Richard Braithwaite
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The Gokstad Ship 900 AD by Siggi52 - 1:50
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Trireme Olympias by Richard Braithwaite
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Finished fitting 62 handles to the Thranite oars... Now rethinking the blades. I havent been able to find drawings of the original Thranite oars in the Trireme Trust Archive. However there is a drawing showing how these were modified in 1989 to reduce their weight from 17kg to 6 kg by shaving down the shafts, and reducing the thickness and area of the blades. Extracts from the Midhsip Section (Plan 8 ) and the Modified Oar drawing (Plan 15e) show how the form of the blade was altered. The upper plan view is of the original form and the lower plan and section shows the modified blade. Extracts from Plan 8 and 15e( © Estate of John F. Coates, reproduced with permission) The oval form of the blade was also intended to make them slide over one another more easily to reduce entanglement. As you can see from the section view the blades were not simple flat pieces of wood, as I had originally planned for my model, but were tapered. The form of this tapering in the original design is sugested by this image of the full size ship. Ive reconstructed this form in the following sketch for my model: The lines in the plan view radiating from the end of the shaft prongs show the edges of the tapered faces which I will need to machine in the blades, although the photograph sugests that the inner faces were faired to remove any hard edge. So, I now need to make up some more jigs...
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Richard Braithwaite reacted to a post in a topic:
The Gokstad Ship 900 AD by Siggi52 - 1:50
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The Gokstad Ship 900 AD by Siggi52 - 1:50
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Richard Braithwaite reacted to a post in a topic:
The Gokstad Ship 900 AD by Siggi52 - 1:50
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Richard Braithwaite reacted to a post in a topic:
The Gokstad Ship 900 AD by Siggi52 - 1:50
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Richard Braithwaite reacted to a post in a topic:
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Trireme Olympias by Richard Braithwaite
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Trireme Olympias by Richard Braithwaite
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So, 62 oar shafts all tapered and rounded.... Next stage, making and fitting handles: The oar shaft is drilled to take a brass rod to act as a core for the removable handle and also as a bearing to the connector that will hold the oars in place within the boat. I machined a brass section to the same dimensions as the oar shaft drilled at its center to enable the drill to be properly aligned with the center of the oar shaft as shown below. The second image shows the brass rod in place and the oar shaft marked out for shaping the transition to the handle The oar handles are then drilled and turned befor fitting over the brass rod on the oar shaft as follows: The total time taken for all this is about 0.5 hour (if I'm working efficiently!). (Total cummulative time/oar, so far 2.25 hours...)
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74 Gun Ship by Jeronimo - 1/36 - Modified to Cross-Sections
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Boudriots 74 gun ship series are some of the loveliest books out there. Real works of art in themselves... Your model really does them justice and its a real joy to see such craftsmanship. Its also reassuring to see other people out there spending decades building a model!
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Im creating quite a lot of sawdust at the moment... So, improved dust protection of model required (it took a lot of time to hoover out all the accumulated dust and clean before I varnished last year...). I also wanted any cover to be transparent so that any darkening of the model (now its varnished) will be even. Found these 0.19mm Acetate Mylar sheets (300x600mm), which folded quite neatly over the deck (extending over the sides and covering all the oar ports).
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Your ship is looking fantastic. I built the hull of my "Olympias" model is a similar way (planking first and then frames made to fit). My log starts after I had done this, but I think ive included some description somewhere... Interested to know if you made those frames to fit your planking or made them from patterns and then pulled the planking to fit them? I remember working on an old steel ship, which we were rebuilding to make a different sort of ship... I had designed a substantial, cambered frame to fit under a thin, lightly stiffened deck. Our shipwrights tried to fit it on a hot day. They made the frame with some extra material ("green"), craned it into place, marked it off to fit the undulations of the (old battered) deck and then took it back to the dockside to cut it to their marked shape. When they craned it back on board they found that the deck had changed shape (the sun was now shining on it from a different direction...). So they marked it off again and repeated the process. After repeating this a few times they had cut off all the "green" and then some. They called me to come down to the ship and asked it I minded that the frame was now quite a bit smaller than I had intended... The next day we tried again. We cut a new frame to the design shape (no "green") and pulled the deck down to fit it. Your hull planking is very light, have you had any difficulties with distortion as you fit your frames?
