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Preliminary Design Review Presentation
California State University, Long Beach November 8th, 2016
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Main and Propulsion Bay
Vehicle dimensions Section Length (in) Nose cone & Payload Bay 30 CO2 Ejection System 8 Drogue Bay 10 Avionics Bay 12 Main and Propulsion Bay 48
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Vehicle materials ABS Bluetube Aluminum
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Vehicle Justifications
ABS vs. PLA Bluetube, carbon fiber, or fiberglass
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Static Stability Margins
CG – in CP – 79.50
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Preliminary Motor Selection
Aerotech L1170FJ-P Total Impulse (lbf.s) 947 Avg. Thrust (lbf) 271 Max Thrust (lbf) 331 Burn time (s) 3.49 Launch Mass (oz) 176 Empty Mass (oz) 77.2
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Thrust to Weight and Rail exit velocity
T/W = 9 Vexit = 76.1 ft/s
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Maximum Altitude (feet)
Avionics Subsystem Dimensions Maximum Altitude (feet) Weight (grams) Perfectflite StratoLoggerCF 2″ × 0.84″ × 0.5″ 100,000 10.8 Missleworks RRC2+ 2.28″ × 0.925″ × 0.5″ 40,000 10 Featherweight Raven 3 1.8″ × 0.8″ × 0.56″ 7 StratoLoggerCF Altimeter Data: altitude, temperature, battery voltage Reliable and low cost Team member experience
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Avionics Subsystem BigRedBee BRR900 GPS tracker and logger
LCD receiver displays GPS coordinates No HAM license required Versatile and practical
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Avionics Bay 6” diameter coupler U-bolts (1,075 lb test)
Rotary switch as arming switch Primary and Backup altimeters BRB900 GPS tracker
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Parachute Sizing Drogue Parachute: 24” Classic Elliptical
Main Parachute: 72” Iris Ultra Drogue Descent Velocity: ~80 fps Main Descent Velocity: ~22 fps
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Drift Calculations Case 1
Launch vehicle is descending under main with payload still attached Drogue deployment: 5,280 feet Main deployment: 500 feet Maximum drift: ~2,420 feet With PAYLOAD Attached Wind Speed (mph) Wind Speed (fps) Drogue Drift (ft) Main Drift (ft) TOTAL DRIFT (ft) 0.00 5 7.33 438.17 166.67 604.83 10 14.67 876.33 333.33 15 22.00 500.00 20 29.33 666.67
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Drift Calculations Case 2
Main chute deploys at 500 feet, payload detaches at 400 feet Drogue deployment: 5,280 feet Main deployment: 500 feet Payload deployment: 400 feet Maximum drift: ~2,445 feet With PAYLOAD Detached Wind Speed (mph) Wind Speed (fps) Drogue Drift (ft) Main Drift when dropping from 500ft to 400ft (ft) Main Drift when dropping from 400ft to GROUND (ft) TOTAL DRIFT (ft) 0.00 5 7.33 438.17 33.33 139.68 611.18 10 14.67 876.33 66.67 279.37 15 22.00 100.00 419.05 20 29.33 133.33 558.73
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Mission Sequence
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Preliminary Payload Design
Autonomous Powered Paraglider 3D Printed Nose Cone Mechatronic Nose Cone Opening System Pi Camera
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Autonomous Powered Paraglider
DC Motor and Propeller Servo and flybar Pixhawk flight controller
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Hinge and linkage mount
3D Printed Nose Cone 3 Sections Elliptical shape Hinge and linkage mount
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Mechatronic System Stepper motor and nut Linkages and hinge
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Pi Camera FOV Spatial Resolution of Targets OpenCV
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Requirement Compliance Plan
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Safety Safety Manual: Safety Officer: Risk Assessment Matrix:
Rules & Regulations Lab & Machine Shop Educational Engagement Safety Safety Contract signed by all team members PPE MSDS Launch Safety Safety Officer: Ensure compliance of all rules and regulations Frequent and anonymous safety Inspections Update Safety Manual Update Risk Assessment Risk Assessment Matrix: Machine Shop / Lab Risks Pre-launch / Launch Risks Recovery Risks Environmental Hazard Risks Structure and Propulsion Risks Payload Risks Payload Deployment Risks Project Risks
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