Mirabell61

Hello everyone
 
First of all, thank you for all your likes and views   
 
Now I would like to present a few thoughts i made about the RS14 as a functional R/C-model.
 
It is common knowledge and the manner of presentation is somewhat technical. If it should get so bored or everything is known, then please ignore these post.
 
Either way, for me these studies were helpful because they had a great influence on the choice of my design principle. It is my intension to make dimensions and geometry of the model same as the original. That means, to build a model able to sail without additional keel, etc. Further on the behavior how the model accelerates and turns has to be as close to the original as possible – in other words, it has to be slow.
 
Such behavior is difficult to obtain in a model scale because the decrease in the reduction let the surfaces shrink only by power of two, however all volumes by power of three. This means, if we compare the original (1:1) with a model in scale 1:15 the displacement decrease 15-times more than the sail area of the model! So, the ratio of sail area and displacement is many times worse than for the original. Why is it so important? As we know, these old boat designs were only able to carry their large sail areas with the help of massive displacement.
 
For a scale model, these ratio between sail area and displacement can affect super critical the sailing properties. At this point, i have therefore two questions to answer:
 
What factors are in this context?
 
1) Selection type of boat and sail plan.
2) Selection of scale.
3) Distribution of total model weight.
4) Arrangement of ballast portion.
 
What can i do to optimize these factors?
 
1) Selection type of boat and sail plan:
From the beginning the subject was given to me. Someway, i fell in love with “Stavanger“. It could be only this boat and fortunately this type of ship is suitable as a scale model. This due to a favorable ratio between big displacement and a relatively small sail area.
 
2) Selection of scale:
At this point, I had to check my intentions somewhat computationally. Experience has shown, that models with a specific sail area of a maximum ratio between 5 to 7 [sail area/displacement] in generally have sufficient stability and endurance at heeling, provided they have a high proportion of ballast. The greater the model (in the sense of model dimensions) is chosen the easier it will be to achieve this goal. I read about all this on various specific modelling web pages (http://www.minisail.ch, http://www.minisail-ev.de and more). So i've calculated ...
 
Sail area (scale 1:15):
47.6[dm2] = 107.2[m2] / 15^2
 
Displacement according to John Leather’s book (see post above):
8.0[dm3] = 27’000[kg] / 15^3 = apprx. 27[to] / 15^3
 
Displacement by calculation based on my CAD studies:
apprx. 7.0[dm3]
Why this difference of 1[dm3] (corresponds to 3’375[kg])? Already for a long time, i suppose when looking at photo documents, that “Stavanger“ lies lower in the water as shown on old plan documents. If I'm not wrong with my calculations, the difference of 1[dm3] causes a lift of the construction water line (CWL) from apprx. 6[mm] in scale 1:15 - what could quite agree ... (see below: overlay with line drawing).
 
So, i now have information about sail area and displacement in my chosen model scale. What is now the ratio called specific sail area (see above)? We know that a value of 5 to 7 want to be reached.
 
Specific sail area (scale 1:15):
47.6[dm2] / 8.0[dm3] = 5.96
 
For the moment it seems to be more realistic to calculate with the described displacement of 8[dm3]. Anyway i will reach the required range with a model scale of 1:15.
 
3) Distribution of total model weight:
My calculations for the intended keel design will result in about 5[kg] (Lead). The total weight is probably 8[kg], equal to the displacement. Further on experience has shown that a ballast portion of at least 60% of the total model weight is required to let those models sail well – so that looks good. My aim remains furthermore as much as possible to realize weight below the CWL and a light construction above the CWL.
 
In this context i decided for the following measures:
- Thin plywood frames (birch 4mm). Hence the decision to build the hull up-side-down. This way the thin frames are well fixed on the basic board.
- Dimension and the number of frames are model technically justified (see below).
- Ballast keel is maximized, wooden portion of the keels is minimized. the keel does not match to the original being this way – a R/C-model technical sacrifice that i have to take, but all less bad as the hull is painted (see below).
- maximum deep position for trim weights (see below).
- further i intend to optimize many other components above the CWL – of which i will report you later.
 
4) Arrangement of ballast portion:
The ballast distribution influences agility and thus the appearance of the model. As it is my intention, the longitudinal arrangement of the ballast will have a straight course effect. As a result, the boat will less unnatural wobble as this is the case by a central arrangement of ballast, also its turnaround will be slower and is more similar to the original.
 
Regards
Mike
 
Below:
- Overlay with line drawing
- Location of frames
- Original keel design
- Model keel design
- Areas for trim weights
 
 
 

Hello again
 
My studies and the beginning of the planning of “Stavanger“ go back to the year 2012. Again and again the work has been interrupteed by various reasons. But she was never out of my mind.
 
In June 2014, i stumbled on NRG'S MODEL SHIP WORLD. Originally because of the sensational images of 'Le Fleuron' by rekon54. Browseing the NRG-page i found the pilot by Michael Mott what inspired me and what newly motivated my work on “Stavanger“ – now i was ready to start with the build.
 
