Piedmont Student Launch Team Critical Design Review 19 January 2017 Piedmont Student Launch Team Piedmont Virginia Community College
Overview • Design overview • Payload design • Launch vehicle design • Payload integration • Launch and flight statistics • Interfaces • Recovery system and landing • Status of requirements statistics verification • Test plans and procedures • Q&A • Subscale flight results Piedmont Student Launch Team 2 Piedmont Virginia Community College
Rodney Davis DESIGN OVERVIEW Piedmont Student Launch Team 3 Piedmont Virginia Community College
Design Overview - Final Launch Vehicle Statistics • Diameter: 5.5 in • Fin span: 20.3 in • Height: 108.8 in • Center of gravity before Burnout: 66.7 in from nose cone • Center of gravity after Burnout: 63.6 in from nose cone • Center of Pressure: 78.6 in from nose cone • Static stability margin: 2.26 Piedmont Student Launch Team 4 Piedmont Virginia Community College
Design Overview – Mass and Mass Margin System Mass (lbs) Mass Margin (lbs) Overall 29.77 +1.375, -1.5 Upper section 4.53 ±0.39 Avionics bay 4.57 ±0.03 Lower section 7.53 ±0.95 Ballast 2.00 ±0 Nose cone 2.59 ±0 Motor mount 1.77 ±0.48 Bulkheads (each) 0.39 ±0.2 Upper body tube 3.85 ±0 Lower body tube 3.15 ±0 Motor tube 1.03 ±0.02 Piedmont Student Launch Team 5 Piedmont Virginia Community College
Design Overview – Mass and Mass Margin ( con’t ) System Mass (lbs) Mass Margin (lbs) Recovery harness (each, with swivels and quick 1.22 ±0.04 links) Parachutes (both) 1.60 ±0.3 Avionics bay tube 1.86 ±0 Avionics sled, mounting hardware, and altimeter 0.64 ±0 Fins (each) 0.70 ±0.07 Tail cone 0.44 ±0.1 Centering rings (each) 0.14 ±0.15 Motor 8.10 ±0 Piedmont Student Launch Team 6 Piedmont Virginia Community College
Design Overview - Final Payload Statistics • Overall – Mass: 3.5 lbs – Length: 12 in • Reaction wheel – Mass: 1.5 lbs – Length: 1.5 in – Diameter: 4.5 in Piedmont Student Launch Team 7 Piedmont Virginia Community College
Rodney Davis LAUNCH VEHICLE DESIGN Piedmont Student Launch Team 8 Piedmont Virginia Community College
Launch Vehicle Design - Key Design Features • Altitude control: ballasting • Drogue parachute size: 18 in • Main material: fiberglass • Ejection charge size: 1.6 g drogue, 2.8 g main • Number of shear pins per • Recovery harness attachment: section: 4 quick links and swivels • Length of recovery harness • Attachment points per sections: 27 ft section: 2 • Rail button size: 1515 • Main parachute size: 84 in Piedmont Student Launch Team 9 Piedmont Virginia Community College
Launch Vehicle Design - Upper Section Piedmont Student Launch Team 10 Piedmont Virginia Community College
Launch Vehicle Design - Avionics Bay Piedmont Student Launch Team 11 Piedmont Virginia Community College
Launch Vehicle Design - Lower Section Piedmont Student Launch Team 12 Piedmont Virginia Community College
Launch Vehicle Design - Full Rocket Piedmont Student Launch Team 13 Piedmont Virginia Community College
Launch Vehicle Design - Final Motor Choice • Aerotech L1150R-P Piedmont Student Launch Team 14 Piedmont Virginia Community College
Daniel Hull STATISTICS Piedmont Student Launch Team 15 Piedmont Virginia Community College
Launch Statistics • Thrust-to-Weight at rail exit: 7.6:1 • Rail Exit Velocity: 71 ft/s • Rail Exit Time: 0.385 s Piedmont Student Launch Team 16 Piedmont Virginia Community College
Flight Statistics • Stability Margin at Launch: 2.26 Piedmont Student Launch Team Piedmont Virginia Community College
Recovery System • Parachutes • Descent Rates – Main: 84 in – Under Drogue: 112 ft/s – Drogue: 18 in – Under Main: 18.8 ft/s • Recovery Harnesses – Type: Tubular Kevlar – Length: 27 ft – Size: 1/2 in Piedmont Student Launch Team Piedmont Virginia Community College
Kinetic Energy Main Deployment Section Kinetic Energy (ft-lbf) Upper 875 Avionics Bay 883 Lower 1455 Landing Section Kinetic Energy (ft-lbf) Upper 24.9 Avionics Bay 25.1 Lower 41.4 Piedmont Student Launch Team Piedmont Virginia Community College
Drift Predictions Wind Speed (MPH) Drift (ft) 5 515 10 1030 15 1545 20 2060 Wind Speed (MPH) Drift (ft) 5 171 10 352 15 526 20 708 Piedmont Student Launch Team Piedmont Virginia Community College
Andrew Oxford TEST PLANS AND PROCEDURES Piedmont Student Launch Team 21 Piedmont Virginia Community College
