What is a Table of Offsets and Lofting? Designing a boat.
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- Опубликовано: 29 июн 2024
- A full explanation of how a Table of Offsets is developed and used to loft a full size boat. Lofting is enlarging a boats plans to full size. It is an essential step in the process of building a boat. Boat Builder, Bob Emser provides a clear explanation of the process that has cofounded many boat builders, amateurs and professionals alike.
“If you’re going to make it, make it beautiful.”
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Хобби
never have i been more exited for a youtube video than seeing a 35min lofting vid on my for you page
I have looked at any number of drawings and I always ended up scratching my head. Thanks for clearing up a lot of my questions.
My Pleasure.
You’re going a long way to de-mystify the process of planning and lofting to me Bob.
Thankyou.
I love that you are the one to build the tender for Arabella. Two of my favorite channels coming together for something huge. I can't wait for this last year of building Arabella to come to the point of launch. It's one project I have watched from the start. And to see it completed will be sad as well as so extremely proud of the team. Thanks for joining them on this project.
After having seen the complete series of Acorn to Arabella, I now am following The Art of Boatbuilding. It's great and I really admire this contribution of Bob Emser and hij detailed explanations, I love it! I live in Holland near the sea, only 7 km's away, so there is always that wish to go there.
I'm also dyslexic and one thing you have on me is the ability to work with numbers. They are a foreign language to me. Can't wait for the build though.
WOW! It's like boat building 101 for dummies after your explanation of the lofting of Victoria the tender it's much more clearer on the seemingly complex process I almost feel like I could do it myself THANKS for the tutorial Bob just did something I've been wanting to do purchased a t-shirt and encourage others to do the same
Glad it helped!
I would love a set of plans for Victoria, I’ve always been into boat building but do not have the space to do it myself, would still love to have the plans either for the future or to just hang up as art. Thank you for your in-depth videos that really help to understand the whole process of building something so unique
Well explained Bob - You are getting "YOUR DUCKS IN A ROW"
Thanks for the clear and logical explanation of the proper way to build a boat. Getting your plans could be my first step in getting my ducks in a row!
Though I will never actually loft or built a boat I find your explanations have taken the mystery out of this process. Thank you, Sir
Glad to see you had your ducks in a row at 25:10.
Best explanation of lofting I have ever heard. Thanks and well done Bob 👏
I love that you "own" being dyslexic rather than being afraid of it. What a Man.
hi I am a retired engineer and i have enjoyed you content. technically and the construction of the boats. keep going
John C Bozzelli
Thanks John!
You just made everything so much more clear for me. I totally agree with Marshall Alwin. I have a few things left to do in our home and am currently building a small camper, but my ultimate goal is to build a small wooden boat someday, and your channel has helped me understand things so much better, and I’m steadily gaining confidence in attempting such a task. Thanks for all your information and expertise! ❤
Thanks Kevin,
I've been helping boat builder build their boats online for some time now. If you'd like more information here is a link.
www.boatbuildingbootcamp.com/
Cheers,
Bob
I have been enjoying your RUclips channel since season 1, and having grown up in Maquoketa, IA, it is encouraging to see such a skilled boatbuilder working in the Midwest. I haven't heard you say your typical sign-off line in a while, but I couldn't agree more, "If you make it, make it beautiful"
A POSITIVE comment. What's wrong with people that it has to be pointed out? He's not building your boat. What do you care? If you don't enjoy it, why are you watching it?? Victorias process will be every bit as beautiful as she'll turn out to be. Lofting made to look so easy. The teacher is the difference. Very well explained.
You being dyslexia you have good hand writing. I am dyslexia to my writing is horrible. I like watching you because you give me a lot of encouragement. I am 75 years old an school in 1953 was very hard just to get along.
