4 Spheres 3 Presents The Development of Gus™
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
Gus™
Gus™
Final Design Evolution Small motor deemed unnecessary Corner support beams added Servo gear system replaced with pulley system Simplified central post structure Aluminum deemed unnecessaryAluminum deemed unnecessary Truss structure abandonedTruss structure abandoned
Final Design - Gus™
Balloon stability Symmetry Vehicle StabilityVehicle Stability No control surfacesNo control surfaces Simple construction Modular Top Bulky, but light
Dimensions and Layout Top View 3D View
Dimensions and Layout
Weight Analysis Balsa Wood Frame 188g 4 70g 280g Receiver/Antenna/Servo28g 2 Motor & Speed 120g 240g 2 5.5g 11g Mechanical Link 10g Engine Mount “T” 15g Wiring < 10g Battery Pack 110g TOTAL892g
Aero Analysis Helium Vol. Max. Vol. = m 3Max. Vol. = m 3 Req. Lift = 8.75NReq. Lift = 8.75N = (.892 kg)(9.81 m/s 2 ) = (.892 kg)(9.81 m/s 2 ) V = W/[(ρ air – ρ He )g]V = W/[(ρ air – ρ He )g] = m 3 = m 3 Vehicle Thrust 2 large motors yield 1.76N thrust2 large motors yield 1.76N thrust Vehicle Drag C D estimated at 0.95C D estimated at 0.95 D = (½)(ρ air v 2 )(S)(C D ) = (½)(1.22)(v 2 )(1.57)(.95) = v 2D = (½)(ρ air v 2 )(S)(C D ) = (½)(1.22)(v 2 )(1.57)(.95) = v 2 Vehicle Velocity V = thrust/(½C D S) ½ = 2.04 m/s S = 2(pi)(.5) 5 =1.57 m 2 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
Electronics
Control System
Schedule Mon. Tue.Wed.Thur.Fri.Sat.Sun Vehicle Construction CDR preparations rehearse CDR: CDR (May)234 Construction Setup Electronics Trial Tune/Repair/improve vehicle RACE DAY! THE END
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.