We are providing 2.4 oz. and 2.9 oz. carbon fabrics with a bias cut option. The illustration below will give you a visual on how we do this. The result is a parallelogram. If you order a 1-foot piece, the short side will measure 12 inches and the long side 55 inches. The most critical dimension is the 8.25 inches perpendicular to the 55 inch cut edge.
Model aircraft builders typically use this cut on the leading edge of their wings to carry torsion loads. To create a d-box, wrap the bias cut carbon from the top of the spar, around the leading edge to the bottom of the spar. The spar acts to close the d-box. To determine the amount you need to order, measure the distance around the leading edge and divide by 8.25". Round up to the next whole number and order that many feet. For example: If you measure 7" and you are making two wing d-boxes, divide 14" by 8.25" = 1.7 or 2 feet. You will receive a piece 24" on the short side, 55" on the long side and 16.5" perpendicular to the long side. See the diagram below: