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SAE Shell Eco-marathon
Progress Report
January 28, 2014
Abdul Alshodokhi, Moneer Al-Jawad, Jericho Alves, John Gamble, Nikolaus Glassy, Benjamin Kurtz, Travis Moore
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Overview
• Project Background
• Frame Modifications
• Drivetrain Modifications
• Technical Tasks
• Project Timeline
• Conclusion
Kurtz 2
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Project Background
Design a vehicle that maximizes fuel efficiency for the Shell Eco-marathon
competition
Competition Information
• Competition hosted by Shell
• Capstone project representing SAE NAU
Technical Advisor
• Dr. Tester
Kurtz 3
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Frame Version 1
Some issues encountered
• Rear triangle too tight for all necessary drivetrain components.
• Steering components theoretically could block driver visibility.
• Rear wheel mounting point raises vehicle COG too high.
Alves 4
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Frame Version 2
Frame Changes
• Rear triangle extended
• Roll bar mounted at a greater angle to increase driver visibility.
• Rear wheel axle mounting point raised
Alves 5
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Frontal Area/Seat Angle
Alves 6
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0 10 20 30 40 50 60 70 80
Are
a (M
^2)
Seat Angle (Degrees)
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Aerodynamic Drag
Alves 7
0
1
2
3
4
5
6
5 10 15 20 25 30
DR
AG
FO
RC
E (N
)
VEHICLE SPEED (MPH)
0.2 0.3 0.4 0.5 0.6
Frontal Area (𝑚2)
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Plug/Fairing Construction
Alves 8
1. http://www.jcrocket.com/flashgordon.shtml
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Drivetrain Modifications
The team decided to modify the purposed custom 2-stage drivetrain by
making the following changes:
• Abandoning the “power shift” clutch design
• Implementation of a centrifugal clutch
• Retaining the 2-stage drivetrain to obtain the overall gear ratio of 20:1
Alshodokhi 9
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Previous Clutch Design
Alshodokhi 10
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Centrifugal Clutch
2. http://www.heeters.com/kartclutches.shtml
Alshodokhi 11
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Drivetrain Modifications
Centrifugal clutch design drivetrain advantages:
• No need for manual clutch engagement
• Significant reduction in gear teeth wear
• Increased reliability in drivetrain
• Reduction in drivetrain noise
• Elimination of vehicle lunging
• Reduction in weight
Disadvantages
• Idle speed must be below 1600 RPM for drivetrain to be disengaged
Alshodokhi 12
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Technical Tasks
• Frame - Jericho, Nik, Travis
• Fairing - Jericho, Nik, Ben
• Fuel, Engine, Tuning - Travis, John
• Electrical - Travis, John, Ben
• Drivetrain - Abdul, Travis, John
• Steering & Braking - Moneer, Ben, Jericho
Kurtz 13
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Project Timeline
Kurtz 14
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Conclusion
• Frame revisions will allow for greater flexibility in drivetrain and steering
designs which have not been finalized.
• The new clutch design will eliminate the biggest problems that were
created by the old design. These problems include tooth wear, possible
tooth shearing, and vehicle lunging.
• Technical tasks are divided up with at least 2 people on each task. The
next steps of the project are ordering materials for the frame and building it
along with the start of fairing construction.
Kurtz 15
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References
1. John’s Rocket Site, “Flash Gordon,”
http://www.jcrocket.com/flashgordon.shtml, Jan. 2014.
2. Heeters Performance Center, “Centrifugal Clutches for Go-Karts and Mini
Bikes,” http://www.heeters.com/kartclutches.shtml, Jan. 2014.
Kurtz 16
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Questions
Kurtz 17