fishing trawler to pleasure conversion

[James Wellington]

Care to share that evidence? I am really curios to see how they did it.

Physics tells me that every conversion step consumes energy. A straight diesel driveline has two steps, diesel to mechanical work via the engine, and mechanical work to mechanical work via transmission. A diesel-electric has four steps, engine, generator, VFD or chopper, motor. A hybrid adds two more, converting electricity to chemical energy (battery) then back to electricity.
The engine efficiency between passagemaking at constant rpm and generator duty is not very different, so the comparison is between losses in the mechanical or hydraulic transmission and all the electrical conversion steps.

In serial, right from genset or batteries, or both directly to the electric motor....no transmission needed. ALL those big famous companies arent going electric because it doesnt make sense, but becauae it does. If youre not aware of tons of research, tons of lit over many years, thats your problem. Study up..

 

[James Wellington]

For the same reason the boat I talk about did it, gubmint money....

It works in a lot of other areas where there is lots of excess energy or other linked inverse loads.

Big band design outfit designed one about a decade ago maybe smidgen more. The power generation was managed by generators larger than the propulsion required. It's sister ship operated with two smaller cats with two larger cats for power one for Maine and one for backup. An attempt to balance the load better put five cats in series. The idea that the processing was most energy intensive when propulsion was least, reciprocal being also true. Turns out it didn't take long for the wind to blow in peak fishing, requiring all power all the time making for the illustrious more fuel green plan. In optimum conditions, it appeared to work OK as it does very successfully in the cruise industry. The design Co was smart enough to have it pre-designed for ice engines and rather quickly it was converted to good old fashioned diesel.


In the 50 to 60 foot range the boats that successfully do hybrid for more than just driving around the harbor, look like racing catamarans. Weights, windward areas and latitude ranges are all very carefully considered. The other group sells hybrid more as a lifestyle accessory. One I read recently advertised silent dinner cruises around the harbor as a selling point. Fine print mentions the pesky range reality.

Big old slab sided hogs were talking about.... not so much.

My OP mentioned a 63'one that is a fish boat, not just for harbours. All the big european builders are building fishing and other boats in hybrid, as do the long distance yacht makers. It seems many american arent familiar with this though.

 

[James Wellington]

https://dataintelo.com/report/hybrid-boats-market/

 

[James Wellington]

Beautiful enginroom of another -boat, a 22 meter, by Kewatec Finland.

 

[James Wellington]

Here is some tech info from the German MAN company.

https://www.man.eu/ntg_media/media/...dukte/marine_1/Marine_Hybrid_Broschure_DE.pdf

 

[gonzo]

With 8 generators it must have been some huge ship, not the small ones like we're talking about, 50-80 feet snd such..

It works of bigger vessels that can justify the expense. For us, precise speed control was a constraint.

 

[James Wellington]

Update: We just received a reply from the Damen shipbuilder about their 2007. They informed us that as other naval architects have, that this boat can indeed be configured as a purely pleasure boat. In its basic configuration, the price is about 3.5 - 4 million Euros. (note that the Seaton 60 is also about the same price). They just factor in, or out whatever changes are necessary, or desired. For example, all that fishing related equipment like ice machines isnt needed, nor the massive crane.
Thus its a doable project for those who like industrial style boats.

 

[comfisherman]

Well, glad you got a price.

To answer the earlier observation, usa fishing fleets only adopted it when heavily subsidized. Our nations fisheries rely very little on subsidy, mainly due to America not eating much fish. One of the thing that blows me away when talking to fisherman from other developed countries is how much subsidy they have received over the last couple decades.

Heck most those guys will move heaven and earth to avoid tier 3 compliance, willingly adopting hybrid is gonna be a stretch.

 

[James Wellington]

Well, glad you got a price.

To answer the earlier observation, usa fishing fleets only adopted it when heavily subsidized. Our nations fisheries rely very little on subsidy, mainly due to America not eating much fish. One of the thing that blows me away when talking to fisherman from other developed countries is how much subsidy they have received over the last couple decades.

Heck most those guys will move heaven and earth to avoid tier 3 compliance, willingly adopting hybrid is gonna be a stretch.

Comfisherman. Thanks for the info about the US fishing situation, but that is a different topic. This boat isnt made in the US, nor will be registered there. And the price of an american made Wahl 'famous 58' boat, is about the same price, new. I think they have a 600hp motor.

 

[comfisherman]

Yeah 2.6 is the bare bones version. Most finish near enough to 3. Hard to track what came std but the 26s were mostly 19 liter cummins. Local guy went cat and then Mitsubishi on the 28.5. Seems like the last few have been Mitsubishi. It's Wahl, it's whatever is the absolute cheapest unless buyer specifies something.

They are as infamous as they are famous up here. Local joint has a drink that's lots of ice with some kind of hard alcohol in it, in a giant bowl.... called a Wahl on the rocks. Lord knows most the first dozen have done the same at least once, some 3 or 4 times. Only the capn Andrew and kodiak aisle were lost. The patch them up realign the engines and off they go.

If Google finds it, the van peer chasina bay was about as close as I can think in recent memory. Dunno it's current name but it's about what your descibing.

 

[starcmr]

Well, the bridge may be in the wrong place.

I am not your expert, but one must assume the bridge was placed with some consideration of load which means the bridge is wrong for a no load boat. Determining typical operating conditions might help. That is, does she run with a certain amount of mass in the holds typ.

The vessel, capable of great load, would also be costlier to operate than a vessel not designed for such massive loads.

I will tune in for more expert discussion on Belize fishing excursions, but say a few words to get alerts on the thread.

I don't think it ideal at all, I'm afraid it will be far more costly to run than needed. So, you also ought to mention intended use and consider fuel economy and range.

To convert the Damen 2007 longliner into a pleasure boat, naval architects would need to adjust the weight distribution and add ballast to compensate for the removed fish storage, ensuring the vessel remains stable. The interior would be redesigned for cabins, lounges, and storage instead of fish holds, while the main deck would be closed in and weatherproofed to maintain structural integrity and watertightness. The power and propulsion system would be reconfigured for cruising, possibly with larger battery banks and solar panels. Safety systems would be updated for recreational use, and amenities like HVAC, plumbing, and noise reduction would be added to enhance comfort.

 

[gonzo]

I think that using a design that requires tons of ballast to make it stable enough is not ideal. Hauling a lot of unnecessary weight around is a waste of fuel (including stored electricity). A lower displacement design would be cheaper to build and operate. The cosmetic part can be kept so it looks like a commercial fishing vessel.