Operation Defeat Icarus
By
Jake Messner
Objective: Launch a payload to the edge
of space to take photographs and measure radiation, temperature, and pressure.
Materials:
Weather Balloon: We will use a 5’
diameter weather balloon that will expand to a 20’ diameter in the upper
atmosphere due to decreasing air pressure.
iPhone 4
Software: Frontback, duocam, intercam
We
will perform tests regarding battery life and will need photography
software.
GPS software
Thermometer
Pressure and Altitude Sensor
Arduino Microcontroller
Noise Device
Payload basket
Nylon Rope
Helium tank(s)
We will need ~75 cu ft of helium.
Parachute
External iPhone Battery
An external battery will ensure that the iPhone battery survives through the entire flight and gives us additional time to locate the device once it has landed. Batteries cost ~$3 for 2200mAh.
Chemical Hand Warmers
Aluminum Foil Radar Reflectors
Intro: In 2009, MIT students launched a
weather balloon to 93,000 feet and photographed the Earth from the edge of
space. We set out to reduce the cost of this project and add a radiation
detector, thermometer, altimeter, and barometer to the payload. While the cost
of our weather balloon and helium will be similar, we can reduce the cost of
the electronics by using a device including both camera and GPS. We will use a
GPS operating via cellular signal rather than satellite such that we will be
able to locate the device whether or not it has an unobscured view of the sky. By
adding a thermometer to the payload, within view of the camera, we will be able
to track changes in temperature over time as the balloon rises. We expect the
balloon to reach the upper stratosphere before popping due to low air density.
In the event that the balloon does not pop and is neutrally buoyant, resulting
from low air density, we will activate a popping mechanism.
In
compliance with FAA regulations, the balloon will have a payload weighing less
than four pounds, be less than six feet in diameter, be launched more than 15
miles from an airport, and have a tension of less than 50 pounds to disconnect
the payload.
In keeping
with the spirit set by MIT students Oliver Yeh, Justin Lee, and Eric Newton, we will document our spending as the
project progresses with the ultimate goal of spending less than $148 on components used in the final project.
Launch
Location: The balloon will
be launched from Saratoga Performing Arts Center in Saratoga Springs, NY. This site will allow for a large radius of area with strong cell coverage.
Weather: While winds aloft in New York State blow
west to east most frequently, the optimal launch conditions are in a northwest wind aloft.
Recovery:
We will not launch in a strong south wind due to the potential of flying into
Canadian airspace.
In order to locate the balloon, we will
include an iPhone equipped with GPS tracking software in the payload. This
software should pin the location of the device to within approximately ten
meters. We will additionally include an auditory alarm, in case the GPS cannot
locate the device with sufficient accuracy. The iPhone (4) will be fitted with
a microSIM card and will therefore require cellular service to broadcast a signal. Cellular service via AT&T can be seen on the map below.
Photos/Video and Battery Life: Data options include taking photos
at scheduled intervals or recording video for the duration of the flight. The
options would be equally stressful on the battery life of the iPhone, although
recording video may fill the Phone’s 8GB of memory before the flight is over.
The iPhone’s battery life is 131 minutes while recording
video on standard settings. By writing out own application, we will dim the
screen while taking video and likely save 10-15% of the battery life,
increasing the life expectancy to at least 144 minutes. Previous near-space
photography flights have lasted from 100 minutes to 240 minutes. We intend to
design a light capsule and use sufficient helium to keep the expected flight
time under 120 minutes. By adding an external iPhone battery, we should be able
to increase the life of the battery by at least 80%, creating a new life
expectancy of at least 260 minutes. Depending on how much the battery life is
hindered by the temperatures experienced during the flight, this expectancy
should allow for 30 to 140 minutes to search for the capsule once it has landed.
Freezer Test:
iPhone was placed in freezer with PMC battery plugged in and battery at 22%.
Phone charged to 45% before shutting off due to the cold. After being removed
from freezer after 60 minutes, phone turned on in 4 minutes. Charger lights
remained on through entire test, apparently unaffected by cold.
After two months of research, drawing, and assembly, we are prepared to launch our balloon on October 6, 2013.
After two months of research, drawing, and assembly, we are prepared to launch our balloon on October 6, 2013.
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