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woodrat

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  1. woodrat
    Summary of the Construction of the Hull On a building board with the plan of the ship glued, the keel was erected. Stem and stern posts were scarfed onto the keel. At this stage the shape of the master frame was determined by geometric technique of the manuscript Libro de Navigar. The master frame is fixed to the keel A special jig was made to allow assemblages of frames with different amounts of floor narrowing Tail-frames and every fifth frame attached to the keel. Intermediate frames are inserted to complete the main hull framing. Ribbands between the hull, stem and sternposts are used to fashion the bow and stern frames. Internal stringers and deck clamps are installed and longitudinal wales. This completes summary of the framing of the hull The Quarter Rudders Mediterranean vessels of the 13th century followed the ancient practice of having two rudders on each of the vessel’s quarters. The shape of these rudders is well known from contemporary pictures and recent discoveries in the Black Sea and elsewhere have confirmed the accuracy of these pictures. In essence, the quarter rudders need to have a mechanism to allow raising and lowering of the rudder. For instance, when heeled over under sail it was a common practice to raise the weather rudder and to steer by the lee rudder. A tiller was slotted into the upper end of the rudder. In addition, because there is considerable lateral force on the rudder, this must be resisted. In order to allow raising and lowering and resist lateral force, a system of curved rudder guides was built into the quarter of the ship and rigging designed to achieve this. The rigging is shown diagrammatically and the rudder guides as constructed on the model:: The rudder in raised position: The timoneer’s position is in front of the sterncastle The Deck furniture The Pumps These ships were probably fitted with log pumps. So called because the longitudinal element was made from a single log hollowed out by large augers . The pump mechanism was and expanding leather cone lifted by hand and predating chain pumps by centuries. This example was found in the Newport ship These are the pumps in the model The Windlass The use of simple windlasses is well attested but probably not capstans. I doubt that pawls were installed at this early stage. Masting and Rigging of the Round Ship will be summarised in the next post
  2. woodrat
    Reconstruction of a Venetian round ship of the 13th century Summary Richard J Beaver During the mediaeval period, Venice was a trading hub which dominated the Mediterranean and, despite numerous battles with its rivals Genoa and Pisa, Venice traded widely through the Mediterranean basin, up into the Black Sea and even sent trading vessels into the Atlantic as far as Flanders and the British Isles. At the period we are dealing with most of its trade was conveyed in either merchant long-range galleys (long ships) for longer distances or, for shorter hops, the round ship. It is this latter vessel that I wish to represent with a 1/32 scale model, built, as well as can be ascertained from the limited evidence, according to the original techniques used by Venetian shipwrights. Evidence was derived from rare manuscripts, contemporary paintings and illustrations and from the few wrecks of these ships that have been found. The craft of the ship-builder was secret and passed on to family or trusted individuals. Woe betide anyone who stole or revealed the secrets of this craft! No plans were drawn up. The constructions and measurements were made using geometrical and arithmetic formulae. These were transferred to templates which were often no more than dozens of marked sticks which were stored in case a further vessel was required. For instance, the distance from the top of the bulwark to the main wale would be one marked stick and the width of a deck beam would be another. The Round Ship or Nave Tonda was built skeleton-first and carvel-planked. It was lateen rigged on one or two pole masts. The stem and stern posts were drawn using simple Euclidean geometry and attached to the keel by simple scarfs. The keel lengths, beam width and depth of hold were also established using geometric techniques adjusted according to the owners special requirements. Each frame of the “skeleton” was modelled on a “Master-Frame” and consisted of a flat floor timber, two futtocks and two top-timbers fastened with iron bolts. No trenails were used in the construction. Having established the length of the vessel, the number of needed frames was calculated. Having determined how much the frames would narrow fore and aft, a geometric technique such as the “Mezza Luna” (there were others) was used to produce a smooth narrowing between the Master Frame and the two Tail-Frames (the last frames with a true floor, one at the fore and one aft). Each frame was then constructed with progressive narrowing of the floor. Every fifth frame was bolted to the keel and trued up. At this point, the frames were connected by longitudinal ribbands. The remaining intermediate frames were then installed. Ribbands were extended to the stem and stern posts. By direct measurement the bow and stern framing was constructed. After completion of framing, planking proceeded (by the Guild of Caulkers) using carvel planking, well caulked. External wales, internal longitudinal stringers, keelson and ceiling were installed. Lastly, deck beams were installed. In order to construct the model, I used the framing plans of the Contarina 1 shipwreck discovered in 1898 and fully measured. The overall dimensions were those given in a contemporary manuscript by Michael of Rhodes which has been fully published and translated. Lastly the superstructure was based on a painting by Veneziano in the St Mark’s Basilica ( the Pala d’oro). Summary of theConstruction of the model to follow in next post
  3. woodrat
    I stand corrected.😷 But Damme if can find any heraldic gryphon with a tusk!
