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woodrat

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  1. Thanks, Mark. In 1204 the blind Doge Dandolo, conspiring with his treacherous crusader partners, laid siege to, overcame and sacked with sickening slaughter the tottering Byzantine capital of Constantinople. Scuttling back to Venice with their loot (including the 4 bronze horses still seen on the facade of Sr Marks basilica) the venetians set to work to control the trading routes. The Byzantine empire was dismembered and Venice greedily clutched new possessions to her chest including the Peloponnese peninsula and Crete. Venice now controlled trade through the Adriatic, the Eastern Mediterranean, through the Dardanelles, into the Black Sea and as far as the Crimea. During the 14th century Venice was competing with its deadly rival the Genoese republic for control of the trading routes in the Mediterranean. After some scrappy battles, Venice was victorious, became pre-eminent in trade until superseded in the mid 15th century. Venice traded even as far as Northern Europe with its long range merchant galleys. Progressive loss of prestige and degeneration reduced the venetian republic to a shell until the latest bully Napoleon Buonaparte squashed Venice with his thumb in 1797. Here are some pics of the port quarter rudder in the up position. Note that the hoist is tight and the "uphaul" loose. Cheers Dick
  2. Steven, I am at about the same point with my round ship. That is, working out masting, associated tackle and deck furniture/machinery. There is very little contemporary help and the Black Sea is keeping its secrets for the nonce. However, there are some illustrations 12th and 13th century which show the halyard block and tackle heading obliquely at about 60 degrees back to the lower halyard block which is just in front of the poop or steersman . This is analogous to the way it is done in dhows. The halyard tackle was more vertical in carracks and cogs. I would be cautious using 19th century lateen rig as a model. I believe the pulleys in the "calcet" should point fore and aft so the yard can fall forward away from the mast (pole mast or built?) Dick
  3. Whatever type of truss you choose (and I don't think there are many wrong choices) you need to be able to loosen and tighten the truss with a tackle from deck level. The truss needs to be loosened to allow the yard to fall away from the mast (which is angled forward) so that the yard can be lowered or raised. It also needs to be loosened when the yard is transported around the mast during tacking (see Landstrom). Have you thought about where to put the halyard blocks? Dick
  4. Thanks, Druxey and Steven. The tackle as presently rigged allows an arc of 60 deg. That is 30 degrees in and 30 degrees out. This all that is required to steer since having a foil cross-sectioned rudder at angles of attack greater than 30 degrees leads to turbulence and a probable stall at 45 degrees (Gillmer and Johnson 1982 , Introduction to Naval Architecture. Quoted in L Mott: The Development of the Rudder.) Cheers Dick
  5. I have rigged the starboard quarter rudder using a system which I believe is shown in the Veneziano painting of the translatio of St Mark. The only way I could do this was to use a double pulley on the "uphaul" and with the ropes going under the throughbeam around the rudder and back up to the pulleys. The rudder hoist I have left as single pulleys. With the rudder in the down position the hoist is loose and the uphaul tight and pulling the rudder against the throughbeam. Dick
  6. The hull framing is complete and looks more tidy. Now to plan the deck beams Dick
  7. Steven, I have had a message from Prof. Mauro Bondioli. In his learned opinion, rudder blades were indeed coated with pitch. Dick
  8. Here are pics showing the framing of the bow and hawse timbers which need to be strong. Dick
  9. No. The aft end of the curved guides (inner and outer) is permanently fixed to an extended beam. To remove the rudder when in port all that is required is to disconnect the rudder hoist and "uphaul". The rudder is reversed out of the mount with the help of a boat. The rudder then is floated off and towed away by one of the boats. It is reinstalled in the opposite manner, again with the help of a boat. That is my interpretation. Also, do you think that the rudder blades were coated with pitch? The MIchael of Rhodes manuscript shows the blades blackened. Dick
  10. Alberto, what is your specialty in archaeology, if you don't mind my asking? Dick
  11. I closely read Lawrence Mott's thesis. the poop superstructure is based solely on Veneziano's Pala Feriale transport of St Mark, as is the bow structure (to follow soon). The length of the rudders is 1/3 of keel length (Fabrica di Galere and Michael of Rhodes) Having fun. Dick
  12. Thanks, Alberto for the links to Twitter. They did work and I have had a good look at the mediaeval merchantman from 13th century. The rudder mount seems to tally with mine and I feel somewhat encouraged. The Contarina I wreck upon which I largely based my reconstruction has been tentatively dated to 1300 and so can really be regarded as a 13th century vessel contemporaneous with the Black Sea example. Unfortunately Amazon wont ship the video to Australia and Amazon Australia has never heard of it. It will turn up somewhere, I suppose. I am now turning my attention to the bow which is more bluff than the Black Sea vessel. Here are pictures of the quarter rudders in the down and up position. Cheers Dick
  13. verrry interesting! I have not heard that. Can anyone clarify this? The wedges were solidly hammered in and woolded. It would be no mean feat to take them out and replace them for an extra knot or two even if the mast did not go by the board. Keel-haul the captain, I say! Cheers, Dick
  14. The structures surrounding the mast base at deck level are indeed wedges inserted around the mast at the mast partners. These wedges are then tightly woolded with stout rope (see my cocha build). Without these wedges at deck level, the strain on the mast foot would lead to early failure. The coin needs to be byzantine of the correct period, I agree. Dick

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