Team Six-PackLaunch Readiness Review

Calder Lane, Courtney Ballard, Ian Thom, Thomas Green, Matt Cirbo, Janelle Montoya

11/1/11

Fall 2011

Rev A

08-16-11

Mission Overview

BalloonSat Helios measures

the efficiency of wireless

energy transmission

using a laser and

solar panels.

Design Overview

Two Foam Core Structures

Top Circuit:

Nine solar panels

3.3 volt Li-ion

50 mW red laser

Bottom Circuit:

One solar panel

Attopilot current and voltage sensor

Arduino Uno and SD shield.

Cold Test

0 1000 2000 3000 4000 5000 60000

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

0.45

Cold Test Voltage

Voltage

Time (seconds)

Vo

ltag

e (V

olt

s)

1 2 3

Sun-Laser Comparison Test

0 5 10 15 20 25 30 350.36

0.3650.37

0.3750.38

0.3850.39

0.3950.4

0.4050.41

Voltage with and without Laser

Voltage

Time (seconds)

Vo

ltag

e (V

olt

s) 2

3 1

HOBO Test

0 1000 2000 3000 4000 5000 6000 7000 8000 9000

-20

-10

0

10

20

30

40

Cold Test HOBO Temperature Readings

InternalExternal

Time (Seconds)

Tem

pera

ture

(°C

)

1 2

4 3

Camera Test

Camera worked, took over 600 pictures in two

hours.

Whip and Drag Tests

Whipped at about a two foot length to simulate flight

string motion.

Satellite dragged as a more accurate test of

the satellite’s predicted landing behavior.

Drop Test

Satellite dropped from second story to attain a speed of about 20 m/s.

Expected Results

• Cold test: More voltage as fog cleared–More laser light hitting panel

• Expect similar results on flight–Less atmosphere means better

transmission.

Biggest Worries

• Resolving amperage issue• Final assembly

Requirements

Weight: Under 850g? -> Negotiated for 50g extra -> Under 900g? Yes

Cost: Under $250? Yes

Able to record 90 minutes of data? Yes

Remains intact? Yes

Measures efficiency of laser transfer of energy? Yes

Temperature remains above 10°C? Yes

HOBO works? Yes

Camera works? Yes