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)