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Do you do any consulting for smaller catamaran sailboat designs, or is a smaller project not worth your time?

Thanks for this. While it seems much of the numbers are based on current tech, where is the future? I love the idea of electric motoring using solar, albeit the slower pace (6nmh). How many knots would ten 400w panels provide for an unlimited range depending on sunlight for a 35’ cruising e-boat (e.g., a saxdor 320gtc with an extended roofline)? Distance desires, combustion requires route detours and refueling at very hight costs and there’s maintenance and noise pollution. The solar catamarans like soleil seem quite interesting, but 55’ is too much boat for me.

Who do you take me for? For an idiot? You're wrong. Only an idiot can compare an engine that is incorrectly connected directly to the shaft and a gearbox that is correctly connected. If you connect the gearbox incorrectly, losses can be more than 50%. Only an idiot would try to keep going at peak power all the time. That's why it's peak, because it works for a short time. And most importantly, only an idiot can forget that the efficiency of electric motors is many times higher. Therefore, a hybrid installation will ALWAYS be more efficient than a purely diesel one. Look at hybrid cars. Everything has been calculated there for a long time. Or look at mining dump trucks. Which have a lifting capacity of more than 400 tons. All the leading manufacturers there have been making only hybrid circuits for more than 60 years. For example, there are Belarusian BelAZs. So they are ALL serial hybrids. I don't remember that the USSR had a shortage of oil. Everyone should understand that if you can't refuel a yacht with diesel, it will stop very soon. An electric motor with a Joule of fuel energy will do more work than a diesel engine with the same joule of diesel fuel energy.

Hi nick. I was astounded to read that cruise ships gain stability by having a wide beam. But this means a lot of extra power is required. Why are cruise ships not bluilt as trimerans or quinmerans? Thanks Philip

i wonder if anyone ever tought of putting a CVT gearbox on the back of the diesel engine. that way the diesel can run at its most efficient rpm ( 2000 rpm for example ) and the input rpm of the jet can be varied by the use of the CVT gearbox so basically the engine runs a constant rpm and then use the CVT to vary the jets rpm or have a variable outlet size like usd on military jet engines

Well.

You forgot that diesel engines are the cleanest co2 engines. They make the most out of a liter diesel. Less co2 vs more ultra fine particle emission. Obviously you can fuel up with TLG diesel what is very clean.

Would it be possible to make a sailing tanker? I have this idea of shipping water from the mouth of the Amazon to the Sahara, but I suspect fuel cost would make it infeasible, but that it might be with sails. Also is there any benefit to a catamaran if it is very heavy? Would the increased righting moment and hull fineness make up for the increased wetted surface compared to a monohull of the same displacement?

Thanks for the video! I enjoyed having this float across my recommended videos feed. I noticed that the audio seems to be just a little bit ahead of the video. Maybe a quarter second or so. The script writing, images, transitions, and everything else are great; just that little desync. 🙂

RUclips suddenly suggested this video. It was quite interesting, thank you

Random curiosity... I found a cargo plane at an airport for sale and was wondering if it is feasible to take the wings off and turn them leading edge down to make the twin hulls of a catamaran, using the rest of the plane in the construction of the cabin living quarters etc.?

Thanks for the video! Since were on the topic of breaking ice. Can you make a video about ice strengthened ships? Ships with a seemingly traditional hull designs but have an ice class rating. Whenever I try to look up information about them, a lot of the information is more on purpose built icebreakers.

Damn it man - slopped armour goes back to Classical times. Get it bloody right. Edited to add: RCGS Resolute 1, Venezuelan Navy 0.

Please, think of the kittens!

It's very interesting but a point regards the camera work. Don't listen to RUclips about filming you from an angle. It's distracting at best. You are facing to the side, instinctively people are going to wonder *what* you are looking at. It works if you are addressing something on the screen but otherwise it doesn't. YT seems to advise everyone to do these trick camera angles.

Nice

I appreciate this video. I've been daydreaming about building a sailing catamaran for chartering pacific crossings or as a packetship/light freighter. But I live really far from an ocean and there's lots of neat things I could do with a motor-cat on the closer lakes or rivers without running up a wild fuel bill

Have you seen the DIY project underway over at RAN Sailing? I think it's amazing. It's a 50ft monohull, cedar strip sandwiched in fiberglass

Why tanks don't have a kind of an air balloon inside to fill the empty volume?

Thanks for the video

I am curious as to how the X-bow would work on a catamaran or trimaran.

What is difference between 1.2 and 1.8 length width ratio thanks philip

After watching this presentation on RUclips, I want to express my appreciation to all who provide this content. Thank you!

This clip should be forced to put at the start of any Build your own boat video on RUclips. ps. Umm I mean MUST!

any contact number

Ndlogok mumet sirahku

What hull type would you use for your imaginary superyacht?

