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The boat featured is not currently for sale by Boatshed. The boat information and images presented are part of Boatshed’s back catalogue of the 20,000+ boats we have listed in the last 15 years and appear here for general information and guidance purposes about Boatshed and our boat selling systems and services
Thornycroft Sealion 40

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Boat REF# 112634
This boat has been sold
Length 12.14m (39'10")
Year 1968
Construction GRP
Underwater profile Semi-Displacement
Sleeping berths 4
Engine 2 x diesel 145hp, Perkins HT6.354 (1968)


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Extra Details

Designer Thornycroft
Builder J G Meakes Ltd
Discounts available from our Preferred Partners
Fuel capacity 1,363.0 ltr (299.9 USG) Total - 1 Tanks
Water capacity 454.0 ltr (99.9 USG) Total - 1 Tanks


Engine 2 x diesel 145hp
Engine make and model Perkins HT6.354 (1968)
Engine Hours engine1:   566    engine2:   566
Engine Cooled Indirect
Steering wheel
Drive shaft
Prop(s) single pitched
Fuel consumption (approx) Not Recorded
Cruising speed (approx) 12 knots
Max speed (approx) 17 knots

The recorded engine hours of 566h is probably incorrect but no other records are available.
As well as the 24v system there are 3 12v batteries dedicated to the 240v inverter.


Length 12.14m (39'10")
LWL 11.50m (37'9")
Beam 3.81m (12'6")
Draft Min 1.07m (3'6")
Draft Max 1.07m (3'6")
Airdraft 2.90m (9'6")
Displacement 16,250kg (35,831.3lbs)
Headroom 1.85m (6'1")
Storage On marina

Electrical Systems

24 volt, 4 batteries charged by: engine, shore power


10% discount on ultrasonic antifouling
Construction GRP
Underwater profile Semi-Displacement
Finish Paint finish

Holding tank can easily be added


Total # of berths 4
No. of double berths 1
No. of single berths 2
Cabin(s) 2
Sink 2
Shower 2
Heads 2 heads (Electric)
Stove tick
Broiler tick
Oven tick
Sink tick
Fridge tick
Freezer tick
Carpet tick
Drapes tick
Cabin heating tick
Pressurised water system tick
Hot water system tick
Fresh water wash tick
Cockpit shower tick
Microwave tick
Washing Machine tick

She has a full central heating system throughout.
Saloon has been converted to comfortable live aboard seating but can easily be changed back to original fit.

2 burner propane Stove

Nav Equipment

Compass tick
Speed tick
Log tick
VHF tick
GPS tick
Chart plotter tick
Stereo tick
Clock tick
Barometer tick
Navigation lights tick
Depth sounder tick

Deck Gear

Sprayhood tick
Cockpit cover tick
Bimini tick
Rode tick
Fenders tick
Boathook tick
Davits tick
Swim Platform tick
Swim Ladder tick
Passerelle tick

Electric Simpson Lawrence windlass
2 anchors
50.00m (164'1") of chain
Avon dinghy (unknown year)
The non slip decking is due to be renewed by the current owner.

Safety Equipment

Fume detector tick
Life jackets tick
Searchlight tick
Horn tick

2 bilge pumps (0 manual / 2 electric)

As well as the 2 electric bilge pumps, there is a mechanical pump system that can be diverted to any sealed bulkhead (see photos)

Broker's Comments

This boat has been meticulously looked after by her current owner. Although she has been converted to a long term live-aboard, her interior can easily be returned to her original design. She has a large cockpit and huge foredeck for those sunny days but also benefits from central heating throughout the boat. She has been personally re-fitted internally by the current owner to a very high standard. These boat details are subject to contract.
Note: Offers on the asking price may be considered.

This Thornycroft Sealion 40 has been personally photographed and viewed by Paul & Steve of Boatshed Costa Brava. Click here for contact details.
Disclaimer The particulars detailed herein are intended to give a fair description of the vessel but their accuracy cannot be guaranteed. These particulars are not and shall not form part of any offer or contract for the sale of the vessel and are supplied on the understanding that all negotiations shall be through Boatshed, who act as agents for the vendor. The vendor is not selling in the course of a business unless otherwise stated. The prospective purchaser is strongly recommended to check the particulars and, where considered appropriate, at his own expense, to employ qualified agents to carry out structural and/or mechanical and/or electrical surveys and inspections in order to assess the actual condition of the vessel before purchase.