# Difference between revisions of "AirFish"

## Contents

### Basecamp

The project management is through AirFish Basecamp

### Lift of balloon

1. The volume of a sphere is 4/3 * pi * r^3, where r is the radius of the balloon.
2. One cubic foot of helium will lift about 28.2 grams, so multiply the volume of the balloon by 28.2.
3. Divide by 448 -- the number of grams in a pound -- to determine the number of pounds it can lift.
``` (4/3) * pi * (r^3) * 28.2 = lift in grams
((4/3) * pi * (r^3) * 28.2) / 448 = lift in pounds
```

## Flip Video Camera

94g body 50g batteries (2-AA)

## S60 control

### Send an SMS with S60

This stuf looks trivial. This could be a very viable downlink. http://wiki.forum.nokia.com/index.php/How_to_send_SMS

```import messaging
messaging.sms_send('number', 'text')
```

## Pressure versus Altitude

 Barometric Pressure vs. Altitude Table ``` ``` Altitude Above Sea Level ``` ``` Temperature ``` ``` Barometer ``` ``` Atmospheric Pressure ``` ``` Feet ``` ``` Miles ``` ``` Meters ``` ``` F ``` ``` C ``` ``` In. Hg.  Abs. ``` ``` mm Hg. Abs. ``` ``` PSI ``` ``` Kg / sq. cm ``` ``` kPa -5000 -1526 77 25 35.58 903.7 17.48 1.229 120.5 -4500 -1373 75 24 35.00 889.0 17.19 1.209 118.5 -4000 -1220 73 23 34.42 874.3 16.9 1.188 116.5 -3500 -1068 71 22 33.84 859.5 16.62 1.169 114.6 -3000 -915 70 21 33.27 845.1 16.34 1.149 112.7 -2500 -763 68 20 32.70 830.6 16.06 1.129 110.7 -2000 -610 66 19 32.14 816.4 15.78 1.109 108.8 -1500 -458 64 18 31.58 802.1 15.51 1.091 106.9 -1000 -305 63 17 31.02 787.9 15.23 1.071 105.0 -500 -153 61 16 30.47 773.9 14.96 1.052 103.1 0 0 59 15 29.92 760.0 14.696 1.0333 101.33 500 153 57 14 29.38 746.3 14.43 1.015 99.49 1000 305 55 13 28.86 733.0 14.16 0.996 97.63 1500 458 54 12 28.33 719.6 13.91 0.978 95.91 2000 610 52 11 27.82 706.6 13.66 0.960 94.19 2500 763 50 10 27.32 693.9 13.41 0.943 92.46 3000 915 48 9 26.82 681.2 13.17 0.926 90.81 3500 1068 47 8 26.33 668.8 12.93 0.909 89.15 4000 1220 45 7 25.84 656.3 12.69 0.892 87.49 4500 1373 43 6 25.37 644.4 12.46 0.876 85.91 5000 0.95 1526 41 5 24.90 632.5 12.23 0.86 84.33 6000 1.1 1831 38 3 23.99 609.3 11.78 0.828 81.22 7000 1.3 2136 34 1 23.10 586.7 11.34 0.797 78.19 8000 1.5 2441 31 -1 22.23 564.6 10.91 0.767 75.22 9000 1.7 2746 27 -3 21.39 543.3 10.5 0.738 72.40 10,000 1.9 3050 23 -5 20.58 522.7 10.1 0.71 69.64 15,000 2.8 4577 6 -14 16.89 429.0 8.29 0.583 57.16 20,000 3.8 6102 -12 -24 13.76 349.5 6.76 0.475 46.61 25,000 4.7 7628 -30 -34 11.12 282.4 5.46 0.384 37.65 30,000 5.7 9153 -48 -44 8.903 226.1 4.37 0.307 30.13 35,000 6.6 10,679 -66 -54 7.06 179.3 3.47 0.244 23.93 40,000 7.6 12,204 -70 -57 5.558 141.2 2.73 0.192 18.82 45,000 8.5 13,730 -70 -57 4.375 111.1 2.15 0.151 14.82 50,000 9.5 15,255 -70 -57 3.444 87.5 1.69 0.119 11.65 55,000 10.4 16,781 -70 -57 2.712 68.9 1.33 0.0935 9.17 60,000 11.4 18,306 -70 -57 2.135 54.2 1.05 0.0738 7.24 70,000 13.3 21,357 -67 -55 1.325 33.7 0.651 0.651 4.49 80,000 15.2 24,408 -62 -52 0.8273 21.0 0.406 0.406 2.80 90,000 17.1 27,459 -57 -59 0.520 13.2 0.255 0.255 1.76 100,000 18.9 30,510 -51 -46 0.329 8.36 0.162 0.162 1.12