Mike
 
Below:
- start of the build
- wooden part of the keel
- stem
- stern
- raw frames
 
 

Thank you very much David,
I`m so happy that I have the time to follow my Hobby again after retirement, but still some time to go till she browses down the slipway
 
Nils
 
 
 
Your words are much appreciated Lee,
I`m sure your "Alert`s " rigging will be first class, telling by that super framing and joining work  so far.
For my behalf I ca`nt begin a rigging sequence without doing a hand-scetch first, in order to sort out what goes where. I seldom see this from fellow builders, but I`m sure they would do so as well. The scetch usualy bears the Information from several plan Sheets concentrated to the Need in the Moment (samples included)
 
Nils
 
 
 
 

Hello again
 
back to work in the workshop ...
 
In the next step, the frames are now completely drawn on the plywood and sawn with the scroll saw.
 
Also, the clamps are being prepared in 4mm birch plywood and and equal to
the frames they has a model-technical shape.
 
After that parts are assembled dry try. Keel, stem and stern are also unfinished and still in progress.
 
The frames get well fixed and adjusted with aluminum angle. Chipboard blocks are be used as a temporary stabilization.
 
Regards
Mike
 
Below:
- some little progress ...
 

Thank you very much David,
I`m so happy that I have the time to follow my Hobby again after retirement, but still some time to go till she browses down the slipway
 
Nils
 
 
 
Your words are much appreciated Lee,
I`m sure your "Alert`s " rigging will be first class, telling by that super framing and joining work  so far.
For my behalf I ca`nt begin a rigging sequence without doing a hand-scetch first, in order to sort out what goes where. I seldom see this from fellow builders, but I`m sure they would do so as well. The scetch usualy bears the Information from several plan Sheets concentrated to the Need in the Moment (samples included)
 
Nils
 
 
 
 

I think you call these the cross trees. They are about halfway done. I used some ebony scrap from a piece of leftover guitar binding to make them. The ends of the spreaders are grooved to take the deadeyes and futtocks for the topmast. This was the fiddliest work yet for my stubby fingers.
 
Thanks for reading.
 
Steve

Build log part 72
 
update on rigging the main course.......,
as I mentioned earlier I wanted to rig the square sails in braced mode, and starting with the main sail the angle of bracing is somewhat limited to fouling with shrouds, and main stay-sail
This is the maximum (sharp braced mode) I can get out of thje geometry for this squarerigger, with loostened weather truss, and set of sail controlling lines accordingly. Am quite pleased with the geometry so far. Am using more blocks than initially intended, but it provides better appeal for the rigging.
Shall probably rig the main topsail next
 
 
Nils
 

 
related to the pre-rigging of the yard with sail, this went quite well
 
 

 
leech- and buntlines attached but not belayed yet. Also the ratlines are not on yet, as long as I have to operate with the tweezers
 
 

 
here maximum bracing angle
 

 
 

 
most of the controling lines come down between main mast and gallow to the blocks on deck and then to the belaying rail
 
 
 

Fantastic work you are doing. I can not imagine I can do rigging and sail like you in the future.
 
Lee

Slowly you are finishing a labor of love and then out comes a fine bottle and a toast to the lady when completed.
David B

Just briliant !

Fantastic looking work Nils.  It's a sheer joy watching this ship come to life!
 
Cheers,

Nils , great job, as always    !
Mauro

Build log part 72
 
update on rigging the main course.......,
as I mentioned earlier I wanted to rig the square sails in braced mode, and starting with the main sail the angle of bracing is somewhat limited to fouling with shrouds, and main stay-sail
This is the maximum (sharp braced mode) I can get out of thje geometry for this squarerigger, with loostened weather truss, and set of sail controlling lines accordingly. Am quite pleased with the geometry so far. Am using more blocks than initially intended, but it provides better appeal for the rigging.
Shall probably rig the main topsail next
 
 
Nils
 

 
related to the pre-rigging of the yard with sail, this went quite well
 
 

 
leech- and buntlines attached but not belayed yet. Also the ratlines are not on yet, as long as I have to operate with the tweezers
 
 

 
here maximum bracing angle
 

 
 

 
most of the controling lines come down between main mast and gallow to the blocks on deck and then to the belaying rail
 
 
 

Build log part 72
 
update on rigging the main course.......,
as I mentioned earlier I wanted to rig the square sails in braced mode, and starting with the main sail the angle of bracing is somewhat limited to fouling with shrouds, and main stay-sail
This is the maximum (sharp braced mode) I can get out of thje geometry for this squarerigger, with loostened weather truss, and set of sail controlling lines accordingly. Am quite pleased with the geometry so far. Am using more blocks than initially intended, but it provides better appeal for the rigging.
Shall probably rig the main topsail next
 
 
Nils
 

 
related to the pre-rigging of the yard with sail, this went quite well
 
 

 
leech- and buntlines attached but not belayed yet. Also the ratlines are not on yet, as long as I have to operate with the tweezers
 
 

 
here maximum bracing angle
 

 
 

 
most of the controling lines come down between main mast and gallow to the blocks on deck and then to the belaying rail
 
 
 

