1. Battlin’ Pete II 10th International Submarine Race
David Taylor Model Basin
Washington DC, Maryland
June 25, 2007

2. Design Team David Hume Peter Moser Cale Jurin Cale Jurin
- Design & Propulsion Safety
Cale Jurin Cale Jurin
- Pedals & Cables Elevator & Controls
David Hume Peter Moser
- Air Systems Rudder & Controls

3. Goals
To increase the speed obtained by Battlin’ Pete I while using the same hull form but different propulsion.
Simplistic and robust construction.
Safe and easy control and operation.
Spend less than $100 on construction and supplies.

4. Philosophy Mimic nature; i.e. the swimming motion of a penguin.
Flapping foil propulsion studies led to identify strouhal number range .2~.4 for animals.
St = f a / V
with an projected speed of 3 knots:
.3 = f (3’stroke)/ (5 ft/sec)
f = .5Hz = 30 RPM target frequency
Use leg press motion for increase in power input. (previous design had single fin with no counterforce)

5. Hull Reused hull form of Battlin’ Pete I with several modifications.
Fiberglass hull with stainless steel tubing support frame.
All hull extremities supported with backing plates and rubber spacers to alleviate stress concentrations.
Buoyancy
Dock system Styrofoam
Ballasted with dive weights

6. Propulsion
Hobie Mirage Drive used for foil due to flexibility (prevent stalling and separation effects) and proven effectiveness
Controlled heaving and pitching motion
Adjustable foot pedals to accommodate different drivers
Sprockets and cam transmission.

7. Control Elevators Rudder Dagger boards used from small sailing craft.
Interconnected control of each fin by single lever.
Located on forward third of hull length for increased maneuverability.
Rudder
Plywood formed to steam lined shape of rudders.
Utilizes a closed loop pulley system (crew shell)
Located on top of hull

8. Air Systems Two primary tanks in rack behind seat.
For exhaust vents used ventilation cover from small inboard.
Corrugated canopy
Emergency bottle for entering/escaping.
Ratings
Primary: 80 cubic feet
Emergency: 13 cubic feet

9. Safety Reserve buoyancy ballasted down with dive weights
Emergency Buoy with high visibility line
Running Lights
Transparent easy opening cover
Non-skid pedals
Quick release harness
High visibility paint on all fins, stabilizers, and elevators

10. Timeline Week 1-4 Design Week 5-17 Re-Construction/ Revisions
Incorporate new design into original hull form
Removal of internals and dry planning/ measuring
Week 5-17 Re-Construction/ Revisions
Collection/purchasing of materials
Measuring, cutting, welding, machining, installing, painting, waxing.
Week Testing
In pool to fine tune buoyancy & stability
Controls and propulsion motion

11. Budget < $100
Majority of raw materials was used from scrap piles around campus:
Aluminum mast from sailing team
Chair provided by Band Company Ward Room.
Welding supplies and tools provided by Joe Kass (USMMA welding instructor)
Hobie Mirage drive donated by Hobie Company
Items bought from Granger:
Steel cable
Transparent PVC sheet
Velcro
Assorted nuts and bolts

12. Closing Learning Experience
Welding Techniques (aluminum, stainless steel, mild steel)
Fiberglass Construction
Modified original design continuously throughout construction
Future modifications should include:
Hull form changes, reduce cross sectional area by putting driver in prone position (drag reduction)
Additional drive either on top or directly behind in tandem