Drag Queen

Presentation Transcript

16.00

LTA Completed Design Review

Nestor Lara, 2004

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

I

II

III

IV

V

VI

VII

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

PDR DesignCDR 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

Final Design – Intro

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

Final Design – Scale Drawing

Hyon Lee, 2004

Controls 1 and 2

The speed of each motor’s 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

Control Systems

4 Controls

1. Speed of Motor 1 (rear left)

2. Speed of Motor 2 (rear right)

3. Rotation of Motor 2

4. Altitude

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.

Aerodynamic Analysis

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

Helium Volume Required:

Aerodynamic Analysis

Lift From Volume

Thrust:

Thrust based on 9V battery

Vehicle Velocity:

Aerodynamic Analysis

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)

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.