BWSeaCat Ltd

BWSeaCat Ltd Designers and builders of fuel efficient Displacement Power Catamarans. Many custom design options available.

Save money on fuel, make more profit for your marine business. BWSeaCat Ltd is a small company dedicated to the design and production of bespoke Displacement Power Catamarans in a variety of lengths and layouts to suit most applications in the Commercial Marine sector. Ranging from Survey to Charter, Commercial Fishing to Leisure, BWSeaCat aim to supply their customers with a solid affordable working platform, whatever the weather, whatever the job.

Engine bays stripped, old engine beds cut out, everything ground out and cleaned, new engine beds bonded in and then eve...
25/02/2025

Engine bays stripped, old engine beds cut out, everything ground out and cleaned, new engine beds bonded in and then everything re-flowcoated, ready for the new engines to be dropped in...

Recent work on our Hybrid project.Alongside the diesel electric conversion, we have also been tasked with various improv...
20/02/2025

Recent work on our Hybrid project.

Alongside the diesel electric conversion, we have also been tasked with various improvements to the original layout of the vessel.

This has included a new and improved pot table arrangement, which rather than being a one piece unit like the last one, now consists of a fixed section and a hinged piece, allowing easy access to the forward section of the vessel.
These will have a stainless top when finished for wear resistance.

In the forward area, the old raised foredeck has been halved, to produce a recessed section, enabling safer anchoring and mooring.

The new, longer engine beds are now being bonded in and will accomodate the diesel electric propulsion systems, based around an arrangement using six engine feet rather than the standard four, to provide additional support for the electric motors...

Because the forward hatch drain holes come out each side partially in the deck shelf radius, we couldn't use a regular ...
06/02/2025

Because the forward hatch drain holes come out each side partially in the deck shelf radius, we couldn't use a regular shell vent to shelter them.

Sometimes you have to use what's lying around, in this case a paper cup.
Bit of tape and laminate, followed by some trimming and sanding and there you have it.
A pair of custom moulded shell vents...

A good deal of trial and error with the expanding foam, but the end result looks good...
04/02/2025

A good deal of trial and error with the expanding foam, but the end result looks good...

On the E-Worker, the drains are in for the forward hatch frame. This hatch will give direct access to the bow thruster.T...
04/02/2025

On the E-Worker, the drains are in for the forward hatch frame. This hatch will give direct access to the bow thruster.
The compartments either side of the main longitudinals will be foam filled, so these drains have to go in first.
We will make custom scoops to direct the water flow around the exit holes...

Back on the E-Worker, conduits have been bonded in under what will be the main battery pack compartment , allowing the p...
30/01/2025

Back on the E-Worker, conduits have been bonded in under what will be the main battery pack compartment , allowing the passage of cabling, steering hoses and bilge pipes from up forward to the aft compartment.

The custom made deck hatch and frame, have also been dry fitted.
This will allow easy access to the bow thruster once installed...

Both engine rooms have been fully stripped and the Port one is now cleaned and ground out, having had the engine beds cu...
30/01/2025

Both engine rooms have been fully stripped and the Port one is now cleaned and ground out, having had the engine beds cut out.
New beds will be made and bonded in, to support the new engines and electric drive system...

As a side project to deepen our knowledge and understanding of the viability of fully electric propulsion for vessels mo...
28/01/2025

As a side project to deepen our knowledge and understanding of the viability of fully electric propulsion for vessels moving forward, we are currently building a version of the established SeaDancer hull form, as an open launch. (Yes, we know it isn't a Catamaran!)

This launch, to be known as the 'E-Worker', will be a simple and robust, fully electric work vessel, designed for use in marinas and boatyards and indeed for any duties where quietness of operation, marine pollution and the environment in general, are legitimate concerns.

Utilising twin 40Kw battery packs and a powerful motor, swinging a large propeller, we hope that this design will prove useful and popular, as a powerful tool for marine operations.

She will be an open design with simple console and seating for two. A strong layup and robust framing will be backed up by a flush deck to give a safe and stable working platform.

