A bit of a rant, but hear me out.

I'm growing tired of the snake oil advertising niche boat manufacturers make to differentiate themselves from competition - it's absolutely rife in the industry. And lack of regulation is the cause of it all.

Here's an example which recently pissed me off:

There's this Greek shipyard called Technohull which builds high performance RIBs, which do 100 knots. They say it's thanks to their patented Dynastream hull, but I can't find any evidence of the patent (and I've tried), which should be readily available on the google because it's public domain. Looked on the Greek government website - nothing. And if you look through Technohull's website - and somehow make it past the many spelling, grammar and syntax errors - you'll notice how they use extremely generic and gimmicky jargon like "variable deadrise" and "high-precision computer algorithms" to describe their supposedly revolutionary design. Anyone with an elementary understanding of boats can see right through that crap. I mean, almost every modern performance hull has variable deadrise... wtf are they talking about?

And not to mention, the boat chine walks like a mf past 80 knots... surely the hull couldn't have been built to safely do 100. But I digress.

It's not the only semi-famous boat ("luxury yacht" as they like to call it) manufacturer who does that shit. I can list a bunch, like Hysucat (now Bering Marine), and a bunch of bass boat manufacturers who claim they've developed the next groundbreaking hull, when it's just another overpowered bath tub with zero design or engineering merit.

It kills me to see this because it ruins the industry's reputation, and the reputation of serious boat builders who do put in the work to design and develope unique hulls for their customers. Invincible Boats, SeaVee, Hinckley. Even some mass production brands like Chris Craft actually delegate their design to respected naval architectural firms.

This industry needs tighter regulation around the engineering and manufacturing quality of what's being pumped out by these niche builders - if not by principle and by respect of its customers, then surely for safety. The fact that a company like Technohull can fit three Verado 350s on a badly designed hull, and slap an "offshore powerboat" sticker on it and sell it to some guy who's gonna chine walk his way to the grave on 10 foot swells is f****ng asinine. This should be illegal. I don't care what people think.

It wouldn't be legal for a car manufacturer to do that, and boat builders need to be held to the same standards.

This needs to change.

I'm originally from Illinois and I'm currently studying Naval Architecture. I would love to work back home but I haven't found/heard of any jobs in Illinois. Wondering if anyone has heard anything about people working in Illinois with a name degree.

Thanks!

Hello all, I'm a naval architecture and marine engineering student and I would appreciate it, if you fill out the following questionnaire regarding alternative fuels in sea ferries because it will help me with my master's thesis dissertation. I will attach the Microsoft Forms link below. Thank you again fellow ship enthusiasts. https://forms.office.com/Pages/ResponsePage.aspx?id=DQSIkWdsW0yxEjajBLZtrQAAAAAAAAAAAAN__rj3bRRUNExRMzg0MzBHTlRaSUxKNUpQTE1QT1c1RC4u

I did some calculation and found out that the added mass is 902% of the mass of the ship that i designed. Is the ship fuk up? I dont really understand the concept of added mass so im not entirely sure but i do think that my calculation are correct. I hope.

I want to get a NA/ME degree when I go to college, but I’m currently a Junior in high school. Until I graduate, what are some literature or media suggestions that I could immerse myself in to learn more about this field?

I definitely absorb what I read more than watch, however books, videos, documentaries, or even podcasts would be welcomed.

Anything that has helped you learn more, I would like to learn from it too.

Any and all suggestions are appreciated greatly. Thank you.

I am considering taking the naval architecture career path, but my reason for that may be a bit unusual. I was always interested in ships, but I only started thinking about a career in the marine sector after I found a fairly small niche of sandbox games mainly built around shipbuilding. I settled for the game Stormworks. I can share links to some of my builds in the comments if anyone asks for it. But with the story out of the way, I wanted to ask you way more experienced people some questions regarding this:

1. Undoubtedly, there are other people that found naval architecture through such games as well, and some of these people will design our newest ships. What do you think about that?
2. Do you think ships designed by people that joined thanks to these games will have a higher or lower quality? Will they be safer or more dangerous to sail on?
3. Thanks to these games and just the internet in general, the industry has received more publicity (as basically every other industry). What effect would a potential influx of new people have on it?
4. Will this bring new very radical designs and quick advancements, or will the industry move at the pace it has been moving at up until now?
5. Is playing these games with the intention of learning some naval architecture here and there a good idea, or should people that want to do that select more expert softwares for this?

Thanks for reading, would love to hear your opinions on this. If I made any mistakes or if anything doesn't add up, feel free to tell me. I am quite new to this industry.

Does anyone have the complete pages of the PNA - Propulsion 2010? I looked unto it on several free book sites, but its kinda incomplete. I wanted to read the complete one, so I was looking for it here.

*Title should say naval architecture not engineering.

Is there a way for merchant navy officer with dual spec. both Marine engineer and Navigational officer to transition to naval engineering. Also having BSc in both subjects. Would I have to pursue extra education in BS or MS in naval engineering or are there courses you can complete to get certified? We have a alot of certifications in Merchant navy but I am not sure how Naval architecture works. I am able to use SolidWorks, few free software for hull design analysis and similar tools.

Can college grads with degree in mechanical engineering get selected for jobs in naval architecture?

Trying to decide between college acceptances.

1. Mech eng. major at a selective engineering univ and pursue masters in NA/ME later

2. NA/ME for BS

Currently a junior studying name at a different school than Umich with a 3.7 GPA. Was wondering how competitive it is to get into grad school for name at Michigan? There isn't much data on the internet, however looking at the engineering grad school as a whole the median gpa for michgan seemed to be a 3.8 with a 29% acceptance rate. I imagine the name graduate program has to be somewhat less competitive than other disciplines just because of how niche it is but that's just my guess.

