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My only advice on this is don't buy one before the launch. The prices are coming down like crazy. I have a few CCTV ones I intend to monitor wildlife with, I plan to install them in the coming weeks to my house to try them out. It comes from a reputable brand, one of the top players in the...

I think CPP is a wonderful piece of technology, but this parallel hybrid system solves the same issue, being able to drive the boat in a wider range of optimal speeds, even better. You can literally drive at 0.1kts, if you want to, with electric engines. CPP is also expensive in a boat of this...

I think you are slowly starting to accept it, your second paragraph is a good start... I think main point is to stop comparing it to a hybrid system in a car. It is not meant to capture inertial energy, a totally different use case. You could "just" have a big BLDC-type motor/generator hooked...

It is not really worth it alone, that I fully agree. But combined effect, replacing one main + wing + 2 x generators by slightly smaller main and this electric wing generator combo, reduction from four diesel motors to two, while maintaining full redundancy of any one single part failing and of...

Even further possibilities for optimization via elimination might be possible: When we have a wing and genset combined into a combo "electric wing", we could next look into wing propulsion itself. How about instead of having an electric wing motor on a shaft with folding propeller and a...

Have you a rough estimate on the power required to drive this hull say 4/5/6/7 kts? Ie. how fast do you see yourself going on electric mode alone, and how much range would there be if slowed down a bit?

Unfortunately, emission standards make this inevitable development in the diesel engine side. Though, as mentioned, once the diesel reformer fuel cells mature, there is a path forward. They have low emissions and very few moving parts, more a steam cooker than a computer :)

Propulsion this is indeed the case, with electric motors having high torque at low speeds. For auxiliary loads like windlass, thrusters, hydraulics provides the control and torque at very low speeds in the same way, so in this regard they are equal.

If you refer to choice of parallel hybrid for the main engine, and potential for downsizing the main, I don't see how it is really that adventurous. Idea behind it is choosing a little smaller main, than what would be chosen otherwise. Lets take a Nordhavn 68 as an example. It is specified...

Power is power, and kilowatt is a kilowatt. What I mean is in order to have that one kilowatt of power transferred to end of the drive shaft of that bow thruster, between 1.5kW and 2kW need to be injected on the PTO end, depending on the pump and motor type - gear, vane, piston, in order of...

True, to a degree. Firstly, direct electric drive has substantially better efficiency. Many tens of percent more. This brings power requirement down, sometimes halves it. Depends on... variables. Secondly, this "electric wing engine" concept we discuss only needs to be sized to supply the...

One "simple" option would be to replace the hydraulic motor of ABT thruster (38hp) with a electric one from Praxis: https://www.praxis-automation.nl/products/electric-propulsion-motor Suitable 25kW motor depends on the RPM of thruster input shaft, but is very light at like 70-80 ish lbs. With...

I think it is not so much the drive for high tech stuff, but eliminating stuff. Typical boat of this class discussed, be it N68 or XPM78, has four diesel engines in the engine room, main + wing + 2 x genset. By combining functions this can be reduced to two diesel engines, main and combo...

I think washdown pump is a natural candidate for being AC-powered. They (AC driven pumps) are widely available, very reliable and can run for unlimited time. Easy to duplicate for added redundancy and/or as a fire/crash pump if one wants to. With sufficient battery bank and multiple inverters AC...

What is actually the maximum hydraulic load needed ever? Both thrusters at max? Windlass should not operate together with them both, not when they're fully loaded, right? I bet not more than 50kW, ever. Am I far off?

Yes makes perfect sense, thanks! Option/alternative would be to have two sets of electric motors, one direct on shaft to drive when transmission on neutral, another direct tied to diesel. Means an extra motor, but saves the clutch in between, more flexibility with rpm ranges. Lots of choices to...

The clutch is which side of the electric motor? Ie with clutch open, can you drive the boat on electric motors alone or charge the batteries with diesels? Or is there another clutch in the marine drive? Just trying to picture this out, sorry if this sounds like a bit stupid question :)

DC generator is a key, a variable RPM type. Something like this: https://www.praxis-automation.nl/uploads/default_site/files/brochures/519.01_DCG.pdf Preferably no hydraulics. If needed, Electric DC motor pumps, multiple in parellel. 10-20kW range, constant displacement type. Ability to run...

I just wrote you a _long_ reply covering these points, but it disappeared. Strange. One point in my missed post was that modern 200kW motor is like 20 kg, liquid cooled. They are not so massive anymore. This is all I could save from my post, I'll put it here anyway, but it was way much more...

Charging lifepo or any lithium chemistry batteries at 1C rate should not _really_ stress them that much, as long as depth of charging is not very "deep" - they do charge them at crazy rates routinely in the EV world. Ie. charging at 1C from say 40% DOD -> 80% DOD is not that stressfull. But if...

How about that 80kW DC diesel generator instead of that wing engine? 80 kW is just a rough estimate, but it should equal conventional 160 hp wing engine pretty much. Have backup propulsion as a 80kW electric motor driving the same second shaft with folding prop, or even more ideally 2 smaller...