1. Team 5 Vehicle Sizing PDR
Presented By: Trent Lobdell
Ross May
Charles Stangle

2. Outline New Design Adjustments Weight Estimations
Properties of the Wing
Coefficient Estimations
Resulting Constraint Diagram
Final Constraint Diagram
Specified Loading within Design Space
Final Numbers
Issues with given Code
Future Considerations
February 3, 2005
AAE 451 – Team 5

3. New Design Adjustments
Reasons
Rough initial design had CG too far aft
AC was not behind CG
Reasonable aspect ratio
Shapelier wing section
Design adjustments suggested by customer
February 3, 2005
AAE 451 – Team 5

4. Adjustments Shortened booms Decreased weight behind engine Moved CG up
Pushed leading edge of wing back
Reduced wing area
Changed for better AR
AR Moved AC back and CG slightly forward
February 3, 2005
AAE 451 – Team 5

5. Further Adjustments Smaller tail section
Again, moved CG farther forward
Maintains appealing stealth theme
February 3, 2005
AAE 451 – Team 5

6. Weight Estimation Initial guess of 7.5 lbf from tables
Empty weight estimated at 6 lbf
Motor weight of 0.75 lbf
Energy density of batteries: joule/lbf
Guessed 3% battery weight fraction for take off and warm-up
Loiter time set at 30 min
Sizing code rendered a weight of:
7.34 lbf
February 3, 2005
AAE 451 – Team 5

7. Properties of the Wing Wing Area Aspect Ratio
Counted the 3x3 inch blocks on final diagram
S = 900 in2
Aspect Ratio
b = 5 feet wing span
AR = b2/S = 4
February 3, 2005
AAE 451 – Team 5

8. Coefficient Estimations
Drag Coefficients
0.0025, 0.003,
Lift Coefficients
1.0, 1.25, 1.5
(CD1 with CL1) etc.
February 3, 2005
AAE 451 – Team 5

9. Resulting Constraint Diagram with Flexible Values
Design Space:
Power Loading W/Bhp
Wing Loading W/S
February 3, 2005
AAE 451 – Team 5

10. Constraint Diagram With Moderate Values
Design Space:
CL = 1.25, CD = 0.003
February 3, 2005
AAE 451 – Team 5

11. Workin’ in the Design Space
Power Loading W/Bhp
Wing Loading W/S
February 3, 2005
AAE 451 – Team 5

12. Known Vehicle Specifications
Weight = 7.34 lbf
Span = 60 in
AR = 4
Wing Area = 900 in2
Chosen Wing Loading = lbf/in2
Chosen Power Loading = 0.09 lbf/Bhp
February 3, 2005
AAE 451 – Team 5

13. Issues With Code Poorly commented Hard to follow due to excess code
Did not function with the three inputs that it seemed to require (CL and CD)
Hashes needed adjustment
Neo hates it, and you.
February 3, 2005
AAE 451 – Team 5

14. Future Considerations
Implement energy consumption equations
Solidifying some of the numbers
Take off battery weight fraction
Warm-up battery weight fraction
Drag coefficient
Lift coefficient
L/D
February 3, 2005
AAE 451 – Team 5

15. Doubts? Thoughts? Things left unsaid?
February 3, 2005
AAE 451 – Team 5