  4. woodrat
    It certainly is, Steven. With a large gryphon landing pad on the sterncastle. But I thought it was the Roc that carried away elephants. and dropped rocks on ships I do not think that gryphons (griffins is equally incorrect) have the strength to lift elephants and I quote as my source: "in size and strength they resemble lions, but having this advantage over them that they have wings, they will attack them, and they get the better of elephants and of dragons. But they have no great power of flying, not more than have birds of short flight; for they are not winged as is proper with birds, but the palms of their feet are webbed with red membranes, such that they are able to revolve them, and make a flight and fight in the air; and the tiger alone is beyond their powers of attack, because in swiftness it rivals the winds." Flavius Philostratus, The Life of Apollonius of Tyana, translated by F. C. Conybeare, volume I, book III.XLVIII., 1921, p. 333. And if Tenniel is to be believed, they are much too genteel. Cheers, Dick
  5. woodrat
    To avoid cluttering Stevens log I have made some speculations on beams and decks in my hulc log Dick
  6. woodrat
    Until we find and excavate a nef with its upper works preserved enough to directly observe, any reconstruction is frumious. For my two bobs worth (i.e. two shillings worth, i.e. not worth much), however, I observe from the seals that many of these vessels have 3 through beams and the middle of which is forward of the mast where most force would be applied. The other two are forward and aft of this and are obviously meant to take a lot of strain. Indeed, the Sandwich seal shows the boat stored between the middle and aft beam. This suggests to my congested brain that there is a foredeck and and an aft deck supported on the fore and aft beams respectively. This would leave a large storage area between the fore and aft throughbeams which could be planked over, support a main hatch or left open ( for instance to transport horses and griffons). If left open (to allow griffons to see over the side as they have long necks) gangways may be needed to allow crew to go backwards and forwards and avoid griffons. I have attempted to show this in my spurious imagined hulc . I have also joined planks together and made them into removable platforms which sit between the rabbets of my cross beams. This would simplify access to space under decks. Cheers Dick
  7. woodrat
    I tend to agree, although many wouldn't. I made the same decision for the spurious hulc. The hulls were often blackened by pitch or other resins so nail heads would not show up well. When I was a lad and doing plastic aeroplane kits they often put in every rivet at 1:72 scale and all the dots made the plane look like it had smallpox. Later the kit tended not to have them. Looking grand, Steven. Dick
  8. woodrat
    There was insufficient freeboard so I have add a strake to correct this. The stern and forecastles are complete. They will be rigidly attached and some wash strakes applied. Cheers Dick
  9. woodrat
    I'm not sure this helps. The Nydam Ship from the western Baltic has been dated to circa 320 CE. If I am interpreting the photos well the clinker overlap seems to be maintained to the rabbet. So the use of gains probably postdates this The Gokstad faering uses a different method again. So they were obviously experimenting Dick
  10. woodrat
    Thank you for all the likes. Nearing completion of the hull and castles. Quite a few seals show bowsprits. These are not in the centre but offset to one side . This will allow unobstructed access to the stem for the forestay. The bowsprit is mainly for leading the bowlines to the mainsail. Staysails and jibs weren't used to my knowledge. The bowsprit necessitates some imaginative framing in the forecastle and is why I have left decking till the very last. Note the scuttle allowing ladder access to the castle from the foredeck. This ladder would be pulled up if the waist were boarded. Cheers Dick
  11. woodrat
    The castles prior to decoration. the sterncastle the forecastle castle decking and access scuttles to be added Cheers Dick
  12. woodrat
    Cometh the Banana Boat. Thanks Steven and I look forward to your "nef" Dick
  13. woodrat
    The following shows my interpretation of the possible framing of the fore and after castles. I believe that these should be strongly but lightly constructed as they would have to suffer the buffets of the sea as well as piratical assault while not making the vessel top heavy. Some models show somewhat flimsy castles. Cheers Dick
  14. woodrat
    Not a problem, Kevin. Welcome down the rabbit-hole. If you were to read the first few pages, you would understand that this ship comes from a somewhat Dodgsonian parallel universe. Nonetheless there is somewhat spurious evidence that such a ship (which we have called a hulc for lack of better names) may have existed and shipped cargo between England and the low countries in the early mediaeval period. We lack a wreck which could conceivably resemble this beast but, nil desperandum, what the heck! Here we have the quarter rudder, positioned on the "steerboard" side. The port or larboard side is reserved for the side of the wharf, where cargo is loaded. The rudder is closely modelled on the Vorsa rudder discovered in 1897 and probably a fairly new rudder which fell off because of withy failure (see previous posts). It is held against a wooden dome by the withy and the upper shaft is held against the hull by a strop of leather. Cheers Dick
