# Difference between revisions of "AirFish"

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)

## 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

### Phidgets

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')