Randy Draeger Grant Stockton David Upp Mini-Submarine Randy Draeger Grant Stockton David Upp

Problem Statement As High School students, we have not fully investigated or applied the concepts and applications of electronics, fluid dynamics, energy systems, mechanical systems, calculus and physics in the construction and use of submersible technologies Entirely math, physics, and engineering based Challenging to make all components work in unison Realistic goal, and submersibles have a place in the modern world

Group Development Randy – Leader due to personal experiences and strong will for the completion of the project Grant – Scribe due to neat hand writing and attention to detail David – Time Keeper due to his past experiences with engineering and his ability to accurately a lot time for each task

Background First submarine made by Dutch. Used oars underwater for propulsion First military submarine was produced by an American Nicknamed Turtle Failed during trial run in the civil war Consequently submarine projects were abandoned until the 20th century Modified with internal combustion engines, newer ballast control systems, silent propulsion systems, a nuclear missiles

Customer Mr. Pritchard – ITC instructor and will serve as our supervisor Ms. Brandner – AP Calculus BC instructor and will serve as our mathematical and physics expert

Project Scope Research, design and build submersible Deliverables: Submarine Final Report Final PowerPoint Presentation Consult Experts: Teachers Hobby Experts Hardware Experts Less than $400

Research How does a submarine work? What materials are submersibles made out of? How do RC components work underwater? Ballast Systems Hull Design Propulsion Systems

How does a submarine work?

How does a submarine work?

Archimedes’ Principle  

Free Force Body Diagram The force of weight is combating the force of buoyancy Recall as the volume of the object decreases, so does the buoyant force This allows the force of weight to take a more pronounced effect in bringing the submarine down underwater When the volume increases, buoyancy becomes stronger, forcing the object towards the surface

How is neutral buoyancy obtained?  

Ballast Systems Gas vs. Piston Lifespan of solutions Ease of installation and troubleshooting

Hull Design Wet vs. Dry Hull PVC is optimal because it is a polymer / composite with a density near 1 and rather strong

Propulsion Propellers attached to waterproof motor Ranking characteristics for power Angular frequency Slant length Length of blade Number of blades

RC Components Water disrupts radio waves AM frequency will go down to 20 feet good reception FM frequency stops at 5 feet RC frequencies stop around 4 feet underwater Possibility of extending the receiver wire to the surface in tether cord

Criteria Must function underwater Waterproof Electronic components are protected (safety) Movement with 3 degrees of Freedom Ballast System Maintain Neutral Buoyancy [still and motion] Diving range 5-10 ft. Video Feed (optional) Lighting (optional)

Constraints Limited weight due to buoyancy Limited Budgets ($400) Materials must withstand underwater pressure All materials must run off the same power source with the voltage drop Depth is limited to tether line

Explore Possibilities Submarine vs. ROV Wet vs. Dry Hull Piston vs. Gas Remote Control vs. Tether

Randy’s Design

David’s Design

Grant’s design

Select an approach Criteria Design 1 (Randy) Design 2 (Grant) Design 3 (David) 3 degrees of freedom 4 3 Waterproof 5 Camera Feed Functional (underwater) 1 Diving range below 4 ft. Electronics protected Y  Total 14 13 12

Initial Design Saddle Ballast Tank Design Solenoid Valves release air Wanted to keep ballast tanks away