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