--- /dev/null
+eps = 0.01;
+infty = 200;
+
+wing_tube_d = 8;
+joint_l = 50;
+dihedral = 10;
+
+wall = 1.5;
+
+
+translate([-sin(dihedral)*(wing_tube_d/2+wall), 0,
+ joint_l*sin(dihedral) + (wing_tube_d/2+wall)*cos(dihedral)])
+rotate([0, 90+dihedral, 0]) cylinder(r = wing_tube_d/2 + wall, h = joint_l);