JohnE

Santa María, es maravilloso! Muchas gracias por publicar este fantástico libro. It is truly a fantastic work.
 
You inspire modelers here in the US, as well. I downloaded a copy and will have it printed and bound. It goes into the library next to Boudriot, Vial du Clairbois, and Romero Landa/Julian de Retamosa.
 
Thank you again for so graciously sharing your investigations with the community.
 
John

Boy, oh boy, talk about CAD being useful in design. I provided Bava, one of our forum members, with a scaled preview set of plans, so he could make a 3D model. Little did I know how interesting and valuable that would be.
 
The plans contained some vestigial curves that were used as design aids but were not strictly part of the “official” plan lines. I simply plopped in something and used them as starting points in the iterative process of refining and reconciling body lines vs waterlines vs diagonals in the all-important but not at all well defined stern/buttock area. However, since they were only aids and weren’t part of the official plan lines, I neglected to reconcile them.
 
Doing a hull in 3D lets one slice and dice it along any one of a multitude of planes. Stick in an unreconciled vestigial curve and it just doesn’t compute. Bava found two of those and let me know he had issues with them.
 
I fixed one (not used, but visually informative) and deleted the other (not used) and things are now fair and the lines correspond to each other in all 3 orthogonal views. Woof!
 
Going to have to turn on the obsessive/compulsive part of the brain and get perfectionist over every plan line regardless of its usefulness or ‘official’ character. Everything must be “correct” in 3 space.
 
Thanks Bava. Keep them notes coming. Cornelie thanks you, too.
  John
 
btw: Христос Воскресе

Santa María, es maravilloso! Muchas gracias por publicar este fantástico libro. It is truly a fantastic work.
 
You inspire modelers here in the US, as well. I downloaded a copy and will have it printed and bound. It goes into the library next to Boudriot, Vial du Clairbois, and Romero Landa/Julian de Retamosa.
 
Thank you again for so graciously sharing your investigations with the community.
 
John

This is such a rich and unselfish forum for all aspects of this incredible pursuit. Thank you for your excellent response "MarkP"!

Hi Thistle;
 
The gun-port cills and lintels (also called cills,  actually:  upper cills)  were aligned with the curvature (sheer) of the deck,  maintaining a constant distance from the deck at the side of the vessel.  The sides of the ports are at right-angles to the keel,  parallel to the station lines (there are some exceptions,  but this is by far the general rule)
 
This means that the gun-ports are not square,  except for a few right amidships,  but are actually a parallelogram shape,  with the angles increasing towards the stern and bow.
 
To answer your question about guns moving:  when they were not being used the guns were stowed by raising the muzzle to its maximum and hauling the gun tight to the ship's side.  The muzzle then fitted into a curving recess cut into the back of the upper cill.  The gun-tackles were lashed up taut,  and an additional rope lashed around the muzzle and made fast to an eye-bolt in the side above the port.  
 
Hope this helps.
 
All the best,
 
Mark P

i know your like and ever if it's write in spanish it's an helpfull site for cthose who build the "nepo"
 
you inspirate a lot of modellers in france for your research!

Hello to everybody
My name is Alejandro Yañez, from Spain; I registered in your forum several years ago, into  “reading only category”, as I´m a frustrated modeler (when children came, wife decided there was no room at home for all, and so my unfinished Artesania Latina´s “San Juan Nepomuceno” lies stored in a closet waiting for a better time,...)
 
While making the model I decided to improve my model, and began to investigate Spanish XVIII century shipbuilding. As model building had to stop, I continued with my studies about the real “San Juan Nepomuceno” and Spanish shipbuilding of her age.
The result of all this is a “booklet” about 300 págs. I decided to share my investigations with modelers community in Spain (Foro de Modelismo Naval), and now with you, as I think Spanish shipbuilding is little known outside Spain. You can download it from this link:
 
 https://dl.dropboxusercontent.com/u/47335803/Nepomuceno_foro.pdf
 
The work is divided in two parts, first one is “San Juan Nepomuceno” history, and the second covers the study of the ship. This one is supported with drawings and photos of models exposed in “Museo Naval de Madrid” (Spanish Navy Museum)  Most photos in my work are from an incredible detailed model there exposed, this is not the real “San Juan Nepomuceno”  but a contemporary model from the french shipbuilder François Gautier (designer and  builder of Nepomuceno), and  so, very useful to study Gautier building system in Spain (1765-1784), also known as “French fashion” in opposition to the previous one developed by Jorge Juan, known as “British fashion”.
 
