PARACHUTE CALCULATIONS

1. Free-fall vertical velocity without air friction
2. Parachute vertical velocity with air friction
3. Dynamic wind pressure
4. Temperature lapse rate
5. Pressure at altitude h above sea level
6. Density of air
7. Real and projected parachute surface. Influence in vertical velocity calculations.
Parachute drag coefficent.

8. Spreadsheet including the above formulation

1. Free-fall vertical velocity without air friction

 Free-fall vertical velocity without air friction h (m) v (m/s) v (km/h) 0,5 3,13 11,28 1 4,43 15,95 1,5 5,42 19,53 2 6,26 22,55 2,5 7,00 25,21 3 7,67 27,62 3,5 8,29 29,83 4 8,86 31,89 4,5 9,40 33,83 5 9,90 35,66 10 14,01 50,43 25 22,15 79,73 50 31,32 112,76 100 44,29 159,46 150 54,25 195,3 200 62,64 225,51

2. Parachute vertical velocity with air friction

3. Dynamic wind pressure

4. Temperature lapse rate

 h (m) T (ºC) 0 15,0 50 14,7 100 14,4 150 14,0 200 13,7 250 13,4 300 13,1 500 11,8 1000 8,5 1500 5,3 2000 2,0 2500 -1,3 3000 -4,5 3500 -7,8 4000 -11,0 4500 -14,3 5000 -17,5
Temperature variation al altitude h above sea level. Example with 15ºC at 0 m.

5. Pressure at altitude h above sea level

5.1  Pressure at altitude h above sea level

5.2 Pressure at altitude h in isothermic atmosphere (Laplace law)

6. Density of air

Density of air is 1,225 kg/m3 at ISA atmosphere 15ºC (=288,15ºK) and 1013,25 hPa.

7. Real and projected parachute surface. Influence in vertical velocity calculations.
Parachute drag coefficent.

8. Spreadsheet including the above formulation

Parachute calculations.xls  (MS Excell .xls format)

Parachute calculations.odf (Open Office spreadsheet .odf format)