Wing aspect ratio calculator inches5/10/2023 This has occasionally caused some confusion for people using the calculator on other manufacturers' parachutes. For these parachutes, the Cd is adjusted so the resulting descent rate matches the manufacturers' published rates for that model. However, the Cd of the Spherachute parachute is set to 1.5 so the resulting descent rate matches the manufacturer's data. For example, a Spherachute 120" parachute has an equivalent diameter of 76.4 inches. This then becomes the reference diameter used to calculate the descent velocity.įor these parachutes, you will notice that the diameter is different from the size of the manufacturer. SOME EFFECTS OF CENTER OF GRAVITY LOCATIONS OF ADDED MASS ON TRANSONIC FLUTTER CHARACTERISTICS OF LOW ASPECT RATIO AND SWEPTBACK THIN CANTILEVER WING Eiichi. If you donate just 50, or whatever you can, WINGS OF AERO T.E.M.S Calculator could keep thriving. We depend on donations from exceptional users, but fewer than 2 give. For these, the equivalent reference diameter is calculated based on the geometry of the canopy while in flight. Hi user, it seems you use T.E.M.S Calculator that’s great This is an appeal we’ve shown you. This includes Rocket Man, Spherachute, Sky Angle and Giant Leap TAC chutes. Alternatively, in some cases, it's just a model number and we are not sure of the exact size. For some manufacturers, the parachute's size is measured by the distance (circumference) across the canopy. The drag area of the parachute is calculated as Pi * D / 4, where D is the reference diameter.įor flat sheet parachutes such as Top Flight, the reference diameter is the flattened diameter of the parachute - again, the diameter quoted by the manufacturer. For Fruity Chutes parachutes, this diameter is the same as the opening diameter of the parachute. * IMPORTANT NOTE ABOUT REFERENCE DIAMETER: Reference Diameter is used to calculate the descent velocity drag area. The plot will then graph the parachute performance based on weight.Ĥ) Hit return to update the plot after you override values, or press "Update" after changing any values.ĥ) Compare our parachutes alongside the products of other manufacturers. The form fields will auto-populate with the parachute's diameter and Cd (coefficent of drag).Ģ) You can override the diameter or the Cd to test how a different parachute would perform or how Cd affects performance.ģ) Enter the target weight. Leave this blank if you do not want a second parachute plotted. The optional parachute to compare with goes on the right. The primary parachute goes on the left side. To use the tool:ġ) Enter the parachute model you want to plot. This tool will plot the descent rate of two parachutes around the weight you specify.
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