Difference between revisions of "AirFish"

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(Pressure versus Altitude)
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[[Category:Science]]
 
[[Category:Engineering]]
 
[[Category:Engineering]]
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AirFish or Air Fish
  
 
=== Basecamp ===
 
=== Basecamp ===
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The project management is through [http://airfish.updatelog.com/clients AirFish Basecamp]
 
The project management is through [http://airfish.updatelog.com/clients AirFish Basecamp]
  
=== Lift of balloon ===
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== weight of line to estimate length ==
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I let the balloon go nearly 90 degrees vertical up. I didn't know the length of the line. When I pulled it back in I weighed the line at 35.75 g. I figured that later I could weigh pieces of known lengths of the line to estimate the total length.
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== Lift of balloon ==
  
 
# The volume of a sphere is 4/3 * pi * r^3, where r is the radius of the balloon.  
 
# The volume of a sphere is 4/3 * pi * r^3, where r is the radius of the balloon.  
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   ((4/3) * pi * (r^3) * 28.2) / 448 = lift in pounds
 
   ((4/3) * pi * (r^3) * 28.2) / 448 = lift in pounds
  
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== Flip Video Camera ==
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Aprox 150g total weight  = 94g body + 50g batteries (2-AA)
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== hydrogen ==
 +
 +
Reactions:
 +
# Sodium hydroxide + Aluminum
 +
#Hydrochloric acid + Zinc
 +
# Calcium hydride and water (See "Hydrogen Generator ML-303/TM and Hydrogen Generator Set AN/TMQ-3", January 1, 1990, Publisher: Departments of the Army and Air Force)
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[http://www.pilotballoon.com/hydsafty.htm Pilot Balloons Hydrogen Safety]
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== helium supplies SF ==
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=== Party Warehouse ===
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28 Westlake Ave, Daly City, CA
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<b>THE MAP IS INCORRECT. IT IS A FEW BLOCKS SOUTH IN THE WESTLAKE MALL.</b>
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http://maps.google.com/maps?f=q&hl=en&geocode=&q=28+Westlake+Ave,+Daly+City,+CA&sll=37.0625,-95.677068&sspn=79.379181,85.429688&ie=UTF8&ll=37.6999,-122.464256&spn=0.010068,0.010428&z=16&iwloc=addr
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(650) 992-5570
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rental $10 - 25 balloons
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rental $20 - 72 balloons
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disposable $30 - 50 balloons
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<b>We were pretty happy with this place. The prices were cheap.</b>
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=== Party City: Daly City‎ ===
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317 Gellert Blvd, Daly City, CA
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(650) 756-0215‎ -
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disposable 30 balloon tank $30
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disposable 50 balloon tank $35
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== Balloon suppliers ==
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http://kaymontballoons.com/
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http://www.scientificsales.com/
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http://www.novalynx.com/400-balloons.html
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== payload computers ==
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=== Phidgets ===
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http://www.phidgets.com/
  
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They sell a rather expensive pressure sensor ($50), but it looks like it might be easy to interface [http://www.phidgets.com/products.php?product_id=1115 1115 Pressure Sensor]. It plugs into the analog input of the Phidget Interface kit (Phidgets: 1018, 1202 or 1203). It measures absolute pressure 20 to 250 kPa (2.9 to 36.3 psi). This means it's probably not much good above 35000 feet.
  
 
== S60 control ==
 
== S60 control ==
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=== Send an SMS with S60 ===
 
=== 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
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This stuff looks trivial. This could be a very viable downlink. http://wiki.forum.nokia.com/index.php/How_to_send_SMS
  
 
  import messaging
 
  import messaging
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</table>
 
</table>
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== See also ==
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[http://www.pilotballoon.com/ Pilot Balloon Observation Theodolites]

Latest revision as of 11:00, 15 October 2013


AirFish or Air Fish

Basecamp

The project management is through AirFish Basecamp


weight of line to estimate length

I let the balloon go nearly 90 degrees vertical up. I didn't know the length of the line. When I pulled it back in I weighed the line at 35.75 g. I figured that later I could weigh pieces of known lengths of the line to estimate the total length.

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

Aprox 150g total weight = 94g body + 50g batteries (2-AA)

hydrogen

Reactions:

  1. Sodium hydroxide + Aluminum
  2. Hydrochloric acid + Zinc
  3. Calcium hydride and water (See "Hydrogen Generator ML-303/TM and Hydrogen Generator Set AN/TMQ-3", January 1, 1990, Publisher: Departments of the Army and Air Force)

Pilot Balloons Hydrogen Safety

helium supplies SF

Party Warehouse

28 Westlake Ave, Daly City, CA THE MAP IS INCORRECT. IT IS A FEW BLOCKS SOUTH IN THE WESTLAKE MALL. http://maps.google.com/maps?f=q&hl=en&geocode=&q=28+Westlake+Ave,+Daly+City,+CA&sll=37.0625,-95.677068&sspn=79.379181,85.429688&ie=UTF8&ll=37.6999,-122.464256&spn=0.010068,0.010428&z=16&iwloc=addr (650) 992-5570

rental $10 - 25 balloons rental $20 - 72 balloons disposable $30 - 50 balloons

We were pretty happy with this place. The prices were cheap.

Party City: Daly City‎

317 Gellert Blvd, Daly City, CA (650) 756-0215‎ -

disposable 30 balloon tank $30 disposable 50 balloon tank $35

Balloon suppliers

http://kaymontballoons.com/

http://www.scientificsales.com/

http://www.novalynx.com/400-balloons.html

payload computers

Phidgets

http://www.phidgets.com/

They sell a rather expensive pressure sensor ($50), but it looks like it might be easy to interface 1115 Pressure Sensor. It plugs into the analog input of the Phidget Interface kit (Phidgets: 1018, 1202 or 1203). It measures absolute pressure 20 to 250 kPa (2.9 to 36.3 psi). This means it's probably not much good above 35000 feet.

S60 control

Send an SMS with S60

This stuff 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')

pyspy

http://sourceforge.net/projects/pyspy http://www.symbian-freak.com/forum/viewtopic.php?t=15756

Pressure versus Altitude

See also Boyle's Law.

volume of helium at altitudes.

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

See also

Pilot Balloon Observation Theodolites