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Mainship 34 Sedan Trawler

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Boat REF#

Sold / Unavailable




Underwater profile

Sleeping berths

1 x diesel 210hp, Cummins 6BT (2012)

Seattle, WA USA - Shown by Appointment


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Extra Details

Designer John Cherubini
Builder Mainship Corporation
Lying Seattle, WA USA - Shown by Appointment
Fuel capacity 220.0 USG Total - 2 Tanks
Water capacity 70.0 USG Total - 2 Tanks
Holding tank capacity 35.0 USG Total - 1 Tanks


Engine 1 x diesel 210hp
Engine make and model Cummins 6BT (2012)
Engine Hours Engine1: 581
Engine Cooled Indirect
Steering Wheel
Drive Shaft
Prop(s) 3 blade - plus spare propeller
Fuel consumption (approx) 2.0 USG /hour At Cruising Speed
Cruising speed (approx) 7 knots
Max speed (approx) 12 knots
Generator output 5KVA

A reliable 2012 Cummins 5.9L 6BT 210 HP engine is installed with only 537 hours - a horsepower upgrade from the stock 160 HP engine. Excellent fuel economy comes with a 7 knot cruising speed at only 2 GPH, and higher speeds are easily achieved with this engine.

The ship's energy capacity is impressive. Northstar AGM batteries provide for 1,200 amp hours in the house bank which consists of six batteries. A 1,000 watt inverter-charger provides for power underway or at anchor and is connected to the house batteries. It has two 15 amp grounded outlets. For engine starting two more Northstar AGM batteries are used. These are charged by engine alternator or shore power. And, two more Northstar AGM batteries are installed in the lazarette to power a raw water wash down pump or other devices as desired.

A high capacity Victron 2500 watt Inverter/Charger is in the boat with the necessary wire but is not yet connected.

A Kohler generator of reportedly 5 KW capacity is housed in the lazarette but has not been operated by the owner.

Racor 900FH Water Separator Primary Fuel Filter;


Length 34'0"
LWL 32'5"
Beam 11'11"
Draft Max 2'10"
Airdraft 16'0"
Displacement 14,000.0lbs
Headroom 6'3"
Storage On marina

Electrical Systems

12 volt, 10 batteries charged by: engine, shore power, generator Northstar Energy1 AGM Batteries; Xantrex Link 20 Battery Monitor; Victron Energy Phoenix 2500 Watt Inverter/Charger; ProMariner 40 Battery Charger; Kohler generator


Construction GRP
Underwater profile Semi-Displacement
Finish Gelcoat finish

The 34 Sedan Trawler hull is a solid fiberglass, semi-displacement hull design with a fine bow entry and a full-length keel below. The prop and rudder are protected by the keel which is a nice feature for Northwest waters.

Overall length is 37 feet.
Air draft height is based on the manufacturer specifications (not including the canvas enclosure).

Waterline Boats / Boatshed did not independently verify capacities and measures, which are reported from seller-provided information and/or literature.


Total # of berths 2
No. of double berths 1
Cabin(s) 1
Sink 1
Shower 1
Heads 1 heads (Manual)
Stove tick
Oven tick
Sink tick
Fridge tick
Freezer tick
Cabin heating tick
Pressurised water system tick
Hot water system tick

The layout includes a large open salon with windows and blinds, galley down design, a marine head with shower stall, and a double berth in the forward cabin. The interior flooring, wall covering, and some paneling is in need of finishing. The forward cabin needs headliner replacement and trim out of cabinetry and the double berth.

An Espar hydronic diesel heater is included but not yet installed. It consists of an Espar hydronic furnace, electronic control panel, four heat exchangers and misc. parts for the piping run.

The domestic hot water system is also included but needs to be installed. It is a Seaward 6 gallon with both 110 volt electric and water heat exchanger that can be piped into the engine cooling system and/or the hydronic furnace.

Gourmet propane stove with oven;
Nova-Kool under counter refrigerator;

3 burner propane Stove

Nav Equipment

Compass tick
VHF DSC radio tick
GPS tick
Chart plotter tick
Navigation lights tick

ICOM IC-M504 VHF DSC Radio with remote unit;
Garmin GPSMAP 4212 Multi-function Chartplotter;
Garmin GPSMAP 3010C Multi-function Chartplotter;
Azimuth Digital Compass;
Ritchie Compass;
Kenwood KDC-MP438U Stereo with MP3;
ICOM AIS Receiver (installed, not connected);

Deck Gear

Sprayhood tick
Cockpit cover tick
Bimini tick
Rode tick
Fenders tick
Swim Platform tick
Cockpit Enclosure tick

Electric Lewmar windlass
1 anchors
(Bruce 22 KG pimary, Danforth secondary)
175'0" of chain
175'0" of rode
Anchor chain is 5/16" link; anchor rode is 5/8" line.

Safety Equipment

Fume detector tick

Broker's Comments

This is hull #1 of one of the most popular small cruisers ever built: the Mainship 34 Sedan Trawler model. The boat has strong mechanical, electrical, and navigation systems and currently is in need of interior finishing and exterior finishing and repairs.

A Cummins 210 HP diesel was installed in 2012 and has only 537 hours of use. This is an upgrade in horsepower from the stock engine and is known to be one of the most reliable diesel engines. A massive 1200 amp-hour Northstar AGM house battery bank is installed with a 1000 watt inverter for power underway, and a 2500 Victron Inverter-Charger ready for connection . A current Garmin 4212 multi-function chartplotter system with radar is installed as well as a Garmin 3010C chartplotter at the lower helm. The ICOM VHF-DSC radio includes a remote command unit at the lower helm and there's an ICOM AIS Receiver ready for connection. There's a four-zone Espar hydronic diesel furnace included as well that is ready for installation.

Restoration has begun on the boat interior, and the remaining work involves basic carpentry and installation of the owner's choice of trim features. Outside, the non-skid paint on the deck appears cracked and rough in places and the gel coat is worn in certain areas suggesting exterior painting is in order. The flybridge boat deck core appears soft in places when walked upon but provides easy access for core repairs.

This boat represents a solid foundation for further improvement by the next owner who has the interest of completing the project and is value priced now with this in mind.

These boat details are subject to contract.
Note: Offers on the asking price may be considered.

This Mainship 34 Sedan Trawler has been personally photographed and viewed by Brian Moratti of Boatshed Seattle. Click here for contact details.
The particulars herein are intended to give a fair description of the vessel but are not guaranteed as accurate. They shall not form part of any offer or contract for the sale of the vessel. The prospective purchaser is recommended to independently check the particulars. The vendor is not selling in the course of a business unless otherwise stated. Personal property is excluded from the sale of the vessel unless specifically included in the listing specifications above or in a Purchase Contract. Personal property may be equipment or gear not permanently attached to the vessel including but not limited to: artwork, entertainment equipment, fishing equipment, TV receivers, recreational equipment, kayaks, tools, and personal appliances. Photos that may incidentally depict owners' personal property do not convey that such items are included in the sale of the vessel unless specifically listed herein.

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