Test Plans and Procedures • Structure Testing • Software Testing – Push / Pull tests – Done • Data collection • Experiment Testing • Data transmission – Push / Pull tests – To Do – Electronics Tests • Range • Mounting • Target identification • Recovery System Ground Fire • Reaction wheel control • Simulations Piedmont Student Launch Team 22 Piedmont Virginia Community College
Test Plans and Procedures – Recovery System • Electronics – Altimeter tests – Mounting • Recovery Harness – Pull tests • Parachutes – Deployment Piedmont Student Launch Team 23 Piedmont Virginia Community College
Nicolas Gutkowski SUBSCALE TEST FLIGHT Piedmont Student Launch Team 24 Piedmont Virginia Community College
Subscale Test Flight • 73% Scale airframe • Dual deploy • Redundant altimeters • Full payload electronics • 29% Scale mass reaction wheel • J250 Motor Piedmont Student Launch Team Piedmont Virginia Community College
Subscale Test Flight - Failure • Motor failure at T+0.767s • Motor failure caused motor to be ejected from rocket • Altimeters did not reach arming altitude – Parachute did not deploy Piedmont Student Launch Team Piedmont Virginia Community College
Subscale Test Flight – Recovered Data • Rail Exit Velocity: 46 ft/s • Flight Length: 9.5 s • Angle at Rail Exit: <5° • Anomaly Altitude: 42 ft • Apogee: 154 ft Piedmont Student Launch Team Piedmont Virginia Community College
Sander Abraham PAYLOAD DESIGN Piedmont Student Launch Team 28 Piedmont Virginia Community College
Payload Design - Final Payload Overview • Similar Design as PDR – Subscale had minor changes to accommodate the size – The motor was moved to the bottom • Different sensor package Piedmont Student Launch Team 29 Piedmont Virginia Community College
Payload Design – Reaction Wheels • Subscale Reaction Wheel: – Made up of two wooden disks with bolts going through, and four nuts per bolt to add mass – Mass: 0.44 lbs • Full Scale Reaction Wheel: – Same design with fiberglass – Mass: 1.5 lbs Piedmont Student Launch Team 30 Piedmont Virginia Community College
Payload Design - Experiment Electronics • Each part is set on top of standoff screws • Parts List: – Raspberry Pi 3 B+ – Xbee Pro 900 HP – Adafruit Ultimate GPS – AltIMU-10 Piedmont Student Launch Team 31 Piedmont Virginia Community College
Payload Design - Experiment Electronics (cont.) • Parts List: – Battery Pack (6xAA) – 5v Step Down Converter (UBEC) – 2x A23 Batteries – MD10C R3 Motor Controller Piedmont Student Launch Team 32 Piedmont Virginia Community College
Payload Integration • The base of the payload sits 41.85 in from the nose cone • A coupler section acts as a rest for the payload to sit on • The payload is kept in place by rivets • The camera has a back plate that is attached to the inside of the upper body section Piedmont Student Launch Team 33 Piedmont Virginia Community College
Sander Abraham INTERFACES Piedmont Student Launch Team 34 Piedmont Virginia Community College
Interfaces - Internal • Avionics bay – Upper and lower sections • Experiment • Motor mount Piedmont Student Launch Team 35 Piedmont Virginia Community College
Interfaces - External • Launch rail – 1515 – 12 ft – Distance between rail buttons: 27.6 in • Experiment camera • Tracking system and transmitter Piedmont Student Launch Team 36 Piedmont Virginia Community College
Andrew Oxford STATUS OF REQUIREMENTS VERIFICATION Piedmont Student Launch Team 37 Piedmont Virginia Community College
Status of Requirements Verification – Overall • Project is currently on schedule Not Started In Progress Completed Piedmont Student Launch Team 38 Piedmont Virginia Community College
Status of Requirements Verification – Verified • Design – Meets all requirements • Subscale flight – December 10 th Piedmont Student Launch Team 39 Piedmont Virginia Community College
Status of Requirements Verification – On Going • Educational engagement – Have checklists • Website – 90 Female – 17 Male – Continuing to be updated – 69 Direct engagement – Hosting all deliverables – More activities planned • Safety – Continuing to update safety plans Piedmont Student Launch Team 40 Piedmont Virginia Community College
Status of Requirements Verification – In Progress • Subscale re-flight – January 21 st • Full scale test flight – Construction is underway – Launch planned for February 4 th • FRR • Launch week Piedmont Student Launch Team 41 Piedmont Virginia Community College
Questions? Piedmont Student Launch Team Piedmont Virginia Community College
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