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The comparison of power between electric and ice is nowhere near as simple as how you put it. Torque curves are more important to look at than overall power when coming to boat propulsion. You can technically move a laden cargo container with a 1hp engine if the water is still. Electric motors are peak torque right from the beginning and drop off after a rated rpm. Ice engines are the reverse. This means that if you spec the right motor, you can use a lower powered electric motor than engine. How lower? Depends on the motor. I'm looking at replacing 2x225hp diesel engines. 225hp is 157kw. But I have found a 75kw motor that produces the same torque at a higher rpm as the engine it will be replacing.

6000 plus KG in batteries........... BS

Most people don't want to produce less co2 they just want to look like they produce less co2 so they can complain that no one else cares as much as they do. It's virtue signaling and boring. Don't get me wrong, I don't want to harm the environment any more than is necessary for optimal efficiency, it saves money, and wears less on your machinery, but also does less to harm the environment.

Not bad. Ice propeller interaction could compliment this video and your cavitation video.

Water is a excellent radiation shielding material. The Earth magnetosphere and atmosphere protect us from most of the radiation from the sun and other sources. The problem is it weighs a lot.

Hope you can collab with Drach or HI Sutton in the future.

The biggest problem with pykrete on other worlds, especially the Moon and Mars is that while it may not melt, it will sublimate. And that still assumes you have a good fibrous material because wood isn't very common on other planets.

I love your videos, nothing else fuels my fantasies about bulding a self-sufficient sailboat to live and chill in those conditions, like these videos!

But on the other planets there are no wooden sawdust. So pykrete as such is not an option. However it is possible to use other materials as fiber-reinforcement. For example a basalt fiber.

In Titan it could work, the mountains are made from water there

Hi Nick I was watch this flight simulator for an airbus czcams.com/video/yCmYhuhwTV4/video.htmlsi=BPBpiin92XImfcUn Have you seen or know someone who has done a movie on the flight management system of a seaplane that can land or take of from either land or water? What are the extensions that are required to the flight management software? What are the extensions required for an ekoplane which uses ground effect? I have seen reports ekoplanes can fly at 300 to 400 knots (faster than the average yatch). The video also shows that the helm has 2 axes of rotation unlike a normal yatch. Regards Philip

Have anyone tested a combination of water jet propulsion and propellers? For example waterjet engine in the middle and two IPS engines on each side? You could program the waterjet to turn off between 8-25 knots for efficiancy

This is absolute bogus.

I remember there an old saying - "best Bluewater designs start with worst case scenario, the boat upside-down in the Ocean" ..... this is an issue for Catamarans and Trimarans

Where is this diffuser is located? At the entrance of duct? Or inside the duct? Or at its outer borders?

Impressive presentation. You're the expert, which I certainly am not, but I don't think you really answered the question of why trimarans today are relatively unpopular compared to cats.

When a jet is working, its geometry is tilted, and so water comes into a chamber straight, and so exhausted with some angle into a surface. So, is it above or below a water line initially no more maters then imho.

When doing a side plan, front plan, and back plan of a ship. I noticed the vertical going from the bottom of the ship to the top of the ship. What is the measurement between line and how is that determined to help make the 3d model

Excellent presentation. Thank you.

It was only a Churchillian obsession. The brainstormer managed to get his ideea to Churchill who got mesmerised by it.

Refrigeration? Refrigeration? Refrigeration?

Im from wyoming -15C isn't even cold. I'm also an hvac tech so if anyone wants to bankroll a pykrete boat im down

Don't fight nature: I guess that means we won't be seeing Sodium hulls? :D

LOL. Dr. Alexander Clarke and Drachinifel have both covered the plan. Lots of naval history folks know the story.

Pycrete is one of my favorite crazy historical footnotes. I'm actually dropping a reference to it in a novel I'm writing now.

I would like to see a project now!!

I'm subscribed!

Nobody is gonna burn 36 hours at wide open throttle. You are gonna burn your engine. Compare both at 3-5 kw for 12 hours and you'll see

U WAS an little wannabe on a ship and belive you know it all. From 1 ship of your learning. All ur info gat loaded down from DARKWEB #clown

Scamer ladyboy scam you for get shaty profucts

It seems like most comments here are referring to blow boats. Every blow boater I know brags that he isn't burdened by fuel range or mechanical failure (as they repair a mast, sail, or rigging from storm damage) so why is it you all seem so concerned about propulsion? You say you don't need it but you act like you can't live without it. No way on Gods green earth that I would attempt to cross the Gulf Of Mexico or even Lake Michigan with only battery power. No mater what kind of batteries and on top of that I would feel very much safer sleeping on top of a tank of gasoline than the type of batteries needed for this type of operation namely lithium. A pontoon boat with electric power on a small lake or pond? Sure! The amount and size of batteries for this could be setup to easily scuttle them if needed. It would be fun and advantageous for just putting around and just cruising and socializing. No mater what many of you think electric cars have major problems and putting those problems on a large pleasure boat would be problematic at best and possibly life threatening in several different ways.

