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CONCEPTUAL Design Review

Metropolitan State University Isaac Hamilton Jordan Gallegos Christopher Olson McMillan Miskin Daniel Koch Thomas Mindenhall Cody Overcash March 27, 2009. CONCEPTUAL Design Review. Outline. Mission Overview Payload Compliance Payload Design Balloon Interface Heating System

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CONCEPTUAL Design Review

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  1. Metropolitan State University Isaac Hamilton Jordan Gallegos Christopher Olson McMillan Miskin Daniel Koch Thomas Mindenhall Cody Overcash March 27, 2009 CONCEPTUAL Design Review

  2. Outline Mission Overview Payload Compliance Payload Design Balloon Interface Heating System Camera System Accelerometer System Structural and Thermal Properties Testing and Results Price List

  3. Mission Overview • Our objective is to send a weather balloon with a payload to an altitude of one hundred thousand feet. It will capture still photographs and record acceleration forces during the three-hour flight as well as subsequent impact with the ground. • The team expects to meet all objectives while maintaining a budget of eight hundred dollars. • Amateur high altitude weather balloons are becoming more popular. Many people have used weather balloons to obtain dust samples and also to take aerial photography from the edge of space.

  4. Payload User Guide Compliance • Mass- 1.5 kg (Total Payload) • Payload mass is 1.368kg • Determination of G-loads upon landing • Accelerometer is capable of measuring 3 G’s at a rate of 1 sample every 0.6 seconds totaling 18000 measurements during the flight • On-board photography during entire flight • Cameras will take 1000 pictures over the duration of the flight • Balloon Interface • Payload attaches through strong center pipe that holds the whole system together

  5. Payload Design Clamping tube Outward faced camera Accelerometer Top Base Heating resistors Downward faced camera Middle section Base

  6. Balloon Interface Lock nut Tether PVC tube Payload top

  7. Heating System Heating Resistors 9 volt Batteries

  8. 33 ohm resistors 9 volt Wiring Diagram for Resistor Heater 9 volt 9 volt

  9. Camera System We will be using two Canon A570IS cameras to take pictures throughout the flight. The A570IS camera takes pictures at 7.1MP. The cameras are currently both running a script via CHDK to take pictures at intervals of 10 seconds for the entire flight (4GB card, max 4mb/picture, estimated 3 hr flight). The interval script has been tested and it is running fine. Shutter speed will be adjusted to a fast setting via CHDK assuming there are no conflicts between doing this and running the interval script. Further camera testing will be done between 3/26/2009 and 3/29/2009 to make sure a faster shutter speed and the interval script work. If they are not compatible a default shutter speed will be used.

  10. Accelerometer System During our flight we will be recording the flight with a Hobo Pendant G 3-axis accelerometer. The Hobo Pendant G can log 21,333 times when logging all three axis. To spread out logging throughout the 3 hour estimated flight we could log every 0.506 seconds. To error on the side of caution the Hobo will be set to log every 0.6 seconds. The maximum G force rating on the Hobo is +/-3G. Unfortunately this may not be enough to record accurately on landing and if we were to have another launch we would look into other accelerometer options. The temperature in the sat must be kept above -20C in order to stay within the Hobo’s operating range.

  11. MK111 Timing Circuit

  12. Structure and Thermal Properties Carbon and coremate reinforcement 5.7 oz 3k carbon fiber square weave Polystyrene core 0.023 W/m *K Tin min= 0°C Tout = -60°C

  13. Testing Thermal testing in -50° F environment Thermal couples placed on the inside and outside of payload. Test environment Test vessel

  14. Test Results Test failure point

  15. Price/Mass List Price list Mass list

  16. Team Member Responsibilities • Daniel Koch-Exterior Structure, Composite Material handling and thermal properties • Jordan Gallegos-Structural design oversight handling • McMillan Misken-Payload construction • Christopher Olson-Internal Heating assembly • Cody Overcash-visual recording assembly and accelerometer assembly • Isaac Hamilton-Still Photo recording and wiring assembly. Interior shell construction and assembly • Thomas Mindenhall-Interior structural assembly

  17. Upcoming Schedule • March 27th CDR • March 28th - April 9th construct new heater and retest • Launch April 11th

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