How we weighed our 60' sailboat in our backyard. [EP128]
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- Опубликовано: 28 май 2024
- Find out this week how much Duracell weighs, plus, some keel talk.
#boatbuilding #sailing #boatrefit #theduracellproject
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![The Sailor has Arrived [Life Update]](/img/tr.png)
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I am a naval architect, and you did a terrific job of explaining stability. Not the easiest concept but your graphics really helped. Trust me, you can run as many calculations as you want on weight and stability, but you have to hold your breath (at least a little) until you actually weigh the boat and launch it to make sure she doesnt turn over and floats on her designed lines. Very excited to see the finished product of repurposing a real thoroughbred.
@billdeuchler7030, as a Naval Architect, what's the difference (or the same) between determining the CG of a boat and an aircraft (usually done before each flight)?
@@BrianRhodes9763I’m not a certified naval architect, and certainly not an aerospace engineer, but I’ve designed and built some racing multihulls. From my limited understanding, the aircraft Centre of Gravity is a much simpler topic, in practical terms. They want the total weight, to know the power and fuel needs. They need where the centre is fore and aft, to not need constant correction of flight attitude. This they sometimes adjust by moving passengers. They need the same sideways, which they adjust with the wing tanks. The other effects of CG placement are also present on a plane, but barely relevant. The plane operates in one element, the air, which can be turbulent etc, but still only one element. A sailboat operates at the boundary of two elements, air and water, and it exploits the differences between them, which makes it torn between frequently opposing priorities. It’s quite complex, and contains a lot more than what was discussed nicely here.
My partner is a Naval Architect. The explanation gets a thumbs up for a short introductory video piece.
Excellent video as usual, and I appreciate that you wrote a script to make your explanation clear and concise. It Vastly improves the clarity of the message. I think you honestly could do a good job of science education, because you don't talk down to the audience but try to be as clear as possible in the requisite concepts. A+!!!!
Edit: I always find it interesting, as a crafty person (mostly automotive/motorcycles and metalwork), how easy it is to tell a person who is doing a risky thing in a way to maximize risk mitigation from someone who isn't even thinking about it, but how people who don't build things may not be able to tell that difference. I can CLEARLY tell Matt is weighing this as safely as he can.
The most dangerous thing I saw was Matt's concentration being broken by comments and questions. The danger was not Matt being under the boat. The danger was Matt making a measurement mistake which might lead to a miscalculation of the true center of gravity. And thus a lessening of stability in rough seas.
Matt seems well aware of possible mistakes endangering his family. And has been extremely cautious.
Phenomenal patience! There's possibly a time/place for spontaneous wittering but it is certainly not during a high stress operation involving heavy objects!
My father always said: "As long as it creaks, it holds!"
" I wouldnt do this if I thought it wasnt safe" ...said every man ever born!
Not to mention that he actually said “I wouldn’t do this if I didn’t think it wasn’t safe” (at 11:18). 😂
Who says you're not an engineer? That was a master class
This lift is nothing compared to loading, unloading large boats on trailers in a marina. Most of your viewers would have a heart attack watching that process, Matt is being super safe
Nerve wracking. I, for one am glad that's over. Thanks for sharing.
Maybe not an engineer, but you are a good teacher!
One of the best descriptions I have seen on the topic of stability. When you were lifting the boat, I could not help but think where is the inspector.
Excellent video and explanation for those of us who are not in this field. Well done Sir.
811kg over, i think i need my eyes recalibrating! Another good job done Matt. At least weighing baby will not be as strssful, and you dont have to calculate his ceter of gravity😀 Not long now Janni, hope all three of you and the inspector are well. Prayers, love and best wishes from uk, God bless you all ❤
I bought a new talking scale for my diet, and when I tried it for the first time, it said, 'One of you needs to get off! Two times is the charm!
Kudos for actually weighing it instead of going with the estimate! 10% error isn't bad for this kind of estimate, especially if it is based on data collected by someone else a long time ago. And now you have good hull weight and LCG. All of those stability calculations depend a great deal on VCG and that will still need to be estimated, right? The calculations are easy on the computer so you can evaluate a range of VCG scenarios to see how far off you would have to be before performance or safety would suffer. I'd love to see the range of outcomes from that analysis. Your commitment to doing this well is clear :)
Very interesting science, Matt ,I guess also the main thing with a proper blue water yacht is you have to be able to heave too, as you know, can't wait to see what keel design you come up with mate, great work as usual.