They face all the same reasons the world stopped using wind propulsion. Sea states above 5, doldrums, slow speeds, and hurricane avoidance to name just a few. It's not that we can't design/build a sailing ship, it is that we can't make one with the same capabilities as a modern-day diesel-fueled or nuclear ship of any significant displacement. Sure, build them light, yes, but, at some point I see them restricted to low deadweight capacity. And that means world trade and shipping companies would be taking a big hit in its industry and we all know what happens to the world when that happens. The question is, does physics support the idea that wind propulsion maintains the same capabilities as modern ships? I doubt physics today allows us to build a sailing ship that can maintain a steady 22 knots across the ocean unless it is a hybrid. Nevertheless, give it a shot but, when it comes to money, money will win.

I have a dream to build a hybrid, foiled PWC. Amazing to have access to this sort of education.

Surge stability seems worth noting as a theoretical lesson but it’s hard to fathom when that would ever become an issue.

I would say the words myth and lies are unnecessarily negative and click bait. For example:It should be pretty clear that „peak power „ is something different than „continuous power „ and the words are pretty self explanatory. Second point about range: We own a sailboat in the Bay Area. With our diesel engine we could motor days on end. Every three month or so we fill up on diesel because our gauge seems unreliable. There have been instances where I went to the gas station and filled up one gallon. For our boat and use you could argue that our diesel system / tank is mismatched to our use. An electric system with a range of 40 miles would be more than enough including safety range. This evaluation is off course personal but I think it would apply to most sail bouts in the San Francisco bay. I crossed the pacific ones and on my trip to the Galapagos was becalmed for a week.There it was great to be able to motor through this zone. But to go slow in a becalmed area could also be an acceptable option to extend electric range. Every oil change I deal with this toxic sludge. Even drops of it can contaminate large amounts of water. That doesn’t fit at all to the sport of sailing to me.

great channel

Thank you, amazing video and delivery! Has anyone designed a medium sized PC2 sailboat, with keel and all? One which wouldn't mind being frozen and continue as if nothing happened in the spring, provided there's enough food and fuel onboard.

1. the aeroplane Lancaster have skot and stringlers aligned 45 degree, the roder and highroder screv the rear end of the plane. You have propellerblade and roder also. 2. You use I or H steel, what about J steel, lower weight is the result. 3. Thank you.😊

ان فديوهاتك والمعلومات مفيده جدا ... شكرا لك على مجهودك

What a joke maybe a year ago this made sense but now things are so much better and in another year they'll be way better

Sailing ships have a lot of torsional stress because there's a twisting moment in the frame where the mast is attached. For modern ships to have sufficient torsional strength will likely require an extensive redesign versus what's built today possibly including hull shape changes and diagonal stringers.

Hydrodynamics and hull design, performance dynamics matters but what about this coming category, solar powered boating? Slower and efficient hull design matter for unlimited travel, what should an electric boat buyers look for? If i had to guess, i’d say a sailboat hull without a keel and a plumb bow, but i’m neither a boat architect and not a boat owner.

Nobody considers pure EV ships as of 2024. I was thinking about hybrids like Diesel Electric trains which are efficient.

Electric propulsion is much more reliable and requires almost no maintenance.

Well, the performance and energy density of LiFePO4 is only about a third to a quarter that of the leading LCA batteries. This is why practically ZERO electric cars use LFP batteries. This is also why diesel-electric submarines looking for an all electric alternative to Air Independent Propulsion (eg. the JMSDF Oryu and Taigei classes) do not use LFP batteries in spite of their paramount interest in safety. High energy Lithium (everything from LCO to LCA) can be safe if there is a proper charge/discharge management circuit and LIQUID COOLING of the cells. Typically, water bladders (Tesla) or channels (most other EVs with larger format prismatics) between cell banks circulated to a radiator. The key here is that battery should be purchased as a certified SYSTEM with integrated charge and cooling management, rather than as piece meal cells and controllers. If that is too difficult, consider off-the-shelf integrated terrestrial or adapting an existing automotive solution. These go up to about 100~200 kWh. If you need more than that, you probably have a superyacht and you can afford to hire and engineering firm!

Drydock with sails. Ship would exit port by tug boat, be picked up by drydock with sails,be delivered to tug boats at new port. Drydock would stay in the ocean and be resupplied by tender.

Ships use kite long time

Hi dont gat a clue for 100 fot and down

Kite

Hi is so dumb i belive hi is one of thos who cant afford real bstterys