Echo  Critical Design Review Andrew Berg, Shawn Carroll, Cody Humbargar, Jade Nelson, Jared Russell, Austin Williamson

Mission Overview Main Science Mission- Test the effect of air pressure on sound waves. Using the sounding device for a comparison to secondary science mission as a flight recorder. 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. Temperature readings from HOBO data logger will act as a black box during mission. Non-Science Mission- Using main imaging hardware to take photographs during flight. Secondary imaging hardware will using ultraviolet / infrared filters to take photographs. Photographs from main and secondary imaging hardware will be used for comparison. Objective: Using Echo  ’s science systems to show a direct correlation between the amplitude of a sound wave to the pressure of the air it passes through.

Design Balloon satellite measuring 10 by 12cm. Optics will require cameras to be mounted facing in the same direction. Main science system will be isolated via a tube suspended by tension springs to prevent vibration and shock. Secondary science system and other systems will be tightly arranged to minimize contact with vacuum at 100,000ft, optimal use of heating system, and to minimize wiring needed. Atmospheric control system consists of a tube system that moderates airflow and removes humidity by venting atmosphere into space.

Design Heater Power Heater 1 (To Heater 2) (To Heater 3) Switch Timer Power Timer Camera 1 Camera 1 Power Camera 2 Camera 2 Power Switch Microphone power Microphone/Preamp Rectifier/filter Op-Amp HOBO HOBO Power External TemperatureRelative Humidity Internal Temperature Sounding Device Sounding Device Power Switch

Design Hardware-

Design Two Cameras 55x87x35 mm Timing Circuit 40x58x22 mm Sounding Equipment 50x30x15 mm Heater 38x44x22mm Box 10x10x12cm

Management Project Schedule Personnel and Division of Labor

Budget

Testing Plan 1. HOBO Testing 2. Sound Equipment Testing 3. Structural Testing (Shock, Drag, and Whip) 4. Optics Testing 5. Integration Testing