Drag QueenSlide 2Table of ContentsObjectivesFinal Design – IntroFinal Design FeaturesFinal Design – Scale DrawingControl SystemsSlide 9Control Systems – SchematicAerodynamic AnalysisSlide 12Slide 13Drag Queen TimelineConclusionGood Luck Drag QueenDrag QueenDrag Queen16.0016.00LTA Completed Design ReviewLTA Completed Design ReviewNestor Lara, 2004Nestor Lara, 2004Drag QueenDrag QueenNestor LaraNestor LaraChicago, IllinoisChicago, Illinois Alice FanAlice FanOrlando, FloridaOrlando, FloridaBenjamin FeinbergBenjamin FeinbergLawrenceville, New JerseyLawrenceville, New JerseyMatt WilliamsMatt WilliamsBattle Creek, MichiganBattle Creek, MichiganHyon LeeHyon LeeWindsor, CanadaWindsor, CanadaNikhil (friend of group), Nikhil (friend of group), 20042004Table of ContentsTable of ContentsIntroductionIntroductionObjectivesObjectivesSelection of Final Selection of Final DesignDesignSchematics of Final Schematics of Final DesignDesignControl SystemsControl SystemsAerodynamic AnalysisAerodynamic AnalysisWeekly TimelineWeekly TimelineConclusionConclusionIIIIIIIIIIIIIVIVVVVIVIVIIVIIVIIVIIObjectivesObjectives• To discuss the procedure and To discuss the procedure and final selection of Drag Queen final selection of Drag Queen structurestructure• To provide analysis regarding To provide analysis regarding the components and method of the components and method of functioning of the final designfunctioning of the final design• To accurately analyze the To accurately analyze the aerodynamics of the final designaerodynamics of the final design• To present a final design that To present a final design that will work based upon correct will work based upon correct calculationscalculationsBen Feinberg, Ben Feinberg, 20042004Final Design – IntroFinal Design – IntroPDR DesignPDR DesignCDR DesignCDR Design3 balloons assembled in row3 balloons assembled in row3 balloons assembled on 3 balloons assembled on triangular frametriangular frame3 motors: 2 large, 1 small3 motors: 2 large, 1 small3 motors: 2 large, 1 small3 motors: 2 large, 1 smallLong, thinLong, thinCompact, tightCompact, tightAdvantagesAdvantages::Advantages:Advantages:Somewhat stableSomewhat stableStronger structureStronger structureLift can be adjustedLift can be adjustedLess wobbly in turnsLess wobbly in turnsSimpler StructureSimpler StructureLess chance for ‘rollover’Less chance for ‘rollover’AerodynamicAerodynamicSymmetrical sides are possibilitySymmetrical sides are possibilityLess risk in turns, greater mobilityLess risk in turns, greater mobilityDisadvantages:Disadvantages:Disadvantages:Disadvantages:Unstable in turnsUnstable in turns““Rollover” capabilitiesRollover” capabilitiesLarger Drag (but low speeds)Larger Drag (but low speeds)UnoriginalUnoriginalFinal Design FeaturesFinal Design FeaturesSymmetrySymmetry•Triangular symmetry desired, but too complicatedTriangular symmetry desired, but too complicated•Established ‘front’ and ‘back’ to triangular LTAEstablished ‘front’ and ‘back’ to triangular LTAStructureStructure•2 triangles (.9m sides) were assembled atop one another2 triangles (.9m sides) were assembled atop one another•Between triangles is balsa wood to create durable and strong structureBetween triangles is balsa wood to create durable and strong structureElectronicsElectronics•Triangular structure allows all electric motors to be relatively close to one Triangular structure allows all electric motors to be relatively close to one anotheranother•1 small motor (altitude) in front , 2 large motors (thrust, steering) in each 1 small motor (altitude) in front , 2 large motors (thrust, steering) in each back cornerback corner•Wires originate and join battery pack on platform in middle of LTAWires originate and join battery pack on platform in middle of LTAPowerPower•Altitude: Power comes from small motor in frontAltitude: Power comes from small motor in front•Thrust: both large motors powered at same speedThrust: both large motors powered at same speed•Steering: with one motor / propeller fixed and one free to rotate, greater Steering: with one motor / propeller fixed and one free to rotate, greater torque can be created in desired direction when turningtorque can be created in desired direction when turningFinal Design – Scale Final Design – Scale DrawingDrawingHyon Lee, 2004Hyon Lee, 2004Control SystemsControl Systems4 Controls4 Controls1. Speed of Motor 1 (rear left)1. Speed of Motor 1 (rear left)2. Speed of Motor 2 (rear right)2. Speed of Motor 2 (rear right)3. Rotation of Motor 23. Rotation of Motor 24. Altitude4. AltitudeControls 1 and 2Controls 1 and 2The speed of each motor’s propeller is The speed of each motor’s propeller is independent of one anotherindependent of one anotherThus, differential steering is possibleThus, differential steering is possibleControl 3Control 3Motor 2 is on a swivel: when pointed Motor 2 is on a swivel: when pointed straight ahead its range is 90 straight ahead its range is 90 degrees to the left or 90 degrees degrees to the left or 90 degrees to the rightto the rightTo add to the idea of differential To add to the idea of differential steering, this will provide greater steering, this will provide greater torque in direction of steeringtorque in direction of steeringControl 4Control 4Self-explanatorySelf-explanatoryUsed to provide lift and keep LTA stable Used to provide lift and keep LTA stable in case of uneven air conditionsin case of uneven air conditionsControl SystemsControl SystemsDRAG QUEEN FeaturesDRAG QUEEN FeaturesOur LTA is capable of differential steering and thrusting Our LTA is capable of differential steering and thrusting and also makes use of a rotating motor.and also makes use of a rotating motor.With only 4 controls on the transmitter, we are effectively With only 4 controls on the transmitter, we are effectively and efficiently using all controls to create a working and efficiently using all controls to create a working LTA.LTA.Control Systems – SchematicControl Systems – SchematicHyon Lee, 2004Hyon Lee, 2004Aerodynamic AnalysisAerodynamic AnalysisNote: Some values taken from Note: Some values taken from Interactive Aerospace Engineering and DesignInteractive Aerospace Engineering and Design: D. Newman: D. NewmanItemItemQuantitQuantityyUnit Unit Wt.Wt.Total Total Wt.Wt.BalloonBalloon3370 g70 g210 g210 gLarge Motor / Large Motor / PropellerPropeller22210 g210 g420 g420 gSmall Motor / Small