Thank you France for the SI metric system
It's refreshing to see someone else in my age bracket that's also willing to admit to being number dyslexic. At the time I graduated from HS no one had ever heard of dyslexia. I was 20 when I figured out what my issue was with numbers and began finding ways to work around it. Now 50+ years later I routinely get 7 to 10 digit numbers 100% correct 95% of the time.😁 And yet, I still double check even 2-3 digit numbers I'm working with.😂
measure twice, cut once right
It’s really nice to see you get all your ducks in a row!
excellent explanation. It would be interesting if it had subtitles in Portuguese.
To quote Bevus and Butthead, “Your like a genius and stuff.” Nice to see Victoria coming along, and I’m sure it will be as close to perfect as possible. 😉
Today’s video was so satisfying. A touchstone to the past at the same time useful for any plans purchased today.
Once again, my coffee got cold while I was so focused watching.
Glad you enjoyed it!
Great series Bob, I was trying to keep up with your imperial measurements as you called them out, good fun, thanks for publishing 👌
Watching the Victoria build and getting very interested in building this project. I have been looking for a small strip build sailing dinghy and your instructions are fascinating to watch, patience is key. Thank you. Captain Dave Hickey owner of Patriot a 2002 Island Packet 420.
I really appreciate how simple and effective lofting is Watching you, and Steve previously, is an insight into how petite have built boats for hundreds of years.
I have always been a rc model boat builder and thought I understood these drawings. I must say you have made things so much clearer. I found your channel thru watching A2A. Love your channel and what you are doing for Arabella.
Thanks Joe
Thanks, it was the first time I understood how to read a table of offset. I live on the other side of the Atlantic and here the decimal system is applied. A half is written as 0.5, a quarter as 0.25 where you write 4 and 2 implicitly eighths. Perhaps a twelve-digit system would be better. Although it is hardly realistic to implement. Here you enter measurements in millimeters even for large structures such as houses, bridges or ships. Small and very small details in tenths, hundredths and thousandths of a millimeter, etc. 0.5 means five implied tenths, 0.25 twenty-five implied hundredths. But mainly it is with great pleasure I follow the development of both A to A and the dinghy in your workshop. You are all very skilled and committed.
Kare, Thank you for following along
Whether using metric or imperial they are both tick marks on a stick. Both offset tables would look the same just a different number.
Why did I use imperial? I really don't expect many viewer to design a boat and need to take off the measurement. However, watching it done does help to explain what an offset table is. As I said in the video, that I would be using the traditional notation so that if you purchase boat plans that needs to be lofted you'd understand what the notations meant.
Thanks for watching!
Cheers,
Bob
Thank you for your comprehensive answer. I have worked as an architect with houses and interiors here in Sweden but also been interested in boat design and made some constructions and built and renovated some sailboats. Later, I used CAD programs using splines to describe lines with curvature and created tables for these. However, I did not understand how tables of empirical measurements work with eighths until you clearly described them in your video. I have previously seen an empirical tithe system but it was difficult and easily led to error.
super cool channel i love your way of explaining things im learning a lot. and god to se you dit not let dyslexia hold you back in life thumbs up !
Lovely, patient explanations, and I particularly appreciate that you mention dyslexia without making a big deal about it, and even being reassuring that a reversal will simply show up in the work and be easily corrected. I work with dyslexic students, and this matter-of-fact attitude of "no disaster" is one of many important ingredients for progress.
Thanks Scobie,I appreciate your kind comment.
So glad you are building Victoria. Can't wait to see how she comes out.
Fantastic Bob… you’re a very good teacher. 🇨🇦
Thanks Bill!
Great video, clear, entertaining, & well recorded & edited. Essentially an enjoyable classroom experience. Makes me want to build my own boat. All your videos that I have seen are excellent. Thanks
Thanks Jim!
Bob, Really enjoyed and learned a lot about lofting … especially developing and applying the table of offsets. I guess you cold call this the hidden art of boat building.
Clear and concise explanation of the table of offsets used to loft Victoria. Another great video Bob. Thanks for sharing!
