Design of a Dawn Mulvihill Competition Model Airplane Presented by: Jacob Gomez And Daniel Heinrich Advisor: Professor Fazal B. Kauser, P.E.

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

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

Introduction Dawn Mulvihill Absence of thermals Most efficient model wins

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

Dawn Mulvihill Must be rubber strip powered Projected wing area under 300 in² No maximum flight time Models flown at 7:00AM

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

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

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

Methods to Achieve Goal Aircraft Design Testing Equipment Evaluation and Analysis of Data Flight Testing

Design

Equipment - testing

Generated Torque Curves

Equipment - flying Winding stooge. Stretch winding. Efficient winding.

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.

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

Time Table (rev 1) Project began in August 2003 with design and evaluation process. Table is subject to revision.

Closing Thoughts