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Reconstruction of the Hjortspring boat This part deals with our understanding of the position of the bottom boards in the boat (it differs from the National Museum's). Also the manufacture of paddles and rudders. Schematic representation and naming of the Hjortspring boat's structural parts. (1) Deck boards, paddles and rudders Around 85 boards were found, tapered at each end, approximately 120 cm long, 7-8 cm wide and around 1.5 cm thick. Most were made of lime, a few of ash. We have interpreted them as deck boards.Rosenberg (2) thought that these boards should protect the seams at the bottom of the boat. We disagree, there is a need for foot support when paddling, so we placed them on the deck beams (3).The first version of the deck boards were too flimsy for the, perhaps, slightly too heavy paddlers. They broke. So a brand new set was made in mirror-split ash. The picture is from May 2020.A suitable number of paddles had to be made. They are all individual, with different shaped handles and a length corresponding to the position in the boat. They should be longer at the front and back of the boat.The blade of the paddle is very narrow. This is necessitated by the high paddle rate - approximately 1.5 s per stroke.The surface of the paddles should be very smooth at the handle. The blade should be sharpened at the end so it breaks the water in a good way.A collection of paddles. Most are made of ash, one of lime and without a handle.The stern of the Hjortspring boat at the National Museum of Denmark. However, the remnant of a rudder was found in the front end. The steering oar is mounted on the starboard side aft of the small deck (4).A rudder is completed. The length of the rudder blade and shaft is our choice.Rosenberg (5) mentions the possibility of some kind of outrigger at the cleats on the stem block. This is an attempt to make such a rudder bearing.The rudder bearing attached to the cleats of the tail block.The rudder bearing mounted in place on the cleats and over the stretch rope. The National Museum team is measuring the boat for a 3D model of our boat.A rudder is suspended in the outrigger (4). The solution was rejected. It was too unstable, perhaps due to the stretch rope.Instead, the rudder was attached to the hazel branch at the aft thwart. This location was used in the early days, until testing began together with the National Museum of Denmark.From the very first sail. Note the position of the rudder aft (left). The angle of the rudder oar - approx. 45° - results in poor rudder efficiency (4). You can do this with the images above If you:Hover over an image, an explanation will appearClick on an image and it and all the others will be displayed in large size. You can switch between images using the mouse, arrow keys or an arrow in the image. To return, click on the cross in the top right corner Horns Measurement Sources GR: Rosenberg, G., Hjortspringfundet2. GR. p. 863. Description of our work with the deck4. Description of our work with the versions of the rudder position.5. GR. p. 88 Language The text in this article has been translated from Danish to English using the free DeepL translation programme.
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Reconstruction of the Hjortspring boat This section covers the horns, their manufacture and attachment to the bottom plank and stem blocks. Schematic representation and naming of the Hjortspring boat's structural parts.(1) Horn A curved lime branch is roughly carved into a keel horn.Hook, tongue and groove assembly for a keel horn has begunAnd in close-up.The raw keel horn is mounted for centre marking with a plumb line from the reference wire in the ceiling.The almost finished keel horn mounted for directional control.The joint between horn and bottom plank is almost completeThe boat is being taken down from the bed and moved to the front of the room. There must be room for the railing horn in height. And the space behind the boat must be used for other purposes.The boat has now been given its final place in the workshop and set up by reference wire in the ceiling. The railing horn is set up for marking.The extension of the stem block is cut to act as an tongue in a tongue and groove joint with the railing horn. It is unclear how the horn was made: a natural branch on the stem of the stem block, or as here, attached.The railing horn is roughly shaped and the groove is finished.Fine-tune the butt joint against the tail block.The tongue and groove assembly is almost in place. We need to remove some of the underside of the tongue and glue it in place.The final adjustments to the assembly. The keel horn is secured with a pair of temporary dowels.Finalising the surface of the horn.A hole is cut in the keel horn for the outer locking plate.Making a rivet hole to secure the outer locking plate.The outer locking plate is mounted aft.Measure up to the outer locking plate at the stem.There is now a rectangular hole in the railing horn and a similarly shaped hole in the keel horn. These are aligned in relation to each other.The outer locking plate is inserted and holes are made for the locking pins. The keel horn is not yet glued in place, to install the locking plate, remove the keel horn and push the locking plate all the way up into the railing horn before reinstalling the keel horn and pushing the locking plate back down.The outer locking plate is now in place. The keel horn can now be glued to the bottom plank and all four locking pins fitted. You can do this with the images above If you:Hover over an image, an explanation will appearClick on an image and it and all the others will be displayed in large size. You can switch between images using the mouse, arrow keys or an arrow in the image. To return, click on the cross in the top right corner Rib-frames Bottom boards Kilder 1: Kaul, Flemming, Da våbnene tav, fig.11, p.19 Language The text in this article has been translated from Danish to English using the free DeepL translation programme.