As I get older seems like I’m always learning something I forgot. Nice thing though it brings back memories
Ho Ann,
So glad you enjoyed the trip!
Bob
I have to laugh, I have done that way back when on auto body design. The same system is/was used on naval, aircraft and automobile design work. I also did it with CAD. In fact I did a boat design on CAD, Solidworks, last year for a friend. Somethings never change.
I would love to have the plans for Victoria Bob! She is becoming such a beautiful tender.
As always, I enjoy your excellent videos and expert skills. I am a sailer and have been a boater and woodworker virtually my entire long life, yet I often learn new things from you. I first became a fan of yours when you joined the Tally Ho rebuild, which was coincidently was when I also became an Arabella junky. I've seen all of your videos, and would like to thank you for your kind gift of building Victoria for Steve, and being a very good, eloquent teacher/mentor of boat building. You make the world a better, more beautiful place.
Thanks Carl!
Reminds me of what I did back in 2020 as I drew my boat 😀. Amazing technic !!!
Thumbs up!
My favourite thing is the woodworking involved; it amazes me how unique it is and because lives literally depend on it the quality of craftsmanship is at a whole different level. Wonderful to see.
Also there is something spiritual (like) building Victoria, having seen the original and the state of her, so this is a resurrection of sorts as Steve said (that's how I see it anyway). Boats are like that and especially wooden ones, they're not like a car but much more like a horse where they accompany the passengers on the trip and have a shared interest in arriving safely at their destination.
Well said my friend!
This was really informative and a great thing to learn. I really enjoyed a peak at how these go together!
I really enjoyed this video never knew that it wasn't always done on the floor. The battins is what gives the grace.
The tender is terrific
Awesome explanations Bob. Your videos are some of my favorites. The way you explain complicated things so that all of us laymen can understand is quite a gift. Thank you and I look forward to the next video. Victoria will be the Jewel in Arabellas Crown.
Well done Bob. Very well presented. This will be a valuable reference to any boat builder. Please keep posting these excellent videos. Ian
I have been following you through the Haven project and am now enjoying your Victoria project. I love your clear presentation of the many skills and crafts of boatbuilding.
Hi Holman,
Thank you so much!
Bob
Very Good, thank you Bob.
Yes! A set of plans!
Great to see the project unfold
great detail as always
Very well explained!
Great video, well done!
Bob, I appreciate your attention to detail... thank you, sir!
Fun and informative. Thank you.
Very useful info. Thanks a lot!!!
Really like watching your processes.
amzing work
Hey, Bob. I really love your channel and what you do.
Great explanation of the process
Well done Bob! Very clear explanation of a potentially complicated process. Looking forward to the next installment..
Thanks for the good video.
Good stuff Bob! Looks like a lot of fun. I’ve had questions about diagonals and this helps
Still fuzzy on lofting. I struggle in the aerospace industry with many types of aircraft print section views in my career. Funny how this old tech was used up till the 80’s and many aircraft in use today decades later were lofted.
Thank you for your videos. This encourages me to dig deeper to understand 😊
For many years I thought lofting was almost black magic and could not wrap my head around it till one day i sat down with a simple set of plans and actually drew them out like Bob showed and it all became clear to me. Think of it as putting points on a graph the X-Y lines are the Water lines and station lines
This approach is actually a lot better than using CAD. Mathematically speaking it will produce a more monotonic and fair curvature profile and is easier to control.
This boat building really is an ART....well done 😎
Thanks!
Great lofting class Bob. Your presentation is spot on and certainly takes the mystery out of the process. Just looking at the lines so far, this is going to be a sweet dinghy and as beautiful as Arabella. Thank you for sharing this part of the adventure.
I appreciate your best intention to educate us on this subject, Thank you so much.
Glad it was helpful!
Thnx Bob. Found it most helpful. I'm in the process of lofting currently and it provided a few tips.. Looking forward to the build..
