Upload
wesley-morris
View
216
Download
2
Tags:
Embed Size (px)
Citation preview
PurposePurpose
Maximum utilization of energy1/8 inch rubber strip power sourceDawn Mulvihill ClassificationDouble the existing high time
Dawn MulvihillDawn Mulvihill
Must be rubber strip poweredProjected wing area under 300 in²No maximum flight timeModels flown at 7:00AM
RationaleRationale
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
HypothesisHypothesis
Current designs not at maximum efficiency.
30 minute flight times should be attainable.
Utilization of energy. Maximization of
thrust.
Sample rubber motor test curve
010203040
0 20 40 60 80 100 120
Number of winds / 10
To
rqu
e (i
n/o
z)
ResearchResearch
Most research passed on orally
Current designs evaluated
Interviewed the “Top Guns” of Mulvihill.
The canard proven more efficient
Methods to Achieve GoalMethods to Achieve Goal
Aircraft DesignTesting EquipmentEvaluation and Analysis of DataFlight Testing
Equipment - testingEquipment - testing
ASSEMBLY KEY 1) Electric Motor
2) Photo Gate Sensor
3) Test Motor
4) Fixed Supports
5) Electric Balance (for calibration)
6) Light Gauge Steel Post to Balance Hard Joined
7) Double Strain Gauge Assembly
8) Attachment to Balance
9) Wire Shaft
A] Separate Balance Assembly
----] Indicates Cut Away
1
4 4 4 4
9
2
3
9
A
5
876
7
5 8
6
TOP VIEW FRONT VIEW
PRELIMINARY DESIGN FOR RUBBER MOTOR TORQUE TESTER
Jacob Gomez and Dan Heinrich
A A
Evaluation and AnalysisEvaluation and Analysis
Selection of motor with flattest 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 TestingFlight Testing
3 Models to be constructedFirst model approximately 170 in²Second model full size with standard propThird model full size with optimal prop
Time TableTime Table 8/03 9/03 10/03 11/03 12/03 1/04 2/04 3/04 4/04 5/04 6/04
Interviews and research
Model design
First model construction
First model testing
Second model construction
Second model testing
Rubber testing
Propeller design
Propeller testing
Final model construction
Final model testing
Project began in August 2003 with design and evaluation process. Table is subject to revision.