The fact that you posted the video means you survived! 🤓
I just left the same reply! Like watching Foresty Forest climb a slope that could avalanche and end him!!
Fascinating. I wonder if adding sacrificial "bumpers" or crumple zones fore and aft of the bolted section of the keel has ever been tried. Evan included an aft section like that in one of his drawings.
Already the 1740th tag-along view. The chaotic music adds to the tension & suspense of the moment. Well done... got everyone biting their fingernails.
You earned the 744th LIKE. :0/
Your layman's explanation was outstanding. I'm halfway through the video and very nervous. I finished the video, and thankfully, you didn't die. Your next project could be a suspense movie. It didn't appear safe, but it didn't roll over.
You gave a good explanation of the center of gravity and the effects on a boat. It was definitely informative. Enjoyed the video.
Love your project! Stacking the load cells in the same position would allow you to compare the readings from both under the same load at the same time.
Here's a thought you've probably already considered, but in case you haven't -- when you're ready to move the boat to the marina, use a truck scale to weigh the trailer before loading the boat and then weigh it again with the boat on board. That will give you another confirmation weight with a lot more of the completed "stuff" in it.
I fell like it would be difficult to find a truck scale that can physically fit this oversized load, or a driver willing to attempt it. They can’t be trucking the boat all over the state just to find a scale that can work. That would be prohibitively expensive.
What about a freeway truck weigh station? I would think that they would put those near ports where shipping comes in - Maybe Port Angeles? Not sure the info is worth the risk of the drive
You did a great job on this complicated engineering subject. I raced for more than twenty years and could never explain what I could "feel" and "sense". Wished I knew you then.😅
Really enjoyed your interview with the Boat Geeks!
I'm a Naval Architect. Just as a note, since you have the total boat weight and the total weights on each of the forward and aft bunks, you can also calculate the longitudinal center of gravity for the boat as it sit on the bunks. That can help with the keel location.
A good sailing class covers Center of Gravity, Center of Moment and Righting Moment as understanding these can make sailing not only more comfortable but also much safer. These topics are not just for the architects and engineers as both sailors and boat owners need to have a good basic understanding too.
Kudos on Matt for helping everyone get a better understanding of this important sailing topic.
Best!
Wow, there is so much involved then just taking a bunch of old stuff out and putting new stuff in, throw up a mast a new sails and sail away into the sunset....my goodness. This was a terrifically interesting video to watch and learn about the physics and everything that goes into boat design, from someone who knows absolutely nothing about this, this is a whole different world. Matt you made it all sound so simple but I can tell that there is nothing simple about any of this at all. Thanks for such a great video!! Sending good energy ....Neil 😊☘☘
The thing about aggressive comments regarding risk is that it is all about the person making the comment and not about you and your risk management.
If there are healthy concerns they will always come across kindly and often in question form.
And I have such confidence in Matt’s ability to measure AND execute excellent risk strategies…I think we are all learning rather than needing to teach.
Very cool episode.
Woaw! That was a real success (and a bit nerv wrecking)! Well done, and good luck with both of tour baby projects!!
The biggest tell that they are doing it safely is that they released this video !!😄
Outstanding
Loved this, you have gained SO much information by doing it. Even I was a bit clenched while watching so can not imagine how you felt. Could see / hear the worry in you both. Well done.
Nice. It's like a combination of boat building and science class.
This was better and more practical than many of the calculus presentations I’ve heard. Doing the math of what the amount of force under the curve is a pretty good use for calculus, and this is a understandable reason to do this calculation.
Very interessant - thanks !
Werner from Germany
Luuuvv the banging bumper music. Eurodisco club scene!!😂
you are a brave man!
Good luck Matt 👍
great fun little project making cradles and weighing something like a boat, i used to do the same for aircraft, jack them up, place em on cradles before wings were removed and the whole aircraft being moved by lorry to another location, great fun job, fortunately the lifting would be very straight forward and the weights produced by the crane, but useful numbers for future reference
Hello from Hildeheim, Lower Saxony, Germany. When you measured your weight, you weighed the two wooden stands. In my opinion, the total weight would still have to be deducted.
Loved the music to go along with the mystery and suspense! I suspect it was “inspector approved” 😉
Great episode! Kept my fingers crossed the whole time, but I knew it would turn out okay because the episode didn’t begin with an obituary. I appreciate the care and precision used to obtain an accurate and dependable weight estimate.
