Episode 4 - Breaking Down The Lines (Boat Plans and Lofting)

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In this episode, we take a close look at the traditional lines drawing of a boat, explaining the terminology, and how the lines are generated from a 3D boat hull.

[@MickDouglas]

I am about to start making myself some model sailboats. I found your video explaining the lines on a set of plans is fantastic to help understand the shape of the hull. Brilliant work guys, thank you. Mick. Down under Australia.

[@4stringmanagmaildcom]

Little trivia: I worked for Boeing for 22 years, some of the time actually building my little bit of the 747. Boeing started as a boat builder and when they transitioned to airplanes they maintained the same dimension system used on the boats. So to this day, measuring from the front of the plane to tail are "stations", looking nose on from the center line to the right are "right buttock line", you can probably guess what the left side are called, (LBL). From the keel up (yes, Boeing airplanes have a keel beam) are "waterline". Enjoyed the video. That should help people understand how things are defined in space (3 axis) on a boat. Thanks!

[@neophyteboatwrights]

That's so awesome! I had no idea. but hey. basically sky boats.

[@4stringmanagmaildcom]

@@neophyteboatwrights You could say that. You just did. :-)

[@essoyyrivas18]

You guys are a "LIGHT OF HOPE" for those aspiring to build a sailboat and inspiring a lot of boat enthusiast (no experience at all in boat building) like me. ❤THANK YOU❤ for being a "GOOD TEACHER" to this complicated odd shapes and dimensions, very CLEAR VISUALS or FIGURES in understanding and teaching on how to build a boat. ❤ pardon me but no one did it except the two of U😉

[@neophyteboatwrights]

What wonderful feedback. Thanks so much. Will try to keep it coming!

[@steve95fxd1]

Great tutorial, the veil is beginning to lift. And great shirt, go Travels by Narrow Boat!

[@oliverwoodcraft9733]

Fantastic video, I have seen many lifetime Boatwrights (myself included) try and explain that and miss the mark. You knocked it out of the park.

[@robgosse9923]

So timely to find your video series. I plan to build a cat boat next year, and am going to school on this. I've built a couple deadrise skiffs, but they didn't require lofting. This is another level. Thanks

[@neophyteboatwrights]

Greatly appreciate your feedback! Thanks a million!

[@veysaldogus3457]

Thanks a lot! You explain clearly!

[@neophyteboatwrights]

Thanks!

[@NEVERGIVEUP-lm2xw]

Just wooww. such a simple way to explaining . If collages and schools teach this way I will never skip a class.

[@daveerickson1330]

Cutting up the hulls to show where the lines came from was an excellent idea,

[@tiogah]

God bless you for this. I have been looking for something like this for years.

[@bilalmohamed5409]

This is an outstanding presentation. Thank you very much guys. Wonderful job.

[@picbidervis]

I was lost in the terms trying to understand the thing as a new starter. Thank you very much.

[@nelsonattwood3821]

22 years ago, I had the opportunity to work for Philbrooks Boatyard in Sidney BC, and while there did a course in lofting. (to which your videos would have been a great asset). I remember being told that in the very old days, experienced boatbuilders-designers would bolt together 1/2" slabs of wood to represent the water lines. The boat shape was then carved out as a half-model, the slabs taken apart, and the waterlines traced out in scale. the slabs were glued back together and the model sawn apart to provide scale station lines, which were likewise traced out. from there, the boat lines were measured and scaled up to create the table of offsets. This may be a common boatbuilding myth, or it may be a true story, not sure. Anyways thanks for a great refresher explanation.

[@neophyteboatwrights]

Wow what a great piece of boatbuilding lore! Sounds implausible but not impossible

[@vitorsilveira3045]

Well done guys. Very good explanation...

[@BrunoWiebelt]

very good

[@richardsiegert2006]

Awesome Video, just what I needed at the moment! Thanks!

[@5lstrat537]

You guys are goooddd!

[@joelvanbeem]

Super clear explanation, thanks a lot!

[@Appaloosa67]

Excellent explanation Guys!

[@glengullickson6538]

Perfect!

[@JH-bd5bt]

Hey, thanks so much for making this video! I have had so much trouble trying to figure out how to understand the boat plans I bought and all the lingo associated. Definitely subscribing to your channel!

[@neophyteboatwrights]

Thanks! Appreciate the feedback

[@timothybrunemeyer608]

Excellent

[@kojomensah7474]

Thank you very much for this very vedio the step by step is very good who needs to go to university when you have people like you who is sharing

[@williamwright9681]

Brilliant guys!! Well done.

[@SailingMagicCarpet]

Awesome video! Well explained, great cinematography and nice music. Thanks guys Keep up the good work💪🏽 Aladino

[@seanclancy4938]

Came for the station lines, left with the jams of the ngoni coursing through my veins.

[@pjorgerod522]

Hello, amazing explanation. You really know how to turn things simple. I want to build a small sailing boat and now I am very interested in following your channel. So, thanks a lot and I will help in thumbs up and I already subscribed. Thinks it helps, Paul

[@karolusmagnus7786]

Nice way of drawing plans :)

[@frommyashesrisenrebornredemed]

Lets say i want to build female moulds and the table of offsets says that are the "inside skin" measurements and the designer calculated the plans with a 3inch ply construction. Does that mean that i have to draw the lines and then ad the 3 inch of the intended hull and then THAT would be were i should make the female moulds ?

[@neophyteboatwrights]

Sounds right to me. Doing planking thickness adjustments can be non-trivial in some cases. But assuming the original hull was planked say in a carvel fashion, then you should be able to smoothly extend the mould shape without issue. At least from where im sitting that makes sense. Would need more specifics to say for sure

[@jjSuper1]

So how can one generate the lines without carving and slicing a model into bits? Not that I'm opposed to doing just that.

[@neophyteboatwrights]

When designers are developing plans they generally loft them out at small scale (1/8th scale is common) in precisely the same way they are lofted at full scale.

[@mobydick6420]

diagonals - what are diagonals used for?

[@neophyteboatwrights]

So a diagonal is what you’d get if a waterline and a buttock line had a baby. It’s a cross section of the hull that is oblique to both the vertical and horizontal axes. Diagonals are useful bc they give you even more data (or constraints) on the hull shape. They interrelate waterline and buttock line data. This is especially useful in the case of a particularly shapely hull, where some curvature data may be missed by waterlines and buttock lines. In the end, the more constraints on the hull shape, the more accurate the lofting.

[@mobydick6420]

@@neophyteboatwrights thanks

[@TrevorPelletier]

Cool topographical animation! What did you use to make that?

[@neophyteboatwrights]

Trevor Pelletier thanks! we mainly use adobe software. So illustrator or photoshop for graphics and after effects and premiere for animation

[@johnterry8958]

Great video except for the music - icky music.

[@neophyteboatwrights]

different strokes, different folks. but I have tried to tame my music selection as I’ve matured as an editor. sorry it was such a turn off. can always turn it down and put your own soundtrack on it