My Fathers Son

So I made an adjustment to the way the keelson is secured to the board, this should keep it straight. The three brackets this replaces were not holding the keelson very securely. I can't believe the price of balsa, it's ridiculous. So I will only block the stem and stern, and use accurately cut spacers to maintain the correct position and spacing of the bulkheads. I have been adding additional strips to the bulkheads, these help to keep the bulkhead square to the keelson and something to glue the spacers to. Just have to work out the correct position for the knighthead then can work on the stem blocking shape. Simon

The ply I used for the bulkheads is fine but but the keelson flexs like an agitated snake. I have looked into the price of balsa block and I just can't believe the price of it. So, with my thinking cap on I have decided to create a series of boxes with the upper level being in no more than three pieces. This means an extra level of ply level with the top of the keelson. To support this I am adding strengthener to each bulkhead. They will also increase the thickness of each bulkhead to help keep them at 90 degrees to the keelson. And as you can see, my assistant is ready to lend a paw. Simon

Sounds very interesting.

I will strip of the paper templates and I need to locate the places on the keelson for sockets for the masts. I am debating which is better, filing the space between each bulkhead with balsa or can I just add squares of ply. Stem and Stern will have to be balso filled so I have something to support the planking. I intend to add a lower deck the lengh of the boat which should add rigidity and then there will be the main deck which should add strength. The first planking will be 1/32" basswood and I will have a look at Cornwall Model Boats for the top planking. But that is a long way off just yet.

Thanks Keith, well it might be raining but my workshop is dry, well mostly. But at least I managed to cut out the main bulkheads. The penaltimate one, no 19, is sitting proud but I can adjust that when I get my next spare time. These were all cut by hand as that scrollsaw I bought can't cope with 3.6mm ply. Still not advanced my rigging on Cutty as my 4 legged fiends are too interested in what I do.

Its been a long time since I last posted but I have bit the bullet and have adjusted or cut out the majority of the bulkheads, bar three. So far they appear to be lining up as planned, pictures will follow. The main delay has been the fact that my workshop is no longer my armchair, it is outside and only partially enclosed, so had to wait for warmer weather.

Merry Christmas Keith, so glad to see you posting again.

I used a generic imge of Line drawings for a Captains Gig and constructed virtual model. I used the templates derived from yjese plans and the resultant phisical model has been installed on Cutty Sark. I faithfully created the frames from section 1A . I took a template from Elevayions 1B to give me the shape of the keel and the curvature of yje Gunwhales. However, creating the Plan from 1C shows an anomile whick can be clearly seen on the model as the lines should intersect the edges of the sections. This is relatively accurate on the stern half of the boat but not so forward of the central section. If i tried this with the vertical profiles from 1B Elevations, you would get a similar result. The drwings are cut and pasted from a single drawing. I have combined the documents to ensure that A, B and C are in the same proportion in each image but the result is always the same. I am happy with the boat built based on these drawings and have saved the formers so I can build a similar boat for Big T but this part of CAD work is a little frustrating. Also, I think I am reaching the limit of the complexity that either FreeCAD or my Laptop can work with. When creating complex documents there are noticable delays between mouse clicks and action on the screen plus when I try to keep my files in a structured way, half the screen blacks out when I am moving files. I needed to edit the Main Deck file as I am not happy that this does not extend out to the side of the vessel, but I cant edit the sketch. Nor will FreeCAD let me delete it and star again without affecting many other parts. I have hidden this document and am nearly finished creating a new one but this just exagerates the problems with a slow system. My laptop is not that old but I suspect that the built in graphics card is reaching the limits of its capabilities. Bah humbug. Simon

Made a little progress on refining the Bulkheads. The lower deck is complete but as the support for the top deck was limited to the edges, I did not think this would support the main deck. I have constructed the cross beams that sit on the Bulkheads and am desiging supports that run fore and aft so there is suppory for hatchways and Deck. I will also make vertical supports much the same way that the real thing. I will partially plank the lower deck so the covers for the main hatch can be removable Based on the work so far, the boat will look something like this. Simon

I have now finished working on the Lower Deck. If you compare this yo earlier images, you will see it is a lot more accurate towards the stern. The edges of the deck are not curved lines, they are short straight lines. This is because FreeCAD v 20 would not let you cut into a complex curve. V21 will and that is the version I am working in now but it was too late to go back to the start of this deck. This will be corrected at the time the Bulkheads are installed and faired. Next to tackle is the Main Deck as I have changed Bulkheads so I need to do the same to that deck as I have the Lower Deck. Simon

I have finished adjusting the Bulkheads for now and assembled it looks like this. However, I now have to create the locator cut outs to lock in the bulkheads square to the keel. This is a time consuming task and has a tendancy to break drawing so the 3D image will not redraw it self. 1 down, 18 more to go.

Having taken a look at the first few Bulkheads I am a bit concerned that the Lower Deck, whose main purpose is to create rigidity laterally will be too narrow at the crossings with the Bulkheads. But if I treat it the same as the Main Deck, then there will be insufficient support for that deck. And to cap it all, two of the three masts will be installed at or very near the junction of the lower deck and the bulkhead. So having put my thinking cap on, I have started adjusting the designs of the bulkheads so that a much wider lower deck can be fitted to stabilize the lateral strength of the hull. I can then make support beams that will install to support the main deck and again for the Fore and Aft upper decks. These will be laminated planks rate=her than plywood as they will take the curve easier. With the lower deck installed it will look something like this. I can then make Central Virtical supports and horizontal supports between them that will lock in the location of the Masts and support the Main Deck. There is going to be a lot of trial and error with this project as I have not actually built anything I have drawn in FreeCAD. Simon

After all this time, I have started cutting out the false keel and bulkheads for Thermopylae. This is courtesy of my new addition to my tool box and my temporary workshop in the back garden. It is second hand and the sander attachment was missing but it does cut 3.5mm ply quite nicely. I did have to get the replacement 4" blades from ebay-usa.

Well, that's the seats installed and the paint is as far as I go with this. Any brass work I do is going to be out of scale

So a little progress, still have the seats to install and some brass work to sort out. The gunwhales will be painted black. I am liking the proportions much more than previous attempts.