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I have no photos of the installation of the back side of this beam. The forward side was covered in the joining of the hulls and bringing up the bridgedeck. The construction of the backbeam has been covered previously. It is built from 9 mm ply with 450 gram DB glass on both sides. When installed as a one piece unit, it was laid on top of a heavy schedule of uni tape and 750 gram tri-ax. There are four webs built into the beam, also 9mm ply laminated with 450 gram DB.

This is looking down into the starboard side with aft above and forward below. I want to put a deck inside there so I cut off access to the lower hull from water and to provide a small compartment that will be water tight stowage for binoculars or other stuff.
 This side view with aft down and forward above. The balsa panels that make up the forward section of the beam had some wobbles so have clamped against timber to stabilise. You can see sticks glued in place in the beam closer to the lens. These will support the decking for the stowage compartment. Also I have glued on a piece of 9mm ply for the outside panel of the beam. could have used anything but ply was handy.
 Better look down the hole. I did tape these joins right after the picture. They won't be accessible again.
 With glue mix covering the sticks, I insert the decking and weight it down.
   This piece of fine pine was filched from Malcolm Salisbury's shed. Better than can be gotten anymore. It will be the supporting member for the main sheet track. After the top is buttoned on all that will be covered in glass. You can now see the hole that will access the area. I have port lights to fit.
   All the access holes have been cut on the forward side of the beam so now the clamps can be moved away from the top edge. The pine has been covered in glue mix. You can see the decking finalised in this shot, with peel ply over the tapes.
   The 20mm decking is foam laminated with 800gram DB both sides. It was glued and weighted down, glue now set and bricks removed. On the curved sides, the temporary screws are ready to be pulled so the lot can be faired.
   All the edges cleaned off.
 And sanding work done. Now you can see the holes for hatches and lights.
 All materials prepared. Wetting table ready
 and finished, at least for now.

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