{"id":3681,"date":"2020-04-04T12:43:05","date_gmt":"2020-04-04T17:43:05","guid":{"rendered":"http:\/\/www.balsaworkbench.com\/?page_id=3681"},"modified":"2024-12-15T10:54:26","modified_gmt":"2024-12-15T16:54:26","slug":"make-a-paper-dihedral-template","status":"publish","type":"page","link":"https:\/\/www.balsaworkbench.com\/?page_id=3681","title":{"rendered":"Make a paper dihedral template"},"content":{"rendered":"

When you build a wing with dihedral, the root ribs need to be leaned inward at a specific angle to give the wings the correct dihedral angle. \u00a0This is easy to do with a dihedral template, which you can make from a piece of paper. \u00a0All you need to know is the length of one wing panel, and the amount each wing panel will be raised from the building board. \u00a0This can be tricky, so make sure you get this part right. \u00a0Let’s say your plan calls for a 72 inch wingspan and 2.5 inches of dihedral at each tip. \u00a0In this case our numbers would be 36 inches and 2.5 inches. \u00a0If your plan says 48 inch span and dihedral 4 inches at one tip with the other wing panel flat on the table, then that’s a 24 inch wing panel. \u00a0We want to imagine the wing sitting on the table like a V, so we have 2 inches at each tip. \u00a0If you’re building an 84 inch plane with a 12 inch center section and 4 inches of dihedral at each tip, it gets a bit complicated. \u00a0You have to make two dihedral joints where the panels join the center section. \u00a0Imagine one joint sitting on the table like a V with the root ribs standing vertical. \u00a0The center section is angled up on one side, and the wing panel is angled up on the other. \u00a0This cuts your 4 inch dihedral at the tip to 2 inches. \u00a0So your necessary data for our formula is 36 inch panel and 2 inch dihedral. \u00a0If you find any of this confusing, send me an email and I’ll walk you through it.<\/p>\n

Now you need a sheet of paper, a ruler, a pencil and an X-Acto knife. \u00a0We’re going to make a scale model of your root rib angle on the lower left corner of the paper. \u00a0Let’s use the example with a 48 inch span and 4 inches of dihedral at one tip. \u00a0The numbers we’re looking for are 24 inches and 2 inches. \u00a0Use a handy scaling unit that will fit on a sheet of paper. \u00a0I have a ruler with centimeters on one side, so I just count centimeters. \u00a0Measure from the lower left corner of the paper 2 cm to the right and make a mark on the lower edge. \u00a0Measure from the corner 24 cm upwards and make a mark on the left edge.<\/p>\n

\"dihedral\"<\/a><\/p>\n

Now place the ruler on these two points and cut with an X-Acto knife.<\/p>\n

\"dihedral2\"<\/a><\/p>\n

Discard the sliver of paper you cut off.<\/p>\n

\"dihedral3\"<\/a><\/p>\n

The angle you have created on the corner of the sheet is the angle your root ribs need to lean inwards. \u00a0To make it easier to see which way to use the template, cut the other corner off so it’s round on that edge. \u00a0That way you’ll never use the wrong corner by mistake.<\/p>\n

\"dihedral4\"<\/a><\/p>\n

Place one edge of this paper flat on the table, and position the rib with the other edge.<\/p>\n

If you are working with numbers that are just too big for a sheet of paper, such as a 96 inch wingspan and 5 inches at each tip, you’ll need to scale things down even further. \u00a0You can’t measure 48 cm on a piece of paper because the paper isn’t that big. \u00a0Just divide it by some convenient number, but make sure you divide your dihedral number also. \u00a0You started with 48 and 5, so divide by 2 and get 24 and 2.5. \u00a0This is small enough to fit on a sheet of paper.<\/p>\n

You can also use your paper template to make a dihedral brace.\u00a0 First mark the center of the dihedral brace that will be cut out of a piece of plywood.<\/p>\n

\"dihedral\"<\/a><\/p>\n

Then flip the paper over and draw the angle going the opposite way.<\/p>\n

\"dihedral2\"<\/a><\/p>\n

Now you have two lines on your plywood showing the bottom edge of the dihedral brace.<\/p>\n

\"dihedral3\"<\/a><\/p>\n

Measure up from these lines to get the top edge of the dihedral brace.\u00a0 Let’s say it’s supposed to be an inch and a half tall and extend 4 inches into each wing panel.\u00a0 You can simply measure these distances from the two bottom lines, or you can make a little paper template 4 x 1.5 inches and trace around it on each side.<\/p>\n

\"dihedral4\"<\/a><\/p>\n

Now all you have to do is cut around the edges and you have a dihedral brace.<\/p>\n","protected":false},"excerpt":{"rendered":"

When you build a wing with dihedral, the root ribs need to be leaned inward at a specific angle to give the wings the correct dihedral angle. \u00a0This is easy to do with a dihedral template, which you can make … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":25,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/www.balsaworkbench.com\/index.php?rest_route=\/wp\/v2\/pages\/3681"}],"collection":[{"href":"https:\/\/www.balsaworkbench.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.balsaworkbench.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.balsaworkbench.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.balsaworkbench.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3681"}],"version-history":[{"count":4,"href":"https:\/\/www.balsaworkbench.com\/index.php?rest_route=\/wp\/v2\/pages\/3681\/revisions"}],"predecessor-version":[{"id":6850,"href":"https:\/\/www.balsaworkbench.com\/index.php?rest_route=\/wp\/v2\/pages\/3681\/revisions\/6850"}],"up":[{"embeddable":true,"href":"https:\/\/www.balsaworkbench.com\/index.php?rest_route=\/wp\/v2\/pages\/25"}],"wp:attachment":[{"href":"https:\/\/www.balsaworkbench.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3681"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}