Hi Bob, thanks so much for such a clear explanation of lofting, so pleased you're the one building Victoria. Looking forward to the next video
Glad you enjoyed it
Pretty interesting process indeed, Bob! 😃
Looking forward to the next steps!
Stay safe there with your family! 🖖😊
I remember some old time drywall installers calling out measurements that way to they guy making the cuts.
Interesting!
Absolutely fascinating and so easy to understand thank you.
Glad it was helpful!
Very informative and easy to understand. Thank You Bob for sharing your knowledge!
My Pleasure.
Thanks for watching!
Thank You for giving a comprehensive insight of planning and lofting a boat. I‘d be interested in a plan of Victoria. My only problem is, I am more familiar with the decimal system
Then my suggestion would be to take the table of off-sets and take each number and convert it to metric in a new working table for yourself, if you have a set of plans you wish to work from. Then work from your new table-of-[metric]-off-sets to layout your lofting floor. Or, if you have a metric scaled ruler like Bob's for this type of drafting, then measure out the boat plans and build your own table-of-off-sets, in metric, from the plan's drawings, like he did in imperial measure. You can do all milimeters, or m-cm-mm, your choice. What ever makes it work best for you. Of course, meters would rarely be used on a boat this small, but if it were a larger boat, then maybe.
good!
Great show, It really was informative to see the process from half hall model to life size layout.
Glad you enjoyed it!
When I first saw a set of off-sets I was totally confused as to what it all meant but once I started looking at it closer it became clearer and then one day I sat down and drew out a simple set and it dawned on me I was simply plotting points on a grid. It was an Ah ha moment. Your description was the clearest I have seen. Thank you. As for the folks who complain about you working on the floor I have to ask them why is the area where boat shops do the lofting called the "lofting floor"?
Thanks Tom!
Great explanations as always, would like a copy of the plans
Once again, well done Bob. Your videos are of course informative and entertaining, but most importantly they are efficient. Just like a table of offsets and the lofting process, it gives us just what is needed no more no less. You, me and probably most your viewers have some article of clothing with a body plan of a boat printed on it. Why? Because it’s magic! It’s a simple 2D representation of possibly the most beautiful 3D object one can imagine, a boat. Your videos are the same, simple 30 minute clips that reveal volumes of information. 2D to 3D at a glance. Magic!
Hi Matthew,
Thanks for your thoughtful comment. I couldn't agree more about the body plan, clearly, as I have a body plan as my logo. It is as you say "magic".
Thanks for watching. Hopefully there will be more magic to come!
heers,
Bob
Excellent! Clear and precise.
And yes, I would very much be interested in purchasing plans for Victoria.
Coming soon! I’ll announce how to get a set in the final episode of the series.
@@TheArtofBoatBuilding One other question if I may: being both an aviation and boat nut, I'm intruiged by what appear to be stylised sections of Spitfire wing hanging on your workshop wall.
What's the story behind them?
@@nickbarsby3378 They were a part of a sculpture exhibition I had in Chicago during the International Sculpture Conference. Here is a link: www.bobemser.com/Image.asp?ImageID=1629003&apid=1&gpid=1&ipid=1&AKey=5K235NVB
Thanks for your interest.
Bob
@@TheArtofBoatBuilding Really like those. Great engineering but you highlight the art and grace of the original design.
I like that you are demonstrating the pre cad design method for a product. I came here from AcorntoArabella and have enjoyed yor videos, thank you.
Hi Ronald,
Indeed It is so nice to see the boat drawing in full scale. I really give on a sense of the scale.
Glad you here!
Cheers,
Bob
It occurred to me that airplane designers of WW2 planes probably enlisted the help of boat builders like yourself to loft excellent designs without all the supercomputers of today.
Well done! Until now, to me, lofting was a dark art. In this video you removed the mystery in a very logical, easy to follow way. Many thanks.
Thank you! Cheers!
Bob
Comme d'habitude, je suis très impressionné par la qualité de vos vidéos.
merci beaucoup
Great video as always, and very interesting too.
