1. Echo  Final Presentation Andrew Berg, Shawn Carroll, Cody Humbargar, Jade Nelson, Jared Russell, Austin Williamson 12-05-06

2. Mission Overview Main Science Mission- Test the effect of air pressure on sound waves. Compare sounding data to EOSS pressure data. Secondary Science Mission- HOBO data logger used to measure internal and external temperature during flight HOBO also used to test humidity levels inside balloon-satellite. Non-Science Mission- Using main imaging hardware to take photographs during flight. Secondary imaging hardware will using ultraviolet / infrared filters to take photographs.

3. Design Balloon satellite measuring 150mm x 145mm x 100mm. Cameras face same direction -Primary ELF -Secondary 35mm IR Photography Main science system will be shock mounted Compact internal arrangement Atmospheric venting through desiccant

5. Design Pictures

6. RFP Satisfaction  Payload will be ready to fly by the end of the week  Mass and financial budget were not exceeded  Other RFP requirements met

7. Results and Analysis Expected Results –Linear correlation –Possible correlation with temperature Data Analysis –EOSS Pressure Data –Derived pressure based on altitude (General Case) –Running average of voltage data

9. Data Conclusions Definite Correlation, but not linear as expected. More trials (launches) are needed to reach more specific conclusions. -Data could be inaccurate due to equalization lag -Need accurate pressure sensor Sources of error -Equalization lag -Pressure sensor accuracy

10. Flight Statistics Max ascent rate: 1501.313 ft/min Max descent rate: 9944.23 ft/min Launch: 7:28:47 11/11/2006 Landing: 9:54:17 11/11/2006 Max altitude: 98832.02 ft at 9:23:17

11. Ready To Fly Again  Final preflight too complicated -Camera power on main switch -Resolve film issues  Camera failure due to battery enclosure -Fixed battery enclosure -Could switch timer relay to DPST  Low peak voltage at sensor -Modified sound tube

12. Sound Experiment Experiment As FlownModified Experiment

13. Round Two Pre-Flight Store the payload,closed, in a cool, dry place Replace Consumables -Modify IR film canister -Clean IR filter Activation -Power on cameras -Set flash -Activate timing circuit

14. Conclusions The correlation between sound transmission and pressure could be linear, but additional flights are needed for surety. Given the data, sound does not conduct as well at higher altitudes compared to lower altitudes.

15. Lessons Learned  All parts of the craft need equal attention  Activation should not require the craft to be open  Tape is ineffective in near-space

16. Message To Next Semester  Don’t be afraid to ask for help  Take your problems one at a time  Keep your experiment simple, but try something challenging  Test thoroughly  Leave plenty of time for problems