Cored hulls on boats



The risk of water entry into a cored bottom boat is obvious to most experienced boat owners. All it takes is for one improperly made screw hole to turn a boat bottom into mush. Take a look at the above photo that illustrates the results of what happens when water gets into a core. What you see there is the bottom chamber of the boat hull that was in the process of completely disintegrating. The reason is that once water gets into a core, a phenomenon called hydraulic erosion takes place. Due to the slamming and pounding of the hull bottom on the sea surface, water contained within a core will be compressed by the flexing laminate structure. Thus, the bottom literally becomes a diaphragm pump.

 

Bounty 34 Soverign

Yesterdays assignment was to Survey this Sovereign Sunbridge 34 for Pre Purchase.

The Sovereign range was one of the last designs by Bounty. The Sunbridge 34 version was built as both a dual helm model, featuring both external helm and a second located in the central saloon, and single helm models. The single helm had just the external helm, with folding canopy over. The galley and forward bathroom layouts changed as did the saloon layout which offered an even more sociable area with additional seating space.

Bounty Boats was formed by Mike Brister, and in 1968 was sold to Peter Brown. At the time the company was a small hirefleet of assorted craft, based at Brundall on the Norfolk Broads.

Sunbridge 34, Standard Dimensions:

Length: 34ft (10.39m)
Beam: 12ft 4‘ (3.77m)
Draft: 2ft 6‘ (0.76m)
Airdraft: 2.6m
Displacement: 6.6 tons

Marine Surveyor Norfolk Broads

Welcome to Insight Marine Surveys Ltd

I have been Surveying boats since 1995. By 2013 I have completed over 3000 surveys, which included 100's of types of sail and power boats. Being based in East Anglia on the Norfolk Broads in South East England I also specialise in Inland Cruisers, Ex Hire Boats and Classic Timber Motor Boats and Yachts.

I provide a range of Marine Surveys including Pre-Purchase Surveys, Hull Surveys, Systems Surveys, Sea Trials, Insurance Surveys, Valuation Reports, Boat Safety Scheme Examinations and Finance Surveys. 

 

http://www.insightmarinesurveyors.co.uk/

Battery cables - sizes

Even with boats with BSS certificates, I keep seeing small cables connected to batteries. Might be worth checking yours this winter!

CABLE (master switch in positive wire) MIN. SIZE
Master switch(1) to starter battery 25mm sq
Master switc...h(1) to starter solenoid 25mm sq
Starter battery to engine negative post 25mm sq
Engine negative post to alternator 10mm sq
Alternator to blocking diode 10mm sq
Blocking diode to batteries 10mm sq
Master switch(2) to service batteries 25mm sq
Master switch (2) to blocking diode 10mm sq
Master switch (2) to distribution box 10mm sq
Services negative post to service battery 10mm sq

 

 

Asking for trouble!

This shore power cable was live...

Batteries - gas- some thought required!  

Bourne 35 for sale

I was back in Brundall again today carrying out an Insurance Survey on this Classic Broads Cruiser. 

The Bourne 35 was designed by R.M. 'Rip' Martins in the early 1960's and built by a Nottingham firm called Bourne Plastics, after the work was turned down by Halmatic. The original order was for twelve hulls, six for R.Moores and six for Herbert Woods, the first hull being delivered in 1962. He then set up the name 'Griffin Craft' to market the hulls. Originally known as the Griffin 35, it soon became known as the Bourne 35.

She is up for sale!.... if anyone's interested please email me at steventruss1@aol.com 

Aquafibre also moulded the 35ft hull, originally designed by Rip Martins which became the basis of the Aquafibre 35, and a number of old Bourne 35s have been renovated by replacing the wooden superstructure with a modern Aquafibre 35 design.

Surveyors comments: I have Surveyed dozens of this ‘marc’ over the years. They are very popular for owners wanting that wooden boat look but with the simplicity of at fibreglass hull. Have someone qualified, either a surveyor or boat builder to check the wooden superstructure and decks thoroughly. You will find some rot! Check the hull (underbody) for any serious osmotic defects. The hulls are thick so there’s never normally a structural issue, but big blisters could de-value the boat and make her difficult to sell. Apart from the wooden superstructure they normally survey very well. An attractive Classic Broads Cruiser which hold their value. A very good one will fetch £35K.

Thinking of Buying a Boat and Need Help? I specialise in Boats of all types, and I will assist you to make an informed decision. Contact me for a detailed and comprehensive report at: steventruss1@aol.com