retractable tractor trailer boat tail tim slattery 11/15/12
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Retractable Tractor Trailer Boat TailTim Slattery11/15/12
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Background• Typical full tractor trailer
will get about 6 mpg & travels 120,000 miles per year
• $80,000 annual fuel cost• Rear of trailer contributes
~25% of total aerodynamic drag
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Description• Goal
• To decrease drag on rear of trailer while still allowing easy access to cargo
• Device must retract to allow doors to fully open
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Description• Hinged metal plates form
shape• Device is unlocked from
deployed position• Pivot arm is rotated, pushing
panels down the side of the trailer
• When in place, the device is locked into position and the doors can be opened
• Device is deployed by reversing this procedure
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Customer Needs• Allows use of current dock• Improves fuel economy• Device does not obscure any tail lights• Device must lock in deployed and retracted positions• Pays for itself in 1 year
0 2 4 6 8 10 12 14 16 18 200
1000
2000
3000
4000
5000
6000
7000
Ann
ual F
uel S
avin
gs (
$)
Percent Drag Coefficient Reduction
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Main Specifications• Reduces aerodynamic drag by >7%
• Annual fuel savings of $2,200• Trailer doors are free to open at least 250°• Extends off back of truck 5 feet or less
• Department of Transportation (DOT) Constraint• Does not extend past width and height of trailer
• DOT Constraint• Deploy or retract device in less than 30s• Deploy or retract in 5 steps or less
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Scope & Deliverables• Scope
• Design that allows full access to trailer doors• Reduce drag by 7-9%• Focus on retractable design mainly
• Deliverables1. Small scale trailer model to prove drag reduction2. One half scale prototype to demonstrate retractable function
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Customer• Aerodynamic Trailer Systems, LLC
• Jim Domo • Design products to improve trailer efficiency• Makers of the SmartTail®• 4-7% fuel savings• Only deploys at highway speeds
• Faculty Consultants• Dr. Gomes
• Mechanical Design, Mechanics• Dr. Wellin
• Testing, Aerodynamics, Fluid Mechanics• Dr. Venkataraman
• Fluid Mechanics, CFD, Wind Tunnel
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Team Staffing & Equipment• 4-5 ME Students
• CFD Analysis• Fluid Dynamics• Aerodynamics• Stress Analysis• Fatigue Analysis• Mechanical Design
• RIT Drag Tank• RIT Wind Tunnel• RIT Machine Shop• MSD lab
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Budget Estimate• Budget $750.00• High investment yields high long term savings• 7-9% drag reduction = $2205.59-$2835.76 annual fuel savings• Consumer cost <$2000.00 provides net savings in under one
yearItem Source Cost Each ($) Quantity Total ($)
6061 Aluminum Sheet (51” x 24” x 1/16”)
www.metalsupermarkets.com ~60 16 ~480
Miscellaneous - - - 150.006061 Aluminum Square Tubing (8 ft)
www.onlinemetals.com 7.00 4 28.00
1:24 Scale Truck www.3000toys.com 29.00 1 29.00Plywood (4’ x 8’ x 0.5”)
www.lowes.com ~9 3 ~27
2x4 boards (8 ft) www.lowes.com ~4 7 ~28 Total ~$750.00
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Future Projects• Optimize tail geometry
• Improve fuel savings• Up to 16% fuel savings• Saves $12,000 annually
• Fully automated design• Minimize operator interaction
• Full scale prototype testing
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References• Aerodynamic Trailer Systems, LLC
• www.ats-green.com• Tractor Trailer Tail: Final Report
• http://www.seniord.aere.iastate.edu • PRP
• http://edge.rit.edu/edge/R13902/public/HW_Deliverables/Individual%20Submissions/Tim%20Slattery/PRP%20Drafts/PRP-Final.pdf