P.S. Is that a B787 Silhouette in the window pane? I love it when engineering becomes an art form. Like the E'Type Jaguar, Super-marine Spitfire, and The Millau Viaduct in France, of course there are many more examples.
Yes, like high performance sailplanes; form following function at its most beautiful.
Nicely explained, Bob! As a retired architect and (very!) amateur boatbuilder, I have sometimes wished that working drawings for buildings would adopt the feet-inches-eigths convention used in tables of offsets to describe boats. As you've shown so well in this episode, it is clearer, simpler, and less prone to error than writing out fractions.
Having followed the Haven construction from the beginning, I admire your many skills and talents, and the great care you bring to your all your work. Being a perfectionist is a good thing - never doubt it!
Or we could go metric, like the rest of the planet😊.
@@banjopete Millimetres would be great for this! I am looking at buying boat plans from an US designer and would either need to buy imperial tapes, squares and rulers, or tranlate the measurements into mm. I'm in the UK where we use a confusing mix of metric and imperial but as a carpenter I use metric. It is much simpler to my mind
cool 🤙
+ , good job.
I’d be interested in a set of plans for Victoria. +1 for making those available to support the project.
Love all of your work. Beautifully designed and executed. Just thinking, isn't the view a "half-breadth," not "half-breath?"
You are correct! As a dyslexic pronouncing words is always a challenge especially when there is a similar word.
Thanks for watching!
cheers,
Bob
@@TheArtofBoatBuilding Thanks Bob, love your style and your work. Didn't actually hear you pronounce it wrong, it was in the Offset Table.
Hi Bob
In your next video, could you talk about the pros and cons of building a hull in the inverted or upright position? Please.
Thanks
Glenn
I will be sure to address it in a future video.
Thanks for watching!
Bob
I love your attention to details and explanations Mr. Emser. One question I have is how is the loaded water line determined so you can plot it on your line drawings?
Hi Art,
I determined the L.W.L. from the 2 boat plans I used as inspiration. It would be more appropriate for me to denote it as "designed waterline" D.W.L Thanks for the question. I'll change the notation.
Thanks for watching.
Cheers,
Bob
Hey Bob.
Love your channel - thanks for the effort you put into those videos. You gave me a lot of inspiration with your Haven built while I finished my last boat!
I don't usually comment on stuff like this and I might be wrong or you might have spotted it already, but your station 4 looks slightly different at the sheer end on your lofting floor than it looks on your scale drawings. It looks like there's quite a bit of tumblehome at this point, which then reduces again at stations 5 and 6. Maybe it's the perspective ... ?
Anyway - I'm looking forward to following your progress along my current built and I also can't wait to see your Haven on the water! Cheers, Daniel
I love using the floor for all kinds of work... such a great flat big working space, and you can sit anywhere you want., and when you're done just use a broom and make it clean.
I don't see why people have a problem with others doing it. Just make sure you have some soft pads or a sheepskin to protect your knees and ankles, and it makes it a lot more comfortable.
The great advantage of working on the floor is that you can use ducks to fix the batten. Lofting vertically would make that impossible, or you could use a metal base and magnets.
Am really enjoying your recent videos. Would be interested in a set of drawings for Victoria. Need a dingy/tender for our boat.
I would be interested in a set of plans. Could be a fun project to build some day for little boat on a lake.
Brilliant. Some say metric would be better, so might a plotter! But that isn't the point. This is a journey back in time to demonstrate the traditional methods used before the age of plastic and computers. I applaud the preservation of lost arts.
Thank you Cliff!
It does beg the question. Why not just use metric? Honest question
@@chilltake No reason, it's more efficient. But then we wouldn't have learnt how it was done in the era of wooden boat building. I can only speak for myself but it's the traditional and historical approach that appeals.
@@cliffingram270 sure. I can get behind the nostalgia of it :). Thanks for replying