Ben752

After years of dust and battle damage she was put up in dry dock; cleaned layers of dust and battle damage repaired due to young growing girls. Then a brass plague added, new base to index a custom built glass case she now resides for years to come completely protected. The granddaughters now truly appreciate the work involved in building models having grown up watching me build various model subjects. In fact the younger one now builds Star Wars spaceships with LEGO blocks that are quite intricate.
Fair winds and following seas in her new home!

Hi Ben,
 
For you and anyone interested I can share the python source code. There are some comments written in the code file that can explain the order of things and the calculations done.
If you encounter difficulties or other unclear parts in the code you can always send me a personal mail.
This is the code file:
ship-plan-adjuster.py
 
best regards,
   Kris
 

Kris,
 
I shared a few things just to show some similar research but totally agree with your analysis.  
 
I was curious if you happen to have Mac version or even better a GitHub repo with the source?  I’ve encountered the same challenge and love your approach.

As an aside, I wrote a small a Python script that used scipy’s genetic algorithm to fit splines that output control points compatible with how Fusion 360 constructed knots.

Great work!
 

I have quite a few of the miniatures, I use the shoulder plane and block plane constantly.

My favorite vice is one of these https://www.cousinsuk.com/sku/details/vices-bench-vice-jaws/v9692
 
 

I have quite a few of the miniatures, I use the shoulder plane and block plane constantly.

My favorite vice is one of these https://www.cousinsuk.com/sku/details/vices-bench-vice-jaws/v9692
 
 

Just want to point out this is:
Awesome Computer Vision research  
The known references certainly assist dramatically.  I recall reading a paper about removing lense distortions by using a reference photo of a checkerboard, fitting the edges to make grid points and then fitting a transform function.  Seems like an adaptable solution. 

https://mzucker.github.io/2016/08/15/page-dewarping.html
https://arxiv.org/pdf/2007.09824.pdf
https://github.com/gwxie/Dewarping-Document-Image-By-Displacement-Flow-Estimation/blob/main/90_paper.pdf

I have quite a few of the miniatures, I use the shoulder plane and block plane constantly.

My favorite vice is one of these https://www.cousinsuk.com/sku/details/vices-bench-vice-jaws/v9692
 
 

I have quite a few of the miniatures, I use the shoulder plane and block plane constantly.

My favorite vice is one of these https://www.cousinsuk.com/sku/details/vices-bench-vice-jaws/v9692
 
 

I have quite a few of the miniatures, I use the shoulder plane and block plane constantly.

My favorite vice is one of these https://www.cousinsuk.com/sku/details/vices-bench-vice-jaws/v9692
 
 

After buying a few sets of cheap import files that really tended to incite frustration followed by anger, I decided to purchase some new files (post-hoc).
 
If if anyone is looking for upgrading files, I'm very happy with the following purchases.
 
http://www.ottofrei.com/Habilis-Vallorbe-Files-Set-of-5 - Extra Coarse 00
 
* These are $67 but work excellent as roughing files and have a nice balanced feel and are designed for use without a handle.  Basswood causes the files to not bite if too smooth it seems.  The 00 Habilis grab nicely on basswood and the extra weight seems to aide in the cut.  The 3-square works well in cutting slots, it fit horn timbers.
* I've been using them for roughing work on filler blocks.  These gave me some much needed tooling between a dremel and the cheapie diamond grid needle files, which turns out is something I desperately needed.
* Highly recommended.  A little pricey but given how much I use them now.
 

 
http://www.ottofrei.com/Glardon-Vallorbe-LA2483-Swiss-Made-Needle-File-Set-Of-Twelve-6-1-4-16-cm?custcol_of_xc_file_cut=1 - Course 0
 
* Very nice set of files.
* I haven't used these much yet (i've only had them for a week) but I suspect they will be used very often as I progress through the build (and take on more metalworking projects).
* $84-93
 
 
 

 
 

After buying a few sets of cheap import files that really tended to incite frustration followed by anger, I decided to purchase some new files (post-hoc).
 
If if anyone is looking for upgrading files, I'm very happy with the following purchases.
 
http://www.ottofrei.com/Habilis-Vallorbe-Files-Set-of-5 - Extra Coarse 00
 
* These are $67 but work excellent as roughing files and have a nice balanced feel and are designed for use without a handle.  Basswood causes the files to not bite if too smooth it seems.  The 00 Habilis grab nicely on basswood and the extra weight seems to aide in the cut.  The 3-square works well in cutting slots, it fit horn timbers.
* I've been using them for roughing work on filler blocks.  These gave me some much needed tooling between a dremel and the cheapie diamond grid needle files, which turns out is something I desperately needed.
* Highly recommended.  A little pricey but given how much I use them now.
 

 
http://www.ottofrei.com/Glardon-Vallorbe-LA2483-Swiss-Made-Needle-File-Set-Of-Twelve-6-1-4-16-cm?custcol_of_xc_file_cut=1 - Course 0
 
* Very nice set of files.
* I haven't used these much yet (i've only had them for a week) but I suspect they will be used very often as I progress through the build (and take on more metalworking projects).
* $84-93
 
 
 

 
 

I suspect most users of these are for fine metalworking however the coarser cuts are quite useful for wood and other soft materials such as plastic.  I've had better luck getting better quality tools from jeweler supply companies over hobby shops.
 