There is one “big problem” ....is it´s written in Spanish!
 
Hope you like it
 
Alejandro,
 

Mark P is a treasure isn't he. I see your avatar is the thistle class logo. I have sailed thistle and lightning class dinghys since I was 12; too long ago to even contemplate. Even now, in my late 60s, my biggest thrill is hopping on a dinghy and getting righteous.
 
Oh yes, as I too have discovered, these folks offer their best to any and all. Welcome to your new extended family.

Mark P is a treasure isn't he. I see your avatar is the thistle class logo. I have sailed thistle and lightning class dinghys since I was 12; too long ago to even contemplate. Even now, in my late 60s, my biggest thrill is hopping on a dinghy and getting righteous.
 
Oh yes, as I too have discovered, these folks offer their best to any and all. Welcome to your new extended family.

I'll add one more on the rudder, pal. I love it. Well done.
 
John

I'll add one more on the rudder, pal. I love it. Well done.
 
John

I'll add one more on the rudder, pal. I love it. Well done.
 
John

I'll add one more on the rudder, pal. I love it. Well done.
 
John

The 1740-1790 period was very interesting because this is when certain “modern” scientific principles took hold. Once again, the period texts give no rule, regulation, instruction, for a consistent, determinable, placement of the “load waterline”.  Once again, I believe this is a significant omission. The period extends from Pierre Morineau to Vial du Clairbois and includes Spain’s Romero Landa. Interestingly, at various times during the period, Spain was leading-edge in certain aspects of Naval Architecture and ship design.
 
Morineau followed the earlier paradigm and often put the load line coincident with height of breadth for his corvettes. In fregate and vaisseau designs, the ligne en charge was set at his “height of sill” definitions and the height of breadth fell where it may. Actually, it was the other way around, but “chicken or egg”. Ligne en charge “shall be no lower than a twelfth part (pouce par pied) of breadth below ligne du fort”. So again, LwL was subjective and depended on designer’s choice of section curvature. But LwL was not determinative.
 
The Spanish system, as late as 1790 (and maybe longer), was to use well known principles for buoyancy to do their designs. They launched the ship and made careful records of her “lightship” draught, fore and aft. They loaded her out (with moveable ballast) and made iterative sea trials to determine her best sailing trim. They made careful recordings of draft fore and aft under “best” conditions, and poof, a Load-Waterline.
 
Romero Landa, Reglamento de Maderas Necesarias para la Fábrica de los Baxeles del Rey,
Madrid, 1784 [Prof. Francisco Fernández-González, Escuela Técnica Superior de Ingenieros Navales, Madrid]
 
Even today, Lwl is a dynamic quantity. Every racing sailor knows that some boats like to go “butt-up” and some like “butt down”, and it all depends on aspect to the breeze. I would only ever give something a design “lightship” float mark for any of my designs, because the practical reality is so completely different.
 
John

That is beyond exquisite, Druxey. I have no words.
 
John

That is beyond exquisite, Druxey. I have no words.
 
John

I'll add one more on the rudder, pal. I love it. Well done.
 
John

That is beyond exquisite, Druxey. I have no words.
 
John

I'll add one more on the rudder, pal. I love it. Well done.
 
John

That is beyond exquisite, Druxey. I have no words.
 
John

I'll add one more on the rudder, pal. I love it. Well done.
 
John

I'll add one more on the rudder, pal. I love it. Well done.
 
John

I'll add one more on the rudder, pal. I love it. Well done.
 
John

Thank you again, all, for visiting this log and for your comments. 
 
A small update. The corner seats forward of the coach have been made and installed. These were some trouble, and I made three sets before I was satisfied. Running the moulding along the edges where the grain direction changed was difficult, as there was a tendency for tear-out.
 
Instead of wooden standards uniting the thwarts and sides, there are iron straps. On Prince Frederick's barge, the arm of the strap that runs across the thwart is inset flush to the thwart's surface. The side arm is bent as appropriate over the inner sides of the planking. This detail completes the structures in the rowing section.
 
While the model is invertible without risk, I shall be cleaning up the outer sides of the planking and softening the edges of the laps. It is also time to make and fit the gudgeons.

Well, you'll all have to wait a bit yet. 
 
The forward deck/platforms are made and fitted. The same card template strategy was used as for the footwaling and aft platforms. There are a few more details on the thwarts to take care of: iron strap standards that attach them to the side. Then there are small corner benches to make and fit just forward of the coach (cabin).