Another very interesting, informative and educational video. I like that you are so humble with all your skills and boating knowledge.
Rest up, make sure you are hydrated, and be ready for the most challenging athletic event of your life. Parenting a new born is like Seal training with the sleep deprivation and that little bugger will have you on the ropes time and again. Enjoy the ride!
Just….. wow!!!!!
Great episode! Stay safe and keep rolling! More progress! 👍👍nice job Duracell team on getting this crucial step done! 👍👍
Really very interesting and instructive video AND a sound lesson in being careful, methodical and taking all the time needed to be sure of accuracy. Thank you - I watch all the videos and never fail to learn much - and I don’t have a boat despite living near a plethora of marinas….. too old now! Hope all goes well with your impending family increase! Phil, Suffolk ( which is in England !🫢) U.K. 🇬🇧
A great explanation of a complicated topic. Looking forward to seeing the finished project!
I held my breath watching you position the boat for weighing. I can only imagine what was going through your mind while you were doing it.
Oo man I know where I went wrong now, I forgot to weigh the litter pan. 😅
Great video Matt , you guys are coming along.... 👍. Fyi, my 30ft Islander is 9400lbs with the 3700 keel.
I was going to guess 11,200lbs! I might have won the prize if I did....... Great explanation of CG and righting moment. I had a basic understanding but that was really helpful.
Love it 😍
Hi guys, I know there’s a lot of sick bastards out there in the world that something will go wrong and I’m so glad you are doing this so’s safely I know you wouldn’t take any risk. Keep up the good work. Really love and appreciate you guys for your videos from Australia.
Amazing explanation, Thanks
Super cool stuff!
Wow, just wow. Great explanation.
Awesome explanations. Glad it all went safely
Awesome video, Matt ! I found it extremely interesting and informative.
Very interesting, you did a great presentation. I expected nothing less.
🎉 nice matt
Nice Matt 💪🏼
10k is awfully small for a blue water boat. No wonder that boat set a record for circumnavigating the world. Really nice looking lines
Congratulations on this very important achievement to move forward...Greetings from the extreme south of South America
Really great job explaining what you are learning! Not a easy task 🔥
Thanks
This was a harrowing exercise, it was clear just how nervous you were, well that is done and you have the real useful info you need now.
Are you going to go into the keel design at some point, I have seen the NZ entry for the Americas cup with their at that time revolutionary keel design that was the secret that helped them with the cup.
Very informative. Explainations were clear(at least to me). Thanks for the video.👍👍👍😁
Any day now!?!? Are you all ready for this life changing event? Of course you are. Even I understood your lecture on stability. Thanks for the video.
we hope so!
Yup. Nice job.
I commend you! This has been a long journey - God Bless.
Nice job Steverson!
I was nervous too!
I was not afraid and I am hysterical one. :D
Amazing very nice
Very well done mate….it’s amazing how you do most of all this yourself. It’s been my experience that there a force of nature where boats ALWAYS accumulate weight over the years….for many reasons…..some of which we know about and some we don’t 😉
Matt, Good job. Very interesting.
If I understood correctly, you didn't have an accurate weight before you started the project. If so, I'd say a pretty good result.
just Rodger Martin's estimate.
Nice to see the chains on the jack stands..
Hey y'all. Enough detail to where I know more now than i did twenty minutes ago. I can't re-explain it to someone else but I can better understand the details y'all must work with. And here I thought you could just refit Duracell however you wanted...i'm a fool. So glad you schooled me up.
Hi Matt, I Love all your videos and admire your efforts. I have a liile comment... Fitting the boat to be a cruising boat although, it definitely increases its weight, it most probably reduces its righting moment since that weight is mostly being installed higher up while keeping the center of boyancy where it originaly was since the shape and volume of the boat remain the same. So the center of mass moves higher for the same center of boyancy. So i would think that it actually makes the boat more difficult to right once it capsizes. Or maybe i didn't get your point correctly. It must be a torture having so many thousands smart asses like me picking on your every word😂.
Before I ever found your channel I got into an argument on reddit about the risk of converting a racing boat to a cruising boat in general with respect to your project in particular.
My concern was not just with the mast but with everything from bulkheads to chainplates to hull scantlings. On a race boat it's all designed to very tight margins with respect to the maximum anticipated load (which admittedly for a boat like Duracell is a substantial load with the offshore southern ocean pedigree). A lot of people try and then find that their boat breaks in multiple places just because there is too much righting arm from all the canned goods and creature comforts on board. Then I found what Evan wrote about it on Sailing Anarchy and my fears were allayed. Seeing that the keel was being shortened and that originally designed internal ballast tanks were being reduced in size made the project seem much more advisable.