Just thought I'd throw this post out here in case somebody has some insight into this. I plan on applying regardless but am interested to see how I'd stack up.

I've always loved ships and designing. I've read EC Tupper’s book and I know how to design with CAD. I've taken several APs, notabl Physics. I'm just struggling with what else to do. I live near Philly USA and I don't know where to intern and stuff, or where I can shadow a professor or even where I should aim for in UNI. Would love to hear you guys’ experiences and tips so that I have an idea.

Hello everyone! I need help on finding the charts for this specific series of propellers for preliminary propeller sizing. Unfortunately, I am unable to find the resources such as the 1967 version of the "Principles of Naval Architecture" or the "Open-water tests with modern propeller forms". If anyone has it, please share it to me, because I'll be needing it for my study. Huhu

Been trying to solve problems on intact stability and often times the Longitudinal Center of Gravity is greater than the ship's length. Is that normal? From what I understand, the LCG is the distance of the CG from the Aft in a longitudinal direction.

I’ve been reading Naval Architecture as a hobby for the past year, and I’m designing a sailboat. I have the calculations for righting moment, heeling moment, rigging and so fourth. But I cannot figure out the hydrostatic Center of lateral resistance (CLR).

I’ve done a flow simulation of my CAD model; viscosity of water, the flow of -3m/s, set boundaries, local mesh and goals. Simulation works and I can visualize the result. My values for torque and force in X, Y and Z seems feasible. Since Torque is in Nm and force is in Newton; I assume Torque is to be divided by force and the result is the distance between origin and CLR in meter. But the result doesn’t make sense…

Are these the correct formulas?

Torque(Z)/Force(Y)=longitudinal lateral resistance(X)

Torque(X)/Force(Y)=Vertical lateral resistance(Z)

What are the renewable energy sources that can be integrated in ship design? I know things such as wind, solar, and hydro power but can this be really efficient enough? WDYT?

Hello
I am a student currently learning Naval Architecture and I was tasked to create a vessel of my choosing and a vessel called a Log Bronc or Log Dozer peaked my interest considering how tiny it was but really useful in many ways. I was wondering if I could ask if anyone here knows the vessels Block coefficient since I have been trying to find the block coefficient of the vessel since a few days ago and I can't seem to find a research paper or anything that talks about its block coefficient. Unless the block coefficient is the same it would be a great help.

How does an engineering education in naval architecture and marine engineering compare to a general undergraduate degree in mechanical or electrical engineering? As a parent of a student interested in engineering and also considering naval schools, I wonder if it is required to be 100% set on entering a maritime career after graduation, or how flexible the degree is preparing for other pathways, grad schools or industries?

Good my Naval Arch Folks. I was wondering if you have any material for methodology for calculating ships squat for Merchant vessels using Barras Formula. Is there a Excel sheet or any material that I can use as reference imm to make one.

I am a Navigational officer on a vessel . Have never learned this topic in college about this Barras Formula. Your help is very much appreciated.

How it's done for a ship with twin propellers?

I'm looking for thesis topics related to Finite Element Analysis (FEA) and shipyard production. Specifically, I'm interested in areas like welding techniques, structural integrity assessment, and production optimization. Any suggestions or insights would be greatly appreciated!

Thanks for the response guys. I am having trouble in understanding the rules of BV.

I have a design in my head for a new type of house boat/craft and I was wondering if someone could help me see if it is possible. Or reference me to somewhere I can discuss a prototype of a semi submerged ocean dwelling.

I know that excel can plot graph, but can it be used to plot hydrostatic graph with all the line in one graph and with all the x-axis with different values?

I tried plotting one by changing the scale of the are m^2 x-axis to fit it into the displacement tonnage x-axis.

I wonder if their is another way to do this?

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Hi.. I want to ask if anyone knows about how to interpolate the values of dry docking side blocks since i was curious that on naval docking plans only single values are given but for the block there should be second value to cater the slope of vessel longitudinally

On our last model of hull for 620 hp we have encountered some trim by stern. The real problem is that this vessel needs to get in reverse from full throttle forward ( for fishing purposes). But while it is put in reverse suddenly from the full throttle forward it doesn't give a satisfactory result and makes a white lather. Never encountered something like this before , please share your opinion ...

I'm a naval architect just graduated, I was working on a local shipyard . They were having a successful design for 495hp engines but for the last few orders the client have asked for a 620hp inbord engine vessel, so the main architect implemented the engine on the same design used for 495hp inboard engine. Then during the trials the vessel had a huge trim by stern which caused the vessel to have less speed than the usual 495 hp design. The length is 77ft and breadth is 16.5ft. can anyone suggest how to rectify this issue and if there is any modifications can be done to the future designs

Hello, I'm a students studying naval architecture and I'm designing an ore bulk carrier for assignment. The Lbp is 177m with 27m beam.

While doing the lines plan of the ship, i simply just open up a few reference of close length sister ships lines plan and just refers to the number of station they have and assume that a 177m ship had 24 station between aft peak bulkhead and collision bulkhead regardless the distance between stations.

But now I wonder if there is any formula to calculate the optimum distance between the station so when back to reading the regulation of classification like Bureau Veritas and also from Marine Insight but i didn't really found anything. What i found is the frame distance from Marine Insight which is 600mm without too much details or a mathematic formula for it.

So is there a way to calculate the distance between station/bulkhead and web frame based on any classification other than referring to sister ship's lines plane and GA?

Thank you in advance.

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I recently came across a symbol which is a capital letter "M" inside a circle, I remember it from uni days but can't for the life of me remember its meaning. Can't find it via Google either. Can anyone tell me what it represents?