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Richard Braithwaite

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    Sailing, Ship Modelling, Software Development

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  1. Continuing to add canopy sections. On the full size ship the sections were kept separate so as to minimise stress in the lightly built canopy as the ship flexed in a seaway. On the model I have left the outer rail continous so that alighment is maintained.
  2. First section of canopy with the planking completed, showing brass pins at base of inner stanchions which engage in brass ferrules in the deck beams and brass bolts which hold secure the outer edge. and here it is mounted on the model:
  3. Starting to plank the canopy today. Olympias's canopy was constructed from a number of sections so that the delicate structure would not be damaged by the hull girder stresses as the long thin ship flexed at sea. The sliding joint between each section is shown in the extract from John Coates Plan No 23 (Quarter Deck) below: The start of this joint is indicated by the arrow on the following picture of my model:
  4. Since this is intended as a model of "Olympias" rather than an updated attempt to model an Athenian Trireme, I shall stick to the Olympias Ram. As a parallel project, I am also working on a software simulation of the maneuvering of oared warships, which I am validating against the sea trials of Olympias. One of the original ideas was to use this model for testing to find some of the coefficients for the software simulation. Must admit that I got a bit carried away with the model. Rather more detail than would be strictly required for a tank test model... I (sort of) justified it to myself on t
  5. Yes, remains to be seen whether I can achieve the required level of accuracy. Placement of the thole pins in relation to the oar ports is critical to achieving the required length of stroke. The following photos show the approach I used: 1. A jig used for drilling the thole pin mounting blocks to ensure that the hole is in the right place and angle: 2. Some pins installed on their blocks together with a jig for installing at the correct angle in the boat: 3. Installing the pin in position using the jig: 4. The pin in position: 5. Finally,
  6. I've used lime pretty much throughout, mainly because the density is close to that of the pine used for the full scale reconstruction. Its quite a soft wood (compared to fruitwoods such as holly or pear), but that doesn't seem to have been too much of a problem and it has a very fine grain, which is nice..
  7. A plank on frame model of the colonial schooner Halifax based on Harrold Hann's book "The colonial Schooner" and drawings by Howard Chapelle from the Smithsonian Museum in Washington. The vessel was originally built as a trading schooner in the 18th centuary and was purchased by the British Navy for conversion into an armed topsail schooner in 1768. Drawings of the conversion are held in the National Maritime Museum in Greenwich. The model was largely constructed fro Ash with pear used for some of the fittings and boxwood for the carved work. The guns are machined from p
  8. This model of a French Naval Xebec Le Singe was built at a scale of 1/32" to the foot from Holly. The hull is solid up to the main deck and is planked with strips of holly shavings. The sails are made of tissue forned over carved wooden blocks to give then double curvature. The rigging is from blackened copper wire. Sea made from plasticene painted and varnished (and looks fine after 28 years!). The model is based on a model at the Musée national de la Marine in Paris. The whole model is only about 3 inches long.
  9. Before I embarked on this project I built a section model to see if I could fit machinery below the central walkway to operate the oars. This remains an option for this model which is why the canopy and internal hull structure is removable (see bolts in the above pics). The machinery is quite crude (I would aim to improve on that with the full model) but did demonstrate that independent control of port and starboard oars would be possible with machinery that would give an elliptical oar path with the right stroke length.
  10. There are 170 oars on Olympias. One of the purposes of the reconstruction was to demonstrate that that many oars could be operated effectively from a 37m long vessel... The oar system arrangement can be seen from the following extracts from John Coates Midship Section drawing:
  11. Several years ago (quite a few in fact...) I started building a 1:24 scale model of a reconstruction of an Athenian Trireme. The model is based on drawings produced by John Coats for building the full size reconstruction ("Olympias"). A number of trials were conducted with the ship in the 1980's, which have been published in a number of sources by the Trireme Trust. Well worth looking up. A fascinating example of experimental archaeology. I did have a blog running to record the model build (on this site I think?) but have not updated for a long time and I think it is no longer there. I ha
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