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Old 02-20-2010 | 03:52 PM
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dbacque
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Default RE: Dirty Birdy Instructions Update


Completing the Wing

1. Step 3 (trimming LE, spars and sheeting flush with root rib) must be done in order to set the angle of the root rib. Trim them close and then sand a little at a time, checking the angle frequently.

5 & 6. I built mine with a servos in the wing. If you choose to do this, steps 5 and 6 become: Cut Center Section Trailing Edge pieces to size. Align & glue.

8. If you haven’t already drilled Bulkhead #2 for the wing dowels, draw a center line on the LE.

13. For paragraph 2 of this step, I covered this area of the wing with Scotch Tape and tack glued the Wing Fillet Base Pieces on.

15. At the end of this step, do not remove the wing yet. If you do, the Wing Fillet Base Pieces may pull up a little leaving a gap between wing and fillet.

16. When you glue the back of the fillet base pieces to the fuse sides, do not pull them in to meet the fuse! If you do, the fillet will want to pull away from the wing at the outside edge. Instead, use triangle stock as a glue block and then add a piece of wood to fill the gap. None of this matters, it’s all going to be filleted anyway.

If you have waited to drill Bulkhead #2, make a mark on the fuselage sides right at the centerline of the leading edge

Now remove the wing.

If you have waited to drill Bulkhead #2, draw a line across the bulkhead connecting the two marks you just made. Now drill the bulkhead and the holes will be exactly aligned with the LE of the wing.

21. If you set the Landing Gear Blocks flush with the ribs as I did, you will not have to cut out the sheeting to go around the blocks. But after mounting the sheeting you will need to make a slot through the sheeting in line with the slot in the block. You can find the correct location by sticking a pin through from the inside on each side of the block. The slot will be right between the pin holes.

Add Bottom Cap Strips. If you are building servo bays in the wing panels, you may want to omit two cap strips on each side to allow for your servo mounting.

22. Use the razor plane to rough shape the leading edge. Then use the sanding block. Tape off the sheeting to protect it

Before adding the Tip Blocks, I install the ailerons to help guide in shaping the tip. Do not bevel the ailerons yet! Just hinge them and mount in place. Make sure they’re aligned with the inboard trailing edge.

Add the Tip Blocks. Carve tips flush with wing using razor plane (cover sheeting with blue painters tape first). Get tip close to shape of airfoil, then sand everything flush. Mark center line around outside of tip block. Now carve everything to shape.

Since I’m nuts, at this point I cut a 1/2” wide strip of 1/16” balsa and used the razor plane to carve it down to triangle stock. I used this as a fillet around the 1/16” Ply Wing Hold Down Plate. Or you can just fill this area later as the plans call for. These fillet pieces are visible in the picture of the wing hold down plate.

26. The Wing Fairing Front & Sides are 2 pieces of 1/4” x 7/8” x 3 1/4". I carved the Wing Fairing Bottom to conform to the bottom of the wing. See the picture of the Wing Filler