Design of a Dawn Mulvihill Competition Model Airplane

1
Design of a Dawn Mulvihill Competition Model
Airplane

• Presented by
• Jacob Gomez
• And
• Daniel Heinrich
• Advisor
• Professor Fazal B. Kauser, P.E.

2
Overview
Design and construction of an elastic powered,
free-flight, model airplane conforming to the
rules of Dawn Mulvihill.
3
Introduction

• More from less.
• Flying for time.
• Elastic powered.

4
Introduction

• Dawn Mulvihill
• Absence of thermals
• Most efficient model wins

5
Purpose

• Maximum utilization of energy
• 1/8 inch rubber strip power source
• Dawn Mulvihill Classification
• Double the existing high time

6
Dawn Mulvihill

• Must be rubber strip powered
• Projected wing area under 300 in²
• No maximum flight time
• Models flown at 700AM

7
Rationale

• Indoor models fly for more than one hour
• Indoor models have limited ceiling
• Outdoor models have virtually unlimited ceiling
• Outdoor times 25 of indoor times

8
Hypothesis

• Current designs not at maximum efficiency.
• 30 minute flight times should be attainable.
• Utilization of energy.
• Maximization of thrust.

9
Research

• Most research passed on orally
• Current designs evaluated
• Interviewed the Top Guns of Mulvihill.
• The canard proven more efficient

10
Methods to Achieve Goal

• Aircraft Design
• Testing Equipment
• Evaluation and Analysis of Data
• Flight Testing

11
Design
12
Equipment - testing
13
Generated Torque Curves
14
Equipment - flying

• Winding stooge.
• Stretch winding.
• Efficient winding.

15
Evaluation and Analysis

• Selection of motor with most linear torque curve.
• Matching propeller design to torque output.
• Allowing the propeller to operate in a narrower
  band of torque values.
• Propellers of varying design and initial pitch
  settings.

16
Flight Testing

• 3 Models to be constructed
• First model approximately 170 in²
• Second model full size with standard prop
• Third model full size with optimal prop

17
Time Table (rev 1)

• Project began in August 2003 with design and
  evaluation process. Table is subject to revision.

18
Closing Thoughts