Below gunwale wall angle.

[Megayossarian]

I’m currently away from my boat and building a fold down shelf. Can anyone tell me what the average angle is from the vertical of the boat sides from gunwale down. TIA.

[GUMPY]

Every boat will be different 😱

[TheBiscuits]

Usually between 0 and 45 degrees if that helps ...

[MtB]

6 minutes ago, GUMPY said:

Every boat will be different 😱

 

All the same, I think it is quite common for a 2m wide baseplate to be used. Once a 20mm sacrificial lip is incorporated, the 6ft 10in (2080mm) width at the top rubbing strake means that 120mm is the difference in width of the sides down at the base. 

 

Thats 60mm per side, and lets say the height from baseplate to widest part of the hull is 700mm. A bit of basic maths reveals the angle of each side is approx 95 degrees. 

 

 

[Jen-in-Wellies]

The angle also changes as you start to approach the bow, or stern. The only way to be sure is to cut each piece to fit the angle where it is going to go, using on-site measurements.

[nb Innisfree]

Every hull varies in dimensions, even same design by same builder, one day they might be built by robots and computers, millimetre identical, then they could be mass produced. Not before I die though I think. 

[ditchcrawler]

If you say who built your hull then someone here may have one by the same builder and can make a better guess.

[nb Innisfree]

One upon a time I was chatting to a diy fitter who had a "fantastic" idea to cut all his bulkheads in one go, "save time" he said, fortunately for him  someone  pointed out  the variations in a hull, the look on his face was classic. 

[MtB]

31 minutes ago, Jen-in-Wellies said:

The angle also changes as you start to approach the bow, or stern. The only way to be sure is to cut each piece to fit the angle where it is going to go, using on-site measurements.

 

Thats ok though; the OP asked specifically for the average angle.....

 

 

[TheBiscuits]

12 minutes ago, nb Innisfree said:

One upon a time I was chatting to a diy fitter who had a "fantastic" idea to cut all his bulkheads in one go, "save time" he said, fortunately for him  someone  pointed out  the variations in a hull, the look on his face was classic. 

 

I like standing next to bonfires on boatyards, and when the ripped out bulkheads are well alight I ask if the keen novice boat owner used them as templates for the new bulkheads.

 

I usually learn some new bad words about then ...

[David Mack]

On most modern narrowboats the widest part of the hull is at the top guard, the upper part tapers in a little from there to the gunwale and the lower part tapers down to a 2m wide baseplate. The internal lining may follow that shape, or more likely just run straight from under-gunwale to chine.

A few builders build 'Brumagem square' with vertical sides below the top guard down to a wider baseplate.

Most working boats were built with vertical sides between the upper and lower guards, but tapered in above and below to the gunwale and baseplate. Modern boats built as faithful replicas of working boats may do the same.

 

Only thing you can do is measure your boat.

[Tracy D'arth]

And some unmentionable boats are different each side............

[Alan de Enfield]

4 hours ago, Tracy D'arth said:

And some unmentionable boats are different each side............

 

Would they be the ones built in the city where car hub-caps had a habit of dissapearing ?

[Tracy D'arth]

1 minute ago, Alan de Enfield said:

 

Would they be the ones built in the city where car hub-caps had a habit of disappearing ?  Corrected that for you.

Yep.  Depends which side they were thrown over on to weld up first.