this record
B-Atlas preserves uncertainty: missing information remains unknown rather than being treated as a negative. Specifications and guidance describe the model record; individual boats can differ by year, equipment, refit and condition.