4 Spheres3

1
4 Spheres3

• Presents
• The Development of Gus

2
Objectives

• Reliability, stability and controllability
• Most efficient battery usage possible
• Clarify design ambiguities
• Scare opposition
• Have a sufficiently more professional appearance
  than at the PDR

3
Gus
4
Gus
5
Final Design Evolution

• Small motor deemed unnecessary
• Corner support beams added
• Servo gear system replaced with pulley system
• Simplified central post structure
• Aluminum deemed unnecessary
• Truss structure abandoned

6
Final Design - Gus
7
Final Design - Gus

• Balloon stability
• Symmetry
• Vehicle Stability
• No control surfaces
• Simple construction
• Modular Top
• Bulky, but light

8
Dimensions and Layout
3D View
Top View
9
Dimensions and Layout
10
Weight Analysis
Balsa Wood Frame 188g
4 Balloons _at_ 70g 280g
Receiver/Antenna/Servo 28g
2 Motor Speed Control _at_ 120g 240g
2 Propellers _at_ 5.5g 11g
Mechanical Link 10g
Engine Mount T 15g
Wiring lt 10g
Battery Pack 110g
TOTAL 892g
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Aero Analysis

• Helium Vol.
• Max. Vol. 2.094 m3
• Req. Lift 8.75N
• (.892 kg)(9.81 m/s2)
• V W/(?air ?He)g
• 0.853 m3
• Vehicle Thrust
• 2 large motors yield 1.76N thrust
• Vehicle Drag
• CD estimated at 0.95
• D (½)(?airv2)(S)(CD) (½)(1.22)(v2)(1.57)(.95)
  0.9098v2

• Vehicle Velocity
• V thrust/(½CDS)½ 2.04 m/s
• S 2(pi)(.5)5 1.57 m2
• Flight Duration
• Ideal d/v 87.78/2.04 43 sec.
• Excludes deceleration due to turning and
  disturbances in airflow.
• Realistic 120 sec
• Max battery life 10 mins

12
Electronics
13
Control System
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Schedule
Mon. Tue. Wed. Thur. Thur. Fri. Sat. Sun.
14 15 16 16 17 18 19 20
Vehicle Construction CDR preparations Vehicle Construction CDR preparations Vehicle Construction CDR preparations Vehicle Construction CDR preparations Vehicle Construction CDR preparations Vehicle Construction CDR preparations Vehicle Construction CDR preparations
21 22 23 23 24 25 26 27
rehearse CDR CDR rehearse CDR CDR rehearse CDR CDR rehearse CDR CDR rehearse CDR CDR rehearse CDR CDR rehearse CDR CDR
28 29 30 30 1(May) 2 3 4
Construction Setup Electronics Construction Setup Electronics Construction Setup Electronics Construction Setup Electronics Construction Setup Electronics Construction Setup Electronics Construction Setup Electronics
5 6 7 7 8 9 10 11
Trial Tune/Repair/improve vehicle Trial Tune/Repair/improve vehicle Trial Tune/Repair/improve vehicle Trial Tune/Repair/improve vehicle Trial Tune/Repair/improve vehicle Trial Tune/Repair/improve vehicle Trial Tune/Repair/improve vehicle
12 13 14 14 15 16 17 18
RACE DAY! THE END RACE DAY! THE END RACE DAY! THE END RACE DAY! THE END RACE DAY! THE END RACE DAY! THE END RACE DAY! THE END
15
Conclusion

• After analysis and testing, we have certified
  that Gus is on the runway of life. We hope that
  his potential to be a reliable, stable, and
  efficient lighter-than-air vehicle will lead to
  success. See you on trial day.