SAE Brazil AeroDesign Challenge
Miguel Jimenez Ricardo LugoCarlos Rojas
Advisor: Andres Tremante
Florida International UniversityDepartment of Mechanical and Materials Engineering
Problem Statement Competition Background Metrics Design Alternatives Wing Design Proposed Design Stability and Servos Timeline
Overview
Designing a remote-controlled aircraft for a competition in São Paulo, Brazil in late 2010.◦ Aircraft should lift the most possible weight with
predefined constraints.
Competition is hosted by SAE Brazil, where universities from all around the globe meet for this event.
Problem Statement
Flight Path:◦ Airplane must take off within 61 meters◦ Land within 122 meters.
Competition Background
* Image courtesy of SAE Brazil
SAE Brazil sets the maximum dimensions for the aircraft according to the following formula:
D: total dimensionL: distance from front to back measured linearlyH: maximum height (without propellers)Bi: span of lift-generating componentsn: number of lift-generating components
Metrics of Design
DL H Bii1
n
where 4.00mD6.50m
Maximum weight: 20 kg, including gasoline
Metrics of Design
Engine: O.S .61 FX◦ Specifications:
Displacement: 0.607 (cu in) 1.9 horsepower at 16,000 RPM RPM: 2,000-17,000 Weight: 19.4 oz. 0.866” stroke
◦ MSRP: $170.00
Engine Specifications
For an R/C aircraft, the most critical component is the wings. In this sense, the fuselage is not as critical as in full-size airplanes, therefore its design is less rigorous.
Design Alternatives
Wing Design Parameters
Placement Shape Dihedral Angle
High Wing Straight Straight
Mid Wing Sweepback Tip
Low Wing Delta Polyhedral
Wing Type: Straight
Wing Position: High Wings (above fuselage)
Other Wing Considerations: Straight Dihedral
◦ To be determined with CFD analysis
Proposed Design
Stability and Servos Four servos will control the airplane’s
attitude: Thrust, Yaw, Pitch, and Roll
Empennage
• Yaw Rudders
• Pitch Elevators
Wing
• Roll Ailerons
Timeline
Number Task Start End Duration2010
January February March April May June July August September October November December
1 Research 1/11/2010 3/1/2010 47
2 Literature Survey 2/1/2010 5/15/2010 98
3 Design 2/15/2010 4/27/2010 68
4 Aerodynamic Design 3/10/2010 4/20/2010 39
5 Propulsion Calculation 4/7/2010 4/21/2010 15
6 Computation Fluid Dynamics 4/20/2010 5/20/2010 30
7 Control and Stability 4/28/2010 8/7/2010 98
8 Model Construction 6/1/2010 7/1/2010 30
9 Wind Tunnel Testing 7/3/2010 7/20/2010 17
10 Prototype Construction 8/1/2010 9/10/2010 39
11 Testing 9/15/2010 10/1/2010 16
12 Revise 9/15/2010 10/21/2010 35
13 Competition 10/21/2010 10/24/2010 4
14 Report 2/1/2010 12/8/2010 294
15 Presentation 12/5/2010 12/6/2010 2
Division of Responsibilities• Miguel Jimenez
• Aerodynamic Design• Computational Fluid Dynamics• Propulsion Calculation• Prototype Construction
• Ricardo Lugo
• Aerodynamic Design• Control and Stability• Prototype Construction
• Carlos Rojas
• Radio Control survey• Servos and Channels• Competition parameters • Prototype Construction
Structural Design and CFD analysis is planned for May-June 2010, months before the competition
Wing Design needs dihedral angle CFD testing before modeling
Funding is a key for prototype construction
Conclusion
The End