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Pre-Flight Briefing ANSR-79

Pre-Flight Briefing ANSR-79. Team Members. Pima Community College 3/28/14. Nick Patzke Gustavo Guerreo Nick Morris. Why can’t we successfully fly a GoPro camera through space in a “naked” state?. Payload Motivation.

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Pre-Flight Briefing ANSR-79

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  1. Pre-Flight Briefing ANSR-79 Team Members • Pima Community College • 3/28/14 • Nick Patzke • Gustavo Guerreo • Nick Morris

  2. Why can’t we successfully fly a GoPro camera through space in a “naked” state?

  3. Payload Motivation • Payloads used in ANSR balloon flights are subjected to temperatures as low -60C which usually require additional heating and insulation. • This results in limited mounting configurations, additional weight and take up space better served for circuit boards, etc. • Most ANSR payloads have some form of camera (still or video), that generally require special attention. • Most payload camera failures are the result of battery “failure” at extreme temperatures. • GoPro technical staff have no data on their cameras and their behavior at low temperatures. • The goal for this flight is to examine GoPro camera behavior during an ANSR flight.

  4. Payload Objectives • Build a simple payload holding two GoPro cameras aimed at answering questions about their usability in extreme conditions. • Lamp-rod Configuration: • One GoPro with OEM battery as a control ‘group.’ • Another GoPro powered by a larger capacity and voltage battery. • (LiPo 11.1v 3S 2250 mAh) 5V Regulator GoPro 2 GoPro 3

  5. GoPro Issues In Space • The Battery • Li-Ion batteries shipped with GoPro cameras today are specified to have a minimum operating temperature of -40 C • For most applications, this limit is far lower than the camera or battery will ever experience. • But we want to send them into near space and back…(min expected temp ~-60C) • But Why Can’t a Battery Operate at < -40C ? • A batteries’ internal resistance increases as temperature decreases: • As internal resistance increases, load voltage decreases: • As load voltage decreases, available current decreases: • At some point (due to the cold) the available currentshould decrease past the necessary 0.5A needed and the camera will shut off.  • Or the remote possibility of a defective battery…

  6. Payload Structure • Both GoPros (in their protective cases) will be exposed equally to the elements: • One with stock battery. (Li-Ion) • Facing balloon. • One with a larger Li-Po battery • Facing toward Earth.

  7. Battery Testing Test Box Lab

  8. Acknowledgements • Special thanks to the following for offering this opportunity!: • Jack Crabtree and ANSR • Susan Brew and NASA Space Grant • Mike Sampogna • Dr. Denise Meeks

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