Amusing that everything I know about civil naval architecture is from you, while I have first hand experience with all modern US nuclear powered naval vessels (and know a lot about battleship architecture, but that’s just for fun). The amusing part about this video is scaling: you implied that 10,000 shaft power is a lot for the 1940’s and are talking about diesel, while real power from that era was steam turbine, which necessarily decouples the generator (boiler) from the motor (turbine), with the Iowa class battleships being illustrative - 8 engine rooms and 210,000 shaft horsepower, while the A2W reactors we put in CVN-65 (USS Enterprise) gave it 210MW capacity for 280,000 shp for propulsion….. compared to the 60MW on the Russian icebreaker or the 700MW thermal power from each of the A1Bs in the USS Ford (plus ~300,000 shp - the real numbers are all still classified and depends on application, but the difference in scale is the neat part).

Great.. now I want to make a 12' catamaran fishing boat. I've just bought a dhingy and started the process of rebuilding it to my liking.

It's a big question 😍☺☺☺☺

How does the x-bow compare with SWATH?

How does a SWATH compare with a x-bow?

The whole guessing the weight bit is fine until your designing an ocean liner. How much do the cabin furnishings weigh? No clue. How much does the loose cargo weigh? No clue. Take a blind guess and refine it later, then do the whole thing again until its right? Yes. Yes of course.

With a metal trimeran which is best aluminium or stainless steel

In the attached video are there a means to dynanically adjust the hydrofouls ruclips.net/video/QxLz7mT6tGs/видео.htmlsi=e_7TcYuR6QFc5aJM

I just helped, as a volunteer crew member of a commercial sailing vessel, with a stability test. I had to refrain myself from asking too many questions of the Coasties and our Naval Architect; your videos answered the ones I had. Thanks!

Do you show somewhere an efficiency comparison between propeller vs. waterjet? the baseline efficiency is always difference between ship speed and speed of accelerated water from the propeller or jet..... I am also not quite sure what efficiency relation you are referring to in the slide shown?

Ice breakers serve to keep sea lanes open so goods can be traded Clue me up, who trades at the Norff Pole other than Santa and Elmo the clown??

How do you copywright or patent your deign before you give the plans to the ship yard

Great video

Interesting. Thanks. Typo - slide 11, heating. One size should be one side.

What values does the engineer set for the boundaries?

Great video. Basically confirms everything I already know. And how I know is about 12 years ago after years of racing rc cars I had decided to get into boats, but I wanted to custom build my own. Part way into build while researching stern drives I came across jet pumps made by a company called Graupner. Having a huge love for jet engines I was immediately intrigued. I ended up purchasing a 29mm jet pump with reverser for $80-90. It came completely unassembled so I had to put together which sounded easy (YEAH RIGHT!) Was a pain cuz there was only fraction of mm between impeller & side wall. So lining the drive shaft had to be PERFECT or impeller would scrape. Almost didn't think I was gonna pull it off but somehow I did. All I know is in the years since that thing has taught me ALOT about both the physics as well as the design of those amazing things lol. I still have it which I've installed into a "drive-box" that I use to demonstrate to people. It might only be 1 1/2" diameter and about 10" long but when coupled with a 40k rpm brushless motor it will shoot water 40-50 feet. Impressive little thing. All I know is mostly through observing it and the video essentially just confirmed it all.

I read an old Pop Mech magazine (late 1980's, I think) years ago where the Soviet nuke icebreakers helped save whales stranded in alaska.

wondrful .. thank you

A point of nomenclature: for Naval (ie: USCG) and Navy vessels, a "class" refers to a single design. Hence, "Polar Class" specifically means either USCGC POLAR STAR or the ex-USCGC POLAR SEA (both rated at 70,000hp/51.5Kw). The medium-duty, ice-breaking research vessel HEALY is not a "Polar Class," capable though she is.

Quality explanations as always. Nuclear Ice breakers are Even more fascinating than "standard" ice breaker.

I actually helped build the Healy (WAGB-20). At the time, I was working in the plate shop at the shipyard, where we cut and formed all the steel plates that make up the ship. Good times.

USCG has been trying for decades to get money for a new (fleet of, or at least a single) Polar class ice breaker. Russia has had so much trouble getting funding to maintain theirs that they offer really really cool cruises over the Pole on them. Which in a more ideal world I’d leap at the opportunity (even if not nearly as interesting and diverse a trip as the North East Passage trips occasionally offered).

This is old vid, if you catch this, I feel you would be interesting to follow modern sailing designs, current Americas cup as well as some ocean racing of Europe, from the foiling/non-foil trans mini 6.5’s to extreme 100’ trimarans