I think the mast is shorter and therefore less sail area exposed to the wind, so there is an inherent safety factor built in. Don’t forget this project is under the watchful eye of a naval architect too. The internal ballast tanks have already been largely cut out and partly reused with a lower volume.
I can imagine racing boats tend to find the borders of a safe sail area and even go over it a little… Decrease the sail area (smaller mast) and it should be fine for a cruising boat and still be fast.
@@SunshineSailing84 That helps, but it can leave you with a false sense of security. Usually what teaches people to reef is the excessive heeling. If you convert a race boat to a cruising boat without decreasing the righting moment even if you shorten the mast it's not going to heel over until it is past the point of being overcanvased and when it is overcanvased it'll be unsafe. Shortening the mast just has that dangerous situation where the failure happens before the warning kick in at say 17 knots instead of 15 knots.
I think not being a naval architect made for a much more understandable explanation and you did great!
Cool
Last time I mentioned rotating machinery regarding safety. This week you crawl under nearly 6 tons of boat supported
on the edges of cheap wood flooring !
Since your luck is holding out so well, maybe buy a lottery ticket. At least many viewers, including me, now know how critical C of G is.
Including fore and aft for trim, I had never considered that.
Off on a tangent here! I had a tipper lorry years ago. One day someone set fire to the Quarry weighbridge, so the girl in the office was given a handheld radio! the shovel had weigh cells. She asked how much he had loaded me with? 20 tonnes came the reply. Oh she said, your only allowed to carry 19.9 tonnes go and tip some off . Upon returning for my ticket she asked the shovel driver how she would know how heavy I was? I heard him say! use your imagination. lol
Very well done!! Not sure if you held your breathe at all, but I did.
We put a keel designed by Henry (Harry) Scheel at Morris Yachts on Mount Desert Island off the coast of Maine. Very stable even with our club racing boats with tall rigs.
Interesting, scary process. Well done😅
Hey Matt just grab that little door handle you have near the bottom of your boat support and just pick it up yourself you don't need a jack LOL
Squinty pirate Matt is my favorite explainer.
Good afternoon. Tell me, in which series do you show design calculations for the yacht? Or maybe make a separate series with details on all the necessary calculations? This would be very useful for us viewers and very interesting.
sprinkled throughout episodes.
09:01, I cannot stop laughing! 🙂
It is actually a crazy step, but it shows your commitment!
It would be interesting to keep the measurement of where you weighed the boat (basically where the cradles were placed on the hull).
Now I have two suggestions (one a bit more crazy then the other).
Have you thought of designing it as a canard keel?
Or, crazier: A pair of bilge keel?
Cheers,
a.
What's a canard keel, foil wings attached to the bulb?
@@John-Nada A canard keel is where the leading edge of the keel is attached to the hull and the bottom of the keel but leaves a space between it and the rest of the keel. Due to the fairing of the leading edge the water flows and re-attach itself to the rest of the keel further aft. This allow the "missing led" to be attached at the bottom of the keel.
I am a big fan of canard keels.
The keel would be a great mailbox post
Bon travail👍
Just like moi, it is surprising how many people missed the mark by a whole lot, there were a lot of guesses in the 16 to 18k lbs, some were wildly off the mark with 37k, or 1,380 lbs. (Closer to the dinghy weight) and only a couple guessed within the 12k. No-one, that I saw scrolling way down put the number in the 11,000 range. It would be funny to unvail who came closest to the 11,300 lbs. number.
Very cool that a 60' boat hull is only 11k lbs. It'll be interesting to speculate what the weight will be all up.
As a Structural engineer.... I am here to glare at haters in the comments. The world is a boring place without people willing to try to learn, unafraid to admit they are but yet an amateurs. My regards to the inspector craft recognises craft. :D
After my guess last week, I reaised I was adding in the keel. I should have edited it, but I wanted to see how far off I was.
I’m not a naval architect but I did take a course on stability in University (because the class went to a conference in Florida😂) looks good to me!
Well done, Matt.
It seems to my untrained eye that there is quite a difference in the weight of the starboard side and the port side, for the aft craddle. Is this normal? Is this expected? I would have thought that it should be more evenly distributed; i.e. the CG is on the centerline of the boat...