S.H.I.E.L.D.CRITICAL DESIGN REVIEW

Addison, Travis, Jared, Evan, Aaron, Matt10/14/08

To See the Stars Mission Overview

Take video of the Stars becoming Visible during the Ascent. Also record during entire Flight to record the Descent as well

We plan to discover the feasibility of using balloon based Imaging platforms over low orbit Telescopes.

We suspect that once above 11km visibility of the stars will increase greatly

We wish to see Astronomical observations with quality similar to low orbiting telescopes, but at a fraction of the cost.

We hope to show that such Balloonsat observations can be taken regardless of time of day (similar to low orbit telescopes)

Answer the question, why are you doing this mission?

How to Achieve our Goals Requirements Flow Down

G1: The S.H.I.E.L.D. BalloonSat’s purpose is to attain an altitude of at least 11 kilometers in order to determine the altitude at which atmospheric disturbance becomes negligible and stars become visible using as CCD camera. The purpose of this mission is to use this information to show that it’s possible to obtain pictures of quality similar to an orbiting space telescope, and far better than ground based observations. We also wish to compare various structural designs, in the hopes of finding a structure that works better than others such that the BalloonSat is reusable. O1: Maintain a clear view of the sky during the entire flight.

O2: Using a CCD Imager we will obtain video of the ascent to 30km.O3: A Cannon Camera will provide backup pictures to compare picture Quality.O4: Our Balloonsat will have a Unique design to test out.O5: The Camera’s and equipment will be secured in order to survive the burst and descent.

The Specifications We Shall conduct an Experiment to gather Scientific data

Video Recordings of the Stars becoming gradually more visible during the Ascent Due to the cold temperatures during flight our design includes a Heater to keep the electronics warm

Balloonsat shall survive flight and be ready to fly again By using a sound design, and many tests we will ensure our Balloonsat will survive the forces it will

experience during the flight The Balloonsat will stay within 1kg of mass

We’ve weighed all our components and hardware to ensure the weight is within limits Anything we are not Sure of on the weight we’ve overestimated so that the actually design will be

under Including all the Required Hardware

We have included a HOBO, a Cannon Camera, and an External Temperature sensor in the design The Balloonsat will be made of Foam Core as per specifications Design includes Tubing for connection to the Flight String

Ready to fly by Launch Date Rigorous testing (Various Structure Tests, at least one Cold Test, and Function Tests) Keeping to Schedule so that Final Design is completed and Ready by Nov. 15th for Luanch

The Build Design

Our BalloonSat is taking the Form of a Dodecahedron We believe this shape will add Structural Integrity We hope this Shape will prove more Aerodynamic than

others Volume to Surface Area ratio is better than other

Shapes.Power Switch Heater

HOBO

Relative Humidity Sensor

Internal Temperature

Sensor

Internal

External Temp. Sensor

Port 1Cannon Camera

Power

Switch

Memory CardPower

Switch CCD Camera

Device Recorder

Pressure HOBO

Pressure GaugeInternal

PartsHardware Acquisition Status Heater with switch and 3 9V batteries Acquired

Switches (2) Acquired

HOBO Acquired

Pressure HOBO Acquired

External temperature sensor Acquired

Aluminum tape (15.5cm x 4.8cm) Acquired

Hot Glue (by the stick) Acquired

Plastic tube Acquired

Cannon Camera with batteries Acquired

CCD camera with batteries Researching

Foam core Acquired

Flag Acquired

Insulation Acquired

Plexiglas panel Ordered

video recorder Researching

Aluminum support Ordered

Hardware Quantity Cost Weight Heater with switch and 3 9V

batteries 1 Provided by Space Grant 175 grams

Switches 2 Provided by Space Grant 11.6 grams

HOBO 1 Provided by Space Grant 26.2 grams

Pressure HOBO 1 Provided by Space Grant 25.5 grams

External temperature sensor 1 Provided by Space Grant 9.3 grams

Aluminum tape (15.5cm x 4.8cm) 25 Provided by Space Grant 45 grams

Hot Glue (by the stick) 10 Provided by Space Grant 39 grams

Plastic tube 1 Provided by Space Grant 18.2 grams

Cannon Camera with batteries 1 Provided by Space Grant 220 grams

CCD camera with batteries and video recorder

1 $125 150 grams

Foam core (Pentagons of edge length 8.5 cm)

11 Provided by Space Grant 90 grams

Flag 1 Provided by Space Grant 1 grams

Insulation (Pentagons of edge length 8cm)

11 Provided by Space Grant 48 grams

Plexiglas panel 1 Provided by Space Grant 25 grams

Aluminum support 1 Provided by Space Grant 50 grams

Totals $ 125 935.2 grams

Testing, 1,2,3… Test Plan

We Plan to use variety of tests to test Structure, Function, and ability to stand the Cold Structure Tests

Drop Test Stair Test Whip Test

Function Tests Independent Components Interconnected Components One additional Function test during cold test

Cold Test Testing the Internal Temperature while Balloonsat is put in a

very cold (~ -60C)

The Aftermath… Structure Tests

We expect the Dodecahedron to survive the tests rather well, and little or no rebuilding will be required

Function Tests We expect that we will have to perform multiple

function tests to ensure all Components work together

Cold Test This is one of our biggest Worries, but we hope that

by making the volume just right One heater and Insulation will keep the Balloonsat warm.

Geronimo! Biggest Worries…

Size Issues Fitting all Components inside the Sat. without making

the Volume too large Cold Test

One Heater keeping the Components warm Time

Meeting all the time constraints (~30 days to Launch!) Scheduling

Getting our entire Team together for Regular Meetings