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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
Thames Marine Invader 20

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Boat REF# 74263
This boat has been sold
Length 6.10m (20'0")
Year 1979
Construction GRP
Underwater profile Bilge
Sleeping berths 4
Engine 1 x gasoline 5hp, Honda (unknown year)
Lying Norfolk Broads


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Extra Details

Designer David Felton
Builder Garnham, Brundall
Lying Norfolk Broads
Discounts available from our Preferred Partners
Fuel capacity 10.0 ltr (2.2 USG) Total - 1 Tanks
Water capacity 20.0 ltr (4.4 USG) Total - 1 Tanks


Engine 1 x gasoline 5hp
Engine make and model Honda (unknown year)
Engine Hours Not Recorded
Engine Cooled Direct
Steering tiller
Drive outboard
Prop(s) 3 blade aluminium
Fuel consumption (approx) Not Recorded
Cruising speed (approx) 4 knots
Max speed (approx) 5 knots
Engine spares tick

The motor sits on a transom bracket with remote fuel tank in the cockpit. It had a dealer service and new impeller fitted in 2007 and has done few hours since.


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Length 6.10m (20'0")
LWL 5.50m (18'1")
Beam 2.10m (6'11")
Draft Min 0.75m (2'6")
Draft Max 0.75m (2'6")
Displacement 998kg (2,200.0lbs)
Headroom 1.40m (4'7")
Storage On marina


10% discount on rigging

Sloop rigged Proctor Aluminium spars (1979) with Stainless Steel standing rigging (unknown year)


New Sails Upgrade?
Reefing mainsail - (unknown year)
Headsail - Hank On (unknown year)
Other sails Genoa (unknown year)

Electrical Systems

12 volt, 1 batteries charged by: mains charged at home


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Construction GRP
Underwater profile Bilge
Finish Paint finish

The Invader 20 started life as the Snapdragon 600 and was built by several different builders. This example was moulded and completed by Brundall based boatbuilder Garnhams.


Total # of berths 4
No. of double berths 1
No. of single berths 2
Cabin(s) 1
Heads 1 heads (Porta Potti)
Sink tick
Carpet tick
Drapes tick
Pressurised water system tick
Non-Smokers tick

An open plan saloon provides a bright living space with double berth up forward and single quarter berths. Galley to port needs a cooker to complete, sink to stbd has portable water tank below.

Nav Equipment

Compass tick
VHF tick
Stereo tick
Clock tick
Barometer tick
Navigation lights tick
Depth sounder tick

Deck Gear

Sail cover tick
Rode tick
Fenders tick
Boathook tick
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Swim Ladder tick

2 sheet winches
4 anchors
(Danforth, 2 x Rond, mudweight)
10.00m (32'10") of chain
10.00m (32'10") of rode
This boat has a four-wheel road trailer, stored safely at the vendor's home, hence no photo!

Safety Equipment

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Life jackets tick
Horn tick
Swim ladder tick

1 bilge pumps (1 manual / 0 electric)

There is a powder fire extinguisher on board next to the galley and the boat has a current Broads Boat Safety Scheme Certificate to 2013

Broker's Comments

A well-built little vessel with a surprisingly modern layout. She has a spacious cockpit, with simple controls and reliable Honda motor. The current owners have cruised the Norfolk Broads extensively, but a previous owner made coastal passages in her comfortably. The Invader 20 is simple to sail with a good performance. The wide hatchway and extra perspex washboards let in a lot of light. Berths are available for up to four extremely good friends.
These boat details are subject to contract.
Note: Offers on the asking price may be considered.

This Thames Marine Invader 20 has been personally photographed and viewed by Bob of Boatshed Norfolk. 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.