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GoJett: A Supersonic Unmanned Aerial Flight System
Rocky Mountain Regional Technical Symposium Sibylle Walter
Graduate Research Assistant, PhD Student, CU Boulder, Aerospace Engineering Sciences
http://www.colorado.edu/busemann
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Introduction
• The Aerospace Engineering Sciences department at the University of Colorado, Boulder introduced projects for graduate students in the spring of 2009 – Two semester course designed to expose students to
project management and systems engineering while working on a complex engineering design problem
– Various projects in progress now, including a low speed blended wing UAV, hybrid sounding rocket, CubeSat, Dream Chaser cockpit design, and GoJett
• GoJett is a supersonic unmanned aerial system (UAS) that aims to break the world UAS speed record for a vehicle under 50 kg and utilize a fluid injection thrust vectoring control system.
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Small. Sleek. Supersonic.
Goals: • Build a UAV capable of achieving Mach 1.4 • Aircraft mass less than 50 kg • Fabricated for less than $50k • Break FAI* Class U-2.b world speed record
*FAI = Federation Aeronautique Internationale (world governing body of aeronautic and astronautic records)
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FAI Mission Profile
• Two 15 km cruise sections in opposite directions • 5 km approach sections • Maintain level flight (± 100 m) through speed run and
approaches • 2000 m ceiling above cruise course at all times
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2000 m
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Design Challenges • Aerodynamic design – Sears-Haack fuselage design with pitot inlet and a
cranked delta wing • Control system – Fluidic injection thrust vectoring system for yaw (& some
pitch) control allows for a tailless design; elevons for pitch and roll control • Landing Gear – Fast take-off (60 m/s) with a tricycle configuration • Propulsion system – COTS miniature turbojet with a custom afterburner to
provide 200+ lbf thrust • Structural design – Lightweight, smooth shell that can withstand supersonic
thermal gradients • Robust system – Redundant flight computers, onboard video to stream to
ground station
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Wet Mass Budget
Total Mass = 50 kg
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Progress
Sep 2009 – Project initiated (started as only propulsion work) May 2010 – First engine test cart completed and data collected Sep 2010 – Vehicle concept and goals established Sep 2011 – Prototype model tested at US Air Force Academy tri-sonic wind tunnel to validate CFD May 2012 – PDR completed Jul 2012 – Engineering test unit frame built Feb 2013 – Afterburner test (expected) May 2013 – CDR (expected) Jun 2013 – Maiden flight of test unit (expected)
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Wind Tunnel Testing at USAFA
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USAFA Mach 1.32 Tests
• Double Cranked Arrow wing design • Sears-Haack analysis used for fuselage design • Wind tunnel testing at M = 1.32 (USAFA Trisonic Tunnel) • Extensive computational fluid dynamics (CFD) conducted for validation using
ANSYS Fluent and ZEUS
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Landing Gear
Elevon
Rudder
Inlet
Servo
Bulkhead
Fuel Tanks
Antenna
Engine
Engineering Test Unit Overview
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Manufacturing Composite Skin
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90% of all work went into creating the tool
Patent Pending Patent Pending Patent Pending Patent Pending
Patent Pending Patent Pending Patent Pending Patent Pending Patent Pending
Patent Pending Patent Pending Patent Pending Patent Pending Patent Pending
Special thanks to EBS Composites for their help and support in building the engineering test unit.
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Future Work
Short Term: • Static system test of engineering test unit
• Weight and balance confirmation • Internal clearance of all systems • Hardware-in-the-loop testing • Taxi tests
Longer Term: • Flight test in the spring of 2013 • Updated design/construction to allow for
supersonic flight
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2012 Graduate Team
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Diane Dimeff Executive Director, eSpace
Chris LaPanse Aero Engineer
Brandon Bosomworth Structural Engineer
Manufacturing
Brad Wyatt Aero Engineer
Joe Tanner Senior Instructor
Chad Chaffin Systems Engineer Controls Engineer
George Miyata Project Manager
Electronics Engineer
Edgar Flores Structural Engineer
Tim Beatty Controls Engineer
Scott Christian-Dold Landing Gear Engineer
Propulsion Engineer
Sibylle Walter Propulsion Engineer
Greg Rancourt Electronics Engineer
Dr. Ryan Starkey Faculty Advisor
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Sponsorship
• eSpace: the Center for Space Entrepreneurship • United States Air Force Academy
– Transonic Wind Tunnel Testing (Mach 0.8, 1.2, 1.4) • Zona Technologies, Inc.
– Aerodynamic (Zeus)/Aeroelastic (Astros) software • EBS Composites
– Providing space and resources to build the shell
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Special thanks to the 25 seniors and ~50 grad students who have worked on various aspects of this project over the last 4 years.