Parks College Parachute Research Group

Conversion Factors (from textbook)

LENGTH:	1 m  = 3.2808 ft                 1 ft   = 0.3048 m
        1 km = 0.6214 mile               1 mile = 1.6093 km

AREA:   1 m2 = 10.76 ft^2                1 ft2  = 0.09290 m^2
                                         1 acre = 43560 ft^2
                                         1 sq. mile = 640 acres

VOLUME: 1 litre = 1000 cm^3              1 ft3 = 28.32 litres
        1 litre = 0.03532 ft^3           1 US gallon = 231 in^3
        1 litre = 61.02 in^3             1 Imperial gallon = 277.42 in^3

MASS:   1 Kg = 0.06852 slug              1 slug = 14.5943 Kg
        1 Kg = 1000 grams                1 lbm  = 0.4536 Kg

DENSITY:  1 Kg/m^3 = 0.0019403 slug/ft^3   1 slug/ft^3 = 515.38 Kg/m^3
          1 Kg/m^3 = 0.06243 lbm/ft^3      1 lbm/ft^3  = 16.018 Kg/m^3

VELOCITY:
        1 m/s = 3.2808 ft/s              1 ft/s = 0.3048 m/s
        1 m/s = 2.2369 mph               1 mph  = 0.44704 m/s
        1 m/s = 3.6 km/hr                1 mph  = 1.6093 km/hr
        1 m/s = 1.943 knots              1 knot = 0.5144 m/s

FORCE:    1 Newton = 0.2248 lbf            1 lbf = 4.448 N
          1 Newton = 105 Dynes

PRESSURE: 1 mm Hg = 133.32 Pa              1 in Hg  = 3.3865 kPa
          1 Pa = 10^-5 Bar                 1 in H2O = 249.1 Pa
          1 Pa = 1.45 x 10-4 lbf/in^2      1 lbf/in^2 = 6895 Pa    
          1 Pa = 0.02089 lbf/ft^2          1 lbf/ft^2 = 47.88 Pa   

ENERGY: 1 Joule = 1 Nm = 0.7376 ft lbf   1 ft lbf= 1.35582 J
        1 Joule = 0.0094787 BTU          1 BTU = 1055.06 J
        1 Joule = 0.2389 Cal             1 Cal = 4.1868 J    
        1 Joule = 2.78 x 10^-7 kilowatt hrs
        1 kwh   = 3.6 x 106 J

POWER:  1 Watt = 1 J/s = 0.7376 ft lbf/s
        1 Watt = 1.341 x 10^-3 HP        1 HP = 745.6 W   
        1 Watt = 3.4118 BTU/hr           1 HP = 550 ft lbf/s

VISCOSITY: 1 Poise = 0.1 Kg/m/s             1 Stokes = 10^-4 m2/s

ANGLE:  1 radian = 57.296 deg           1 deg = 0.01745 Rad    

Some specific speed conversions:

1 FPS = 3600 FPM = 3600/5280 = 0.681818181 MPH
1 MPH = 5280 FPH = 5280/3600 = 1.466666667 FPS
60 MPH = 88 FPS
120 MPH = 176 FPS = 44FT. PER 1/4 SEC.

Cypres AAD speeds/altitudes

Student Cypres activation speed:       29 MPH, 42.5 FPS, 2550 FPM
Expert/Tandem Cypres activation speed: 78 MPH, 114 FPS,  6863 FPM

Student/Expert arms going up through: 1500 feet
Tandem arms going up though:          3000 feet

Student activation altitude: 750/1000 feet
Expert activation altitude:  750 feet
Tandem activation altitude:  1900 feet

Repack Cycles

120 days is 17 weeks and 1 day

180 days is 25 weeks and 5 days

log file