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Apologies if ive missed it in your log, but what have you used as fastenings for the planking? It looks very effective.
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Next stage of making oars: 1. Mill the slot for the blade using a 0.5mm cutter: 2. Cut off end of oar (leaving a small part beyond the end of the oar slot to aid stability during shaping) and sand the shaft down to finished square section dimensions, including the transition from inboard oar loom to outboard shaft. 3. Mark up with "indicator" pensil lines along the shaft to assist with "octagonalising". 4. File/sand off corners to make an octagonal section (including the transition from the square section loom to the outboard shaft. I find the "indicator" lines helpful with getting the faces of the octagon even, aiming to get the resulting "dashed line" around the staft even. 5. Round the shaft until the indicator lines just dissapear (indicating the final dimensions all round have been achieved). 6. square off the end of the loom to the final dimension to accept the oar handle (this will still require finishing to transition to the round handle, once the handles are fitted). Total time for all this approximately 45 mins/shaft (Total cummulative time/oar, so far, 1.75 hours)
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I wont be overcoating the white enamel paint with varnish this time. Just trying to decide what to do underneath it. Have heard that a shellac primer might help prevent pigments coming through.
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The upper image in the picture below shows some wood (Ash) that I painted 40 years ago. All the planking was coated with about 5 coats of polyurethane varnish and a couple of coats of black/white Humbrol Enamel was applied directly on top with a further coat of polyurethane varnish on top to proect it. As you can see the white paint has discoloured slightly , Im not sure whether this is due to the yellowing of the polyurethane on top or pigments comening through from underneath... The lower image shows part of the full size Trireme reconstruction "Olympias". I am building a model of this vessel (Trireme Olympias by Richard Braithwaite - - Subjects built Up to and including 1500 AD - Model Ship World™) . The model is finished with polyurethane varnish and I need to decide how to finish the oars (varnished shaft, white painted blades) So far Im thinking of two alternatives: 1. Coat the entire oar (blade and shaft) with polyurethane and then coat the bade with primer and overcoat with white enamel. 2. coat the shaft with polyurethane up to the boundary with the blade. Apply primer to the bare wood of the blade and overcoat with enamel. The second option would make most sense in terms of keeping the different paint systems separate, but I suspect i could do a neater job with the boundary with the first option. What experience do you have with this sort of paint scheme?
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Very neat. Rather more elegant than the graph paper plot followed by tricky manal dial turning i have used for complex machined shapes! I did think of making this jig from brass/ aluminium. But, so far, my quick wooden effort seems to be stiff and durable enough... Have you had any success turning tapers on long slender wooden shafts such as oars and spars? If i could make that work it would be much better than what im doing ( machining to a square taper and then manually " octagonalising" and rounding). However, whenever ive tried turning this sort of thing it fails due to vibration/ flexing.
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First stage of oar production. The jig bolts onto the milling table of my Unimat and allows for different tapers to be milled by fitting a spaced under the bolted on top piece. 4 setups required per oar shaft to taper each side (so the jig has to last for 4 x 170= 680 setups and clampings - hence protective strips of wood under clamps!). Each oar shaft takes about 1 hour to machine to a square taper (including marking up) with the milling cutter making 5 x 0.2mm cuts per side. The cutter could certainly manage deeper cuts on this soft wood but 0.2 mm seems the most I can safely do without too much vibration and sideways deflection of the oar shaft (particularly the last few cuts when it is at its most slender). A wedge is fitted underneath the tapered part of the shaft for alternate sides to prevent vertical deflection. (wedge machined to the same taper - using the same jig.) The image below shows the setup after each of the 4 sides have been machined. The supporting taper can be seen fitted under the shaft on the images on the right (2nd and 4th setup)
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Spent the day milling timber for the Thranite oars using my Byrnes Table Saw , starting with a nice close grained, 30mm thick plank of lime that Ive been using for the spars and intend to use for the oar shafts. Here is one of my Athenian marines posing by the stack of timber that I now need to convert into 62 oars for the top level of my ship. After Ive done that there is only another 108 to do for the other two levels... - quite a daunting prospect... I must say, building this model has increased my respect for the Anthenians and the way in which they managed to build such large fleets of ships so quickly (and all those oars!!)
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