Drag Queen

1
Drag Queen
Nestor Lara, 2004

• 16.00
• LTA Completed Design Review

2
Drag Queen

• Nestor Lara
• Chicago, Illinois
• Alice Fan
• Orlando, Florida
• Benjamin Feinberg
• Lawrenceville, New Jersey
• Matt Williams
• Battle Creek, Michigan
• Hyon Lee
• Windsor, Canada

Nikhil (friend of group), 2004
3
Table of Contents

• Introduction
• Objectives
• Selection of Final Design
• Schematics of Final Design
• Control Systems
• Aerodynamic Analysis
• Weekly Timeline
• Conclusion

I II III IV V VI VII VII
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Objectives

• To discuss the procedure and final selection of
  Drag Queen structure
• To provide analysis regarding the components and
  method of functioning of the final design
• To accurately analyze the aerodynamics of the
  final design
• To present a final design that will work based
  upon correct calculations

Ben Feinberg, 2004
5
Final Design Intro

• PDR Design CDR Design
• 3 balloons assembled in row 3 balloons assembled
  on triangular frame
• 3 motors 2 large, 1 small 3 motors 2 large, 1
  small
• Long, thin Compact, tight
• Advantages Advantages
• Somewhat stable Stronger structure
• Lift can be adjusted Less wobbly in turns
• Simpler Structure Less chance for rollover
• Aerodynamic Symmetrical sides are possibility
• Less risk in turns, greater mobility
• Disadvantages
• Disadvantages
• Unstable in turns
• Rollover capabilities Larger Drag (but low
  speeds)
• Unoriginal

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Final Design Features

• Symmetry
• Triangular symmetry desired, but too complicated
• Established front and back to triangular LTA
• Structure
• 2 triangles (.9m sides) were assembled atop one
  another
• Between triangles is balsa wood to create durable
  and strong structure
• Electronics
• Triangular structure allows all electric motors
  to be relatively close to one another
• 1 small motor (altitude) in front , 2 large
  motors (thrust, steering) in each back corner
• Wires originate and join battery pack on platform
  in middle of LTA
• Power
• Altitude Power comes from small motor in front
• Thrust both large motors powered at same speed
• Steering with one motor / propeller fixed and
  one free to rotate, greater torque can be created
  in desired direction when turning

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Final Design Scale Drawing
Hyon Lee, 2004
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Control Systems
Controls 1 and 2 The speed of each motors
propeller is independent of one another Thus,
differential steering is possible Control
3 Motor 2 is on a swivel when pointed straight
ahead its range is 90 degrees to the left or 90
degrees to the right To add to the idea of
differential steering, this will provide greater
torque in direction of steering Control
4 Self-explanatory Used to provide lift and keep
LTA stable in case of uneven air conditions
4 Controls 1. Speed of Motor 1 (rear left) 2.
Speed of Motor 2 (rear right) 3. Rotation of
Motor 2 4. Altitude
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Control Systems
DRAG QUEEN Features Our LTA is capable of
differential steering and thrusting and also
makes use of a rotating motor. With only 4
controls on the transmitter, we are effectively
and efficiently using all controls to create a
working LTA.
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Control Systems Schematic
Hyon Lee, 2004
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Aerodynamic Analysis
Item Quantity Unit Wt. Total Wt.
Balloon 3 70 g 210 g
Large Motor / Propeller 2 210 g 420 g
Small Motor / Propeller 1 90 g 90 g
AA Battery 4 50 g 200 g
Receiver 1 27 g 27 g
Receiver Battery 1 94 g 94 g
Servos 1 43 g 43 g
Total 1284 g
Structural Frame 1 293 g 293 g
Payload TBD
Drag Queen Total Mass Drag Queen Total Mass Drag Queen Total Mass 1377 g
Vehicle Mass Limit Vehicle Mass Limit Vehicle Mass Limit 1750 g

• Note Some values taken from Interactive
  Aerospace Engineering and Design D. Newman

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Aerodynamic Analysis
Helium Volume Required
Lift From Volume
Thrust
Thrust based on 9V battery
13
Aerodynamic Analysis
Vehicle Velocity
Vehicle Drag
With Non-Perfect Flight, we estimated the
endurance of 1 round trip would be
Endurance (Based on battery life and change of
volume of balloons during flight)
14
Drag Queen Timeline
Alice Fan, 2004
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Conclusion

• By analyzing various designs and assessing the
  strength and weaknesses of each, we were able to
  select a design that provides optimal reliability
  and efficiency.  The incorporation of two large
  motors allows for better maneuverability and
  maximum thrust, while the small motor underneath
  the vehicle allows for stability and lift
  control.  The lightweight design contributes to
  the improved aerodynamics of the vehicle and
  provides greater support to the frame of the
  dirigible.  Thus, these features of our team's
  LTA make it highly competitive and give us the
  leading edge.

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Good Luck Drag Queen