![\"dsc_0523\"](\"http:\/\/www.balsaworkbench.com\/wp-content\/uploads\/2017\/01\/DSC_0523.jpg\")
<\/a><\/p>\nThis is a straight edge. Notice that this plan shows the top wing on the left and the bottom wing on the right, so you have to mark the rib locations on at least half of the sheeting. \u00a0You can build with no plan at all if you mark all of your rib locations and draw a couple of parallel lines and a perpendicular line on your table. \u00a0After you mark your rib locations pin the sheeting\u00a0down on the building board. \u00a0(As you can see in the photo, I’ve actually drawn the rib locations on the bottom spar.)<\/p>\n Glue the spar to the bottom sheeting, then add the ribs. \u00a0Use a square to make sure the ribs are vertical.<\/p>\n After you place all of your ribs and glue them, add the top spar and the top sheeting. \u00a0For the top leading edge sheeting, choose wood that will easily bend without cracking. \u00a0If you don’t have any, you can get the wood to bend more easily by wetting it. \u00a0Wet only the outside, then stick the sheeting onto the top spar and the ribs with medium CA glue. \u00a0Before you add the top sheeting, pull the pins from the bottom sheeting, and hold the wing flat on the table with your hands while adding the sheeting. \u00a0Unfortunately it’s hard to take photos of this step because I can’t use my hands for the camera and installing sheeting at the same time.<\/p>\n When you have the top sheeting, bottom sheeting, and leading edge in place, your wing can still twist. \u00a0When you add shear webs, you will make your wing stiff and untwistable. \u00a0Set it flat on the table and hold it in place with cans of beans, or some other heavy object. \u00a0Place the shear webs one by one, using medium CA glue.<\/p>\n The leading edge, the top and bottom sheeting, and the shear webs form a structure known as a D-tube. \u00a0When all parts of this tube are complete, the wing will no longer twist, and it is safe to pick it up and add parts to it without it being on a flat table. \u00a0But I like to keep the wing flat on the table while adding trailing edge sheeting as well, just to make sure. \u00a0Find the straight edge of the trailing edge sheeting and put it at the trailing edge of the wing, to make sure the wing is straight. \u00a0If one side is warped, put it toward the inside where it doesn’t make any difference. <\/p>\n Now everything is pretty much locked into shape, and you don’t have to worry so much\u00a0about it staying flat while you add other parts.<\/p>\n","protected":false},"excerpt":{"rendered":" The easiest way to build a flat bottom wing is on a flat building board. \u00a0My building board is a cheap hollow core door from Home Depot. \u00a0You can use anything that stays flat and holds pins. \u00a0In the following … Continue reading <\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n