I think part of the wood/metal file distinction is that it seems many vendors often categorize rasps as files.  Lee Valley does sell a tool called a milled tooth file that look pretty interesting as they function more like a saw instead of an abrasive.
 
I could totally be wrong on this!

I hope you know how lucky you are.  With your supply you could plank a hull.  What a beautiful color that would be!!!    
Allan

Thought others might like to know that there has been a small bit of green and some dry boxwood as of late, presumably due to the ongoing infestation of the box tree moth caterpillars.
 
Regardless, I’ve ordered from several different sources listed below:

https://www.workshopheaven.com/wood-blanks/boxwood.html (limited stock)
https://www.ebay.co.uk/usr/hucrompto0 (in stock)
https://www.englishwoods.co.uk (out of stock)
 
The green logs, albeit many are twigs, I purchased as lot for £9 plus shipping.  So deals are out there, I found eBay saved searches indispensable.
 

Thought others might like to know that there has been a small bit of green and some dry boxwood as of late, presumably due to the ongoing infestation of the box tree moth caterpillars.
 
Regardless, I’ve ordered from several different sources listed below:

https://www.workshopheaven.com/wood-blanks/boxwood.html (limited stock)
https://www.ebay.co.uk/usr/hucrompto0 (in stock)
https://www.englishwoods.co.uk (out of stock)
 
The green logs, albeit many are twigs, I purchased as lot for £9 plus shipping.  So deals are out there, I found eBay saved searches indispensable.
 

Thought others might like to know that there has been a small bit of green and some dry boxwood as of late, presumably due to the ongoing infestation of the box tree moth caterpillars.
 
Regardless, I’ve ordered from several different sources listed below:

https://www.workshopheaven.com/wood-blanks/boxwood.html (limited stock)
https://www.ebay.co.uk/usr/hucrompto0 (in stock)
https://www.englishwoods.co.uk (out of stock)
 
The green logs, albeit many are twigs, I purchased as lot for £9 plus shipping.  So deals are out there, I found eBay saved searches indispensable.
 

Thought others might like to know that there has been a small bit of green and some dry boxwood as of late, presumably due to the ongoing infestation of the box tree moth caterpillars.
 
Regardless, I’ve ordered from several different sources listed below:

https://www.workshopheaven.com/wood-blanks/boxwood.html (limited stock)
https://www.ebay.co.uk/usr/hucrompto0 (in stock)
https://www.englishwoods.co.uk (out of stock)
 
The green logs, albeit many are twigs, I purchased as lot for £9 plus shipping.  So deals are out there, I found eBay saved searches indispensable.
 

Thought others might like to know that there has been a small bit of green and some dry boxwood as of late, presumably due to the ongoing infestation of the box tree moth caterpillars.
 
Regardless, I’ve ordered from several different sources listed below:

https://www.workshopheaven.com/wood-blanks/boxwood.html (limited stock)
https://www.ebay.co.uk/usr/hucrompto0 (in stock)
https://www.englishwoods.co.uk (out of stock)
 
The green logs, albeit many are twigs, I purchased as lot for £9 plus shipping.  So deals are out there, I found eBay saved searches indispensable.
 

Thought others might like to know that there has been a small bit of green and some dry boxwood as of late, presumably due to the ongoing infestation of the box tree moth caterpillars.
 
Regardless, I’ve ordered from several different sources listed below:

https://www.workshopheaven.com/wood-blanks/boxwood.html (limited stock)
https://www.ebay.co.uk/usr/hucrompto0 (in stock)
https://www.englishwoods.co.uk (out of stock)
 
The green logs, albeit many are twigs, I purchased as lot for £9 plus shipping.  So deals are out there, I found eBay saved searches indispensable.
 

Thought others might like to know that there has been a small bit of green and some dry boxwood as of late, presumably due to the ongoing infestation of the box tree moth caterpillars.
 
Regardless, I’ve ordered from several different sources listed below:

https://www.workshopheaven.com/wood-blanks/boxwood.html (limited stock)
https://www.ebay.co.uk/usr/hucrompto0 (in stock)
https://www.englishwoods.co.uk (out of stock)
 
The green logs, albeit many are twigs, I purchased as lot for £9 plus shipping.  So deals are out there, I found eBay saved searches indispensable.
 

