3. Catenary cut tool

A catenary is the curve that an idealized hanging chain or cable assumes when supported only at its ends. This shape is optimal to redistribute evenly the tension on the angles of the tent. The back and the sides will be cut on the perimeter using this tool to improve the resistance of the fabric and the overall ventilation of the tent.

■ Find a rectangular piece of cardboard that is longer than 160 cm

■ Measure approximately the center of the cardboard and from there measure 80cm on both sides (point A and C). Mark these measures.

■ From the middle measure 10cm perpendicularly to the side of the cardboard (point B)

■ Take a string, prefereably one of polyester that has a diameter of 1-2mm, and fix it to point A with a needle.

■ Pin a needle on point C and tie the other extremity of the string to it. Make sure that when you pull the string the lowest point of the curve formed must be coincident with point B.

■ Proceed to pin in place the string by adding as many needles as needed to make sure that it doesn’t move.

■ With everything in place, use a spray can to lightly paint over the string. Make sure that you spray at a 90° angle.

■ After the paint has dried out carefully remove the pins and the string, this should leave a clear impression of the curve on the cardboard.

■ Cut along the curve as precisely as possible. This tool will be used to mark the curve on the fabric hence the edges must be as clean as possible to have a accurate sign.