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Reconstruction of the Hjortspring boat This part deals with the rib frames. Schematic representation and naming of the Hjortspring boat's structural parts. (1) Rib-frames Roughly chopped lime tree trunk.The rough seat.A roughly shaped thwart.Seat and beam are shaped.Shape the underside of the thwart.A fully shaped thwart compared to a 1:1 scale drawing. The seats on all thwarts are the same size, only the bar between them is different.A finished rib frame. Most rib frames consist of the five parts shown, except for no. 10 and no. 1, they only have one column. In addition, No. 1 is very special.Tofte no. 1 - the aft thwart is roughly adapted.Details are cut out on thwart no. 1.Thwart no. 1 together with a support beam.The cleats at thwart no. 1 are specially designed. It is our own construction, as there are no preserved parts from this part of the findThwart no. 1 put in place aft. Note the cut-outs and holes at the bottom of the thwart.A small stern bulkhead is mounted at the rear of the railing planks and the first plank for a small deck is in placeStern thwart, stern bulkhead and deck in place.The boat is now tarred inside, the thwarts treated with linseed oil and a ‘stretch rope’ has been fitted between the cleats on both stern blocks.The stern bulkhead with its fine carvings, also on the stern side. The stretch rope is attached to the cleats on the aft stern block. You can do this with the images above If you:Hover over an image, an explanation will appearClick on an image and it and all the others will be displayed in large size. You can switch between images using the mouse, arrow keys or an arrow in the image. To return, click on the cross in the top right corner Gunwale-planks Horns Sources 1: Kaul, Flemming, Da våbnene tav, fig.11, p.19 Language The text in this article has been translated from Danish to English using the free DeepL translation programme.
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Reconstruction of the Hjortspring boat This section covers railing planks, manufacturing and sewing for side planks and stem blocks. Schematic representation and naming of the Hjortspring boat's structural parts. (1) The railing planks, 1997 - 1998 Glue on the missing wood of the railing planks. The extension pieces are aligned with a 20 cm inclined overlap and screwed, temporarily, to the railing plank.The extension plank is screwed to the railing plank. The butt joints also have an inclined overlap of 20 cm.Piece by piece, the railing plank becomes wider.Length and end joint.Glued with System West. Larger screws with sheet metal nuts are used on the back to ensure maximum retention in the soft lime wood.All extension planks are now glued in place. The cuts are made at the butt joint between the planks to reduce stiffness, i.e. a more secure compression.The railing plank on the starboard side is set up for marking purposes.The centre line of the cleats is marked on the railing plank.Mark the cleats from the centre line.The cleats are cut out.The top cleat at the railing should be ‘crescent’ shaped. There is a model at the front of the image.Roughening of the upper cleats.The cleats on the starboard railing plank are complete. However, the cleats at frames 1 & 10 are the exception, they are made when the railing plank is mounted.Starboard railing plank strapped to the templates for alignment with the side plank.Adjust the edge of the railing plank to the right angle with a band knife. Start at the centre of the boat and work piece by piece towards the bow and stern.It must be controlled.The sewing is started mid-ship.The two planks are clamped together in front of the seam with this device.Both railing planks are sewn simultaneously to prevent the boat from warping. There are two helpers under the boat to tighten the seams.Preparation and marking for the alignment of the railing planks to the stem block.The stem block surfaces are adapted to the railing planks.Align the railing edge of the stem block with the railing plank.Final adjustments before sewing.Starboard side about to be in place.The last template is removed. They are replaced by a spacer and a string to hold the plank in place.The sewing is approaching the stern.Sewing holes at the railing plank and stem block.The two sewing holes in the railing edge are drilled perpendicular to the oblique joins.The cleats at frames 1 & 10 are made on site to ensure they are horizontal.The finished seam, outside.The finished seam, inside.
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Reconstruction of the Hjortspring boat This part covers the side planks, manufacturing and sewing for the bottom plank and stem blocks. Schematic representation and naming of the Hjortspring boat's structural parts. (1) Side planks, 1996 - 1997 The stems are sewn to the bottom plank. A set of shape templates is attached.The front stem block is sewn to the bottom plank.In addition to the stitching, the stem block is also locked to the bottom plank with a through-going light tapered pin, which is then secured with a wedge.The bottom plank is prepared for the joint with the lower horn; the stem wood (oak) is mounted and secured with an oak pin in the same way as the stem block, both in the upper and lower horn.The templates are secured against twisting and screwed to laths in the bottom of the boat, which are tied to the cleats in the bottom plank.A side plank is held in place with cords through the plank cleats.Mounting templates have been set up to hold the planks in place. The cleats on the starboard side plank are being cut out.Prepare the starboard side plank for sewing. Check the progress of the railing.A total of three plumb bobs, suspended from a steel cable under the ceiling, are used to ensure that the boat does not twist when the planks are sewn on. The planks are sewn from amidships and towards the bow and stern and on both sides simultaneously.Adjusting the side plank edge to match the bottom plank edge. Here at frame 10. Note the change in angle of the bottom plank edge.The sewing is approaching the bow block and the sewing of the side plank to the bow is being prepared.Preparing to sew the side plank to the bow. The wood pieces protect the holes when the white cords are pulled tight. Linden wood is a bit soft.The side plank is now sewn to the bow.Railing plank set up. As you can see, some wood is missing. It will be dealt with later!Once both side planks were in place, we had a party (again) on 8 June 1997. Various working methods were demonstrated, including how to make 2-strand sewing cord. You can do this with the images above If you:Hover over an image, an explanation will appearClick on an image and it and all the others will be displayed in large size. You can switch between images using the mouse, arrow keys or an arrow in the image. To return, click on the cross in the top right corner Keel-plank Gunwale-planks Sources 1: Kaul, Flemming, Da våbnene tav, fig.11, p.19 Language The text in this article has been translated from Danish to English using the free DeepL translation programme.
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