Build log discussion here
 
 
and videos here.....
 
 
 
 

After a few transatlantic flights, I've managed to the roughly sketch body plan across the relevant planes set along station lines.  I ended up going back to the patch workspace instead of t-splines as the ability to edit edit and adjust far out-weights the smoothing ability.
 
I've ended up using projected points from the relevant half-breadth and sheer sketches combined with construction lines to establish bounds of the geometry.  Unfortunately it looks a little noisy in the screen capture.
 



 
I tried using splines but quickly became frustrated and went back to using arcs and tangent constraints.  Originally I used 4-5 arc segments for some but once I discovered the zebra analysis and repeatedly adjusted the curves for fairness, it became apparent that as few arcs as possible will result in improved fairness.
 
 

 
While still can be improved, if I keep continuing at this point i'll be spinning my wheels until I'm able to model other areas.  Which brings me to how to bridge the stern post, station 20 up through the wing transom.
 
I created construction planes using the sheer plan for the bottom of the wing transom, transom #1 - #4, and one in between the keel and the bottom of #4.
 

I then created sketches on these planes.  This adds some complexity as projections will be skewed when looking down towards the top of the keel.  I added the various reference points and intersected the stern post at each sketch.  However, a rough sketch of the filling transoms (?) profiles appear way off from the TFFM half breadth plans.
 
I've struggled making the 15" square at head of the stern post fit the rest of the plans.   TFFM states 1' 3" on pg. 41, pg. 64.    However, the plans seem to agree with about 12".   Additionally, the contract I have for the Hornet states:
 
"The stern post to be of good wound? oak tim of the best kind free from defects. sq. at head 12 1/2 (which is t run up to bolt in the Lua? deck beam)"
 
Which leads credence to the ~12" dimension. 
 
Does anyone have thoughts on regarding this?
 
This screen shot is taken top down which means the profile lines for the filling transoms are project per the angle of they're drawn on.  
 
 
 
 
 

 
 
 
 

Finally the new model workshop setup after my move to Edinburgh, Scotland.
 

There is a rather impressive hobby store called Wonderland Models just walking distance from my flat.  I found this squadron green putty a good substitute for the bondo spot putty.
 

I laid out the deck in a similar manner to xken, and used dark Titebond II along with some black grey to mimc the caulking.   I then used my  miniature veritas bench plane to remove the excess and borrowed a piece of glass from my furnished flat to create a flat surface to plane on.

Later I ghosted the plank ends using a mechanism pencil, a compass to create a pattern to trim the deck.
 

Last evening, I started laying out the plank belts using thread.
 

"a pile of patches" was actually pretty accurate in that it was constructed with several tangent arcs.  I had a similar experience of feeling it was just not right -- and that a different technique was needed.
 
Fusion 360 has curvature combs, draft analysis and curvature map analysis features.

Here is a curvature map analysis I ran, I haven't been able to to see much except when using the min/max settings and cranking the max values way up.  Hopefully this is a good thing (my prior hull showed more variance).
 
The CVs close together are a byproduct of using a mathematical fitting technique.  Fusion using fixed spacing for knot placement of curves.  While I'm not NURBS expert from the match side, my understanding is that if you are using uniform knots then you would need two CVs close together for it to generate the curves.  Now whether they should be split vertically like that, my guess is probably not.  I did run the fitting routine several times and it tended to favor placing them like that.
 
While i'm not totally satisfied with it, i'm trying to remind myself that I aught to start working on other areas and come back to it later.  When I intersected a plane with the hull the pattern for a frame seemed to match up well against other resources I have so hopefully that's a positive side.
 
 

Hi Ben
Your second approach to lofting the hull seems to be the right one. Now you have a single surface.
Before it looked like a "pile of patches". There`s no bad intentions in telling you that.
Does fusion 360 have analysis tools other than zebra striping? Can you apply gaussian curvature to the hull?
It shows the amount of curvature all over the surface in colours. It shows the direction of curvature, too.
Inward or outward.
Is there a tool called curvature graph in fusion? It`s a set of "needles", that point perpendicular to a curve or surface.
Or rectangular to an imaginary tangent at a given point. The length of the "needles" indicate the amount of curvature.
 
In your post #31 two control points are close to one another. At midships. One of the points is located inside the curve.
Does the curve bend inwards over there? Is there a hollow?
 
I`m curious, because I lofted hulls in Rhino. Finally I discarded those lofts. After having applied analysis tools, none of them satisfied me anymore.
My findings are not meant to disencourage you. Not at all. I`ll follow this thread.
 
Michael