Build log part 72
 
update on rigging the main course.......,
as I mentioned earlier I wanted to rig the square sails in braced mode, and starting with the main sail the angle of bracing is somewhat limited to fouling with shrouds, and main stay-sail
This is the maximum (sharp braced mode) I can get out of thje geometry for this squarerigger, with loostened weather truss, and set of sail controlling lines accordingly. Am quite pleased with the geometry so far. Am using more blocks than initially intended, but it provides better appeal for the rigging.
Shall probably rig the main topsail next
 
 
Nils
 

 
related to the pre-rigging of the yard with sail, this went quite well
 
 

 
leech- and buntlines attached but not belayed yet. Also the ratlines are not on yet, as long as I have to operate with the tweezers
 
 

 
here maximum bracing angle
 

 
 

 
most of the controling lines come down between main mast and gallow to the blocks on deck and then to the belaying rail
 
 
 

Build log part 72
 
update on rigging the main course.......,
as I mentioned earlier I wanted to rig the square sails in braced mode, and starting with the main sail the angle of bracing is somewhat limited to fouling with shrouds, and main stay-sail
This is the maximum (sharp braced mode) I can get out of thje geometry for this squarerigger, with loostened weather truss, and set of sail controlling lines accordingly. Am quite pleased with the geometry so far. Am using more blocks than initially intended, but it provides better appeal for the rigging.
Shall probably rig the main topsail next
 
 
Nils
 

 
related to the pre-rigging of the yard with sail, this went quite well
 
 

 
leech- and buntlines attached but not belayed yet. Also the ratlines are not on yet, as long as I have to operate with the tweezers
 
 

 
here maximum bracing angle
 

 
 

 
most of the controling lines come down between main mast and gallow to the blocks on deck and then to the belaying rail
 
 
 

Build log part 72
 
update on rigging the main course.......,
as I mentioned earlier I wanted to rig the square sails in braced mode, and starting with the main sail the angle of bracing is somewhat limited to fouling with shrouds, and main stay-sail
This is the maximum (sharp braced mode) I can get out of thje geometry for this squarerigger, with loostened weather truss, and set of sail controlling lines accordingly. Am quite pleased with the geometry so far. Am using more blocks than initially intended, but it provides better appeal for the rigging.
Shall probably rig the main topsail next
 
 
Nils
 

 
related to the pre-rigging of the yard with sail, this went quite well
 
 

 
leech- and buntlines attached but not belayed yet. Also the ratlines are not on yet, as long as I have to operate with the tweezers
 
 

 
here maximum bracing angle
 

 
 

 
most of the controling lines come down between main mast and gallow to the blocks on deck and then to the belaying rail
 
 
 

I start with the interior

purchased online a "scratch". eat a lot, but it is a very fine finish, so I made ​​aI have prepared a sand, egg-shaped, to sand curved areas. loop with velcro sanding.

with bike camera straps, and a stop serving sticks, grabbed the sleepers, faster than with cats and non-obtrusive to manipulate the boat

to keep the frames in place, I made ​​some "cats" with wire and rubber.

According to the drawing plane, on the edge of the frame, is the union between ligations, floors and genoles.
the cuaderna28, is marked as a teacher.
but it is between 29 and 30, which changes the meaning and what are the genoles face.
or at least that's what I did.
between frame 52 and 53, does the same, but face the floors.
I realized that later but just to see if I misread the plans.
a greeting
cabrapente

I keep mounting frames.

Got a little more done on it over the last couple days.  I got the bulwarks on her.  I need to pick up some balsa for filler blocks front and rear before planking.  I am going to mock up a lot of her before beginning the planking.  I am going to attempt something I have not done yet.  My goal is to light her.  Ages of Sail has a lighting kit for her sister ship, the Bohuslan, but not for the Mariefred.  The lower deck cabins will have their window glass frosted as the cabins are empty.  The 2 upper cabins and the wheel house have the proper fittings inside them, so their glass will remain clear.  No guarantee that the lighting will be done as I have never lit a model before.  Need to mock it all up so I can see where to run and hide the wires.  Then on to planking.

Ran into my first problems building the cabins.  Every pre-cut part from the thinner plywood is warped.  Fortunately, I have some large books.  I soaked each sheet and pressed them with books to straighten them out. 
 
Also, if you build this, watch out for the alignment tabs.  This has as more alignment tabs than a plastic model.  Unfortunately, nothing is in the instructions telling you that the tabs are staggered from one side of a cabin to the other, even if the parts have the same number.  I found this out after building most of the cabins.  Had to sand off a lot of the tabs.  Not a big deal as I will use the corresponding holes in the deck for alignment.  More of an annoyance. 
 
Even with the warped parts, the fit of this is incredible.  Due to all the alignment tabs, I will be going through a lot of wood putty so they do not show when everything is painted.
 
I have all built that needs to be for the lighting mock up.  The decks are painting.  Once I finish the pre-wiring for the lights, I can begin planking the hull.  The final picture is a test on the lighting.  You will see some bleed out as the cabin is not glued to either the upper or lower decks right now.