Transcript presentation

The Electric Boat Challenge:
Is Solar Power Better than
Gasoline Power?
Or does H2 Work Best?
Dr. Andrew Zborowski, Ph.D.
and Frank R. Leslie, BSEE, MS Space Technology
1/14/2005
1. Abstract
• Identical trolling
motors
• Similar hulls
• Identical batteries
• Differing energy
sources
• What is to be
demonstrated?
Abstract
Solar
Gasoline
What speeds and distances
result from solar &
gasoline, etc. sources?
2. Hull Forces
• Drag force is
proportional to speed
squared
• Drag force is balanced
by motor force
resulting in
equilibrium speed
• Different hull shapes
result in different
maximum speeds
Hull Forces
Fh = k • S2
Fm = Fh
Fm
Fh
Moving this way -->
Speed limited by forces
3. Motor Thrust
• Measure thrust force
with “open water”
around prop (bollard
test)
• Plot relationships
• Compare motors
• Specification of 30
pounds thrust
Motor Thrust
Fm
Load Resistance
Force,
Current
Voltage
What is “best” load?
4. Travel Energy
• Energy =
Power • time
• E=P•t
• Define race end
• Define time &
distance
V = d/t
Travel Energy
Distance, d
What energy is required?
5. Energy Storage
• Battery depletion rate
• Are batteries truly
identical?
• Full charge at 12.80
volts (TBR; to be
reviewed)
• Discharge load of
motor affects available
ampere-hours
• Stop at 10.5V to
preserve battery life
Energy Storage
=?
10.5 V
Voltage,
E
Time, t
Trade power vs. energy
6a. Energy Sources
• Internal Combustion
Engine (ICE) burning
gasoline and oil mix
charges battery
Energy Sources
Gasoline ICE
Gasoline
– Requires fuel
• Solar Panel charges
battery
– Requires sun
Crude
oil
Solar or PV
What else to use?
6b. Energy Sources
• Fuel Cell
– Hydrogen & air in
– Water & Electricity out
– ~12Vdc; 1000 watts
Energy Sources
12Vdc
Hydrogen Fuel Cell
Fuel
Cell
• Leslie’s Pedal Cycle
– Requires food in
– Biomass to mechanical
to electrical energy
– 14 volts @ 6 amps
charges battery
Hydrogen
Pedal Cycle
Which to use?
7. Race Conditions
• Ready to race?
– Good weather
– Calm water
– Wind below 4 knots
– Batteries charged
– Known weight
– Straight, sheltered course
– Side-by-side start
– End defined by battery
voltage less than 10.5
volts per digital
multimeter or H2 tank
empty
Race Conditions
Perhaps a little
slower
8. Potential Conclusions and Findings
• Match results against
theory
Potential Conclusions and
Findings
– Explain discrepancies
• Data analysis shows
that . . . ?
• Recommendations for
the following classes
--- “Lessons Learned”
• Create report and
present results
What’s next?