This vessel will have her debut at SeaWork 2025 and we hope to see many of you there...

Behind closed doors, work has been progressing nicely on our hybrid diesel-electric project.This vessel, originally buil...
28/01/2025

Behind closed doors, work has been progressing nicely on our hybrid diesel-electric project.

This vessel, originally built by us many years ago, is still owned and operated by her original owner up in North Wales as a commercial fishing boat.

The idea for this conversion, is for the vessel to steam to her fishing grounds using conventional diesel engines, but then to switch to electric drive when on the gear and to utilise an electric power pack to power the hydraulic systems, taking power from the main twin 40Kw battery packs.

We have undertaken extensive hull modification work to both counter the extra weight of the batteries, but also to improve the overall balance of the vessel during slow speed operation, where she spends the majority of her time.

To this end we have designed and fitted twin 400L bulbous bows and large additional laminated foam sections on the inner sides of the tunnel.

With this major work completed, the focus will shift to the refit using new main engines and electric motors.

The future of boating is electric and by gaining experience from projects such as this, we hope in the future that fully electric 11m SeaCats will become a reality...

The first stage of our major re-fit and re-power of one of our older vessels...She will be having Hybrid electric propul...
04/11/2024

The first stage of our major re-fit and re-power of one of our older vessels...

She will be having Hybrid electric propulsion, in order that the electric motors can be used when manoeuvring slowly around the fishing gear, thus saving diesel.

As part of this slow speed operation (where the vessel spends the majority of its time) we have fitted bow bulbs to dampen any pitching motion experienced on board.
This will increase comfort and thus the working efficiency, of those on board.

The next step will be the addition of foam sections to the inner portions of the hulls aft, within the tunnel, which in conjunction with the bulbs, will ensure a NET zero change in waterline after the addition of the hybrid equipment (batteries, motors etc)...

Interesting project incoming...Another of our previous builds is back for some work.This time, a major refit, including ...
06/10/2024

Interesting project incoming...

Another of our previous builds is back for some work.

This time, a major refit, including various hull adaptations and an electric hybrid drive system.

A massive challenge and learning curve, but one which we are looking forward to.

20/06/2024

Testimonial from one of our skippers up in Milford Haven from a recent Shark trip. Its always nice to hear that the design is working as intended and more importantly in the current financial climate, saving on those all important fuel costs, without sacrificing on performance...

Hi Ben, went out shark fishing yesterday. Had to send u a message as it’s the furthest out and hardest I have ever run the boat.

We went 46 miles offshore SSW of the heads. The forecast was 0.9m every 5 seconds. 15 knots of wind ended up at least 1.5m and 20 knots of wind. We fast cruised out circ 2900 rpm averaging 21 knots with the swell up her arse. She performed perfectly not broaching or stuffing the bow once. The boat sat beam on all day remarkable comfortable. I was dreading the trip back as we had drifted 6 miles further south, so at this point I was dreading the 50 mile steam home against the elements. Opened her up and against 20knots of wind waves on the stbd bow and 1.5m every 5 seconds swell on the port bow we averaged 16 knots on the way home, the engines were loosing 300 rpm climbing up the waves, turbos howling down to 13.5 knots , with most of the boat out of the water. Over the course of 50 scruffy miles we probably hard slammed 15 times mainly due to rouge waves. Everyone onboard was very impressed. Couple of the shark anglers commented that it was the best boat they had ever been on. If any future customer wants to chat about it give them my number 👍.

Total mileage 110nm, plus 2.5 hours of engines used to fight the fish - spinning the boat around etc etc… 260 litres … 2.4 litres a mile. 2900 rpm on the way out 2500 on the way home.

Address

Unit 10, Wicormarine, Cranleigh Road,

PO16 9DR

Opening Hours

Monday 07:00 - 18:00
Tuesday 07:00 - 18:00
Wednesday 07:00 - 18:00
Thursday 07:00 - 18:00
Friday 07:00 - 18:00
Saturday 07:00 - 15:00

Telephone

+441329236995

Website

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