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A view from the top of the wing. You can see the cables running through the ribs, with 2 inch lengths of pipe as guides. Firstly, drill holes in rib 1 (nearest the fuselage), then use string to mark the line of the cable. Then use *mathematics* (eek!) to work out how far up the rib the hole should go. It's actually quite straightforward, and pleasing when I drilled small pilot holes and found that I had been quite accurate with my marking. There are two pulleys on the headrack - I used the rearmost one for the flap cable, and the forward one for the aileron, otherwise the flap cable rubs against the main spar.
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This is the flap pulley - you can see the cables going through the guide tubes too. The flap has a spring action to it, one end of the spring goes onto a tab attached to the pulley block. The other end fixes to a tab on the flap spar tube. This means cutting out the trailing edge and also the leading edge of the flap. I guessed the amount of material to cut out, and it may need a little bit more finishing, but so far the guess is not too far off.
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The underside of the flap - this shows where the tab goes on the spar tube. There is a small semi-circular piece cut out of the bottom of the leading edge - this is to get the rivet gun in! I can patch it later with some scrap leading edge material.
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Again, this picture is not brilliant, but it shows roughly how much needs taking out of the leading edge of the flap. |
Now I have working flap and aileron on one side. I need to fit a plywood stop for the flap ( to stop it going too far up) but otherwise I can control them with cables! I can't wait to connect them to the control stick... Next page