  15. woodrat
    Yup. Better than a diagram. I built it. The hull fixture for the pivot needs to be solid. I carved it from a piece of fallen eucalyptus. The internal fixture for weaving the withy is a solid extra knee with oblique channels for the withy. I tried to avoid acute angles so as not to stress the withy. Having carefully drilled a 2mm. channel throught he internal and external fixtures, I passed a length of green tendril from a creeper in the garden which was easily able to be tied in a knot and remained strong. After I will have attached the rudder, the withy will be tensioned with a wedge. As this is an imaginary vessel, I allowed my imagination free rein. Cheers Dick
  16. woodrat
    The problem is how to tension the withy so that it holds the rudder to the side of the hull tight enough to resist the lateral pressure on the rudder and yet allow easy release of that tension so the rudder can be raised to avoid damage. Rope apparently stretches when wet and was found not to suit, so a withy was used. Hurdle fences are constructed with withies made of willow or hazel. Note the variation in thickness of the withies. Presumably if they are small diameter and green they can be bent around corners more readily. Anyone have experience "with" withies? Dick T
  17. woodrat
    Gangways are installed and some carpentry at the poop. Remember that there will be castles (one for the Red Queen and one for the White Queen. May they never meet!) Dick
  18. woodrat
    Gangways have been installed to allow easy access from the forecastle to the aft mechanisms and poop. I have a cunning plan to suggest how the rudder can be tensioned via a withy ( a narrow flexible willow branch). The withy was used to hold the rudder against the hull and resist the lateral forces acting to push the rudder away from the hull. Rope was not used because it would tend to stretch when wet whereas the withy would remain taut. Also the withy would need to be able to be loosened to allow raising of the rudder. cheers Dick
  19. woodrat
    No offence taken. This is one of my soapboxes that I have to get off my chest (among other mixed metaphors). Cheers Dick😀
  20. woodrat
    I have seen many more imaginary and fanciful "reconstructions" of famous ships that definitely existed, such as Santa Maria and the Golden Hind, but never in the strange manifestations offered by many kit manufacturers. I am at least honestly guessing at what may have been and at the end of the task will have an attractive vessel on the mantle-piece. As has been stated in this log, experimental archaeology is its own justification and can shine light on the past that shipwreck retrieval archaeology cannot always achieve. As an example of what experimental archaeology can achieve, I would point out your excellent reconstruction of the byzantine dromon and encourage others to take on such projects which are outside the mainstream of ship-modelling. Do we really need any more imaginary models of famous ships? Grumpily yours Woodrat
  21. woodrat
    The framing for the upper decks and hatches. The central area around the mast is for cargo and equine transport. Gangways will be installed. Looking aft from bow Looking forward from stern stern showing the lower halyard block Cheers Dick
  22. woodrat
    The lowest deck has been fitted. I have done this in removable panels. This would have been necessary to get access to the bilge for cleaning and repairs, especially if transporting horses. Cheers Dick
  23. woodrat
    Why,sometimes I've believed as many as six impossible things before breakfast.
  24. woodrat
    Framing complete and the hull is stained to imitate the likely colour of the beast. I hope you approve of the effect Cheers Dick
  25. woodrat
    Hull framing nears completion with all frames trenailed to shell. The decks will be next. I plan to have a central cargo area which could transport horses if required. The scandinavian influence is obvious but the barge-like shape of the hull would increase cargo carrying capacity. The reverse-clinker leads to an increased resistance to leeway which makes it less necessary to have a deep keel. The side rudder however will need to be wide and deep in the water to add more lateral resistance. Also note that the reverse clinker creates a channel in the midline beneath the keelson where water can pool. There is no need then for limber holes in the frames and less likelihood of rot. Evacuation of water is simply done either by bailing or a log pump. I think I will install the latter.There is plenty of room beneath the keelson for water to move side to side as well as end to end. As there seem to be so many advantages to reverse clinker, I would be surprised if the clever shipwrights of the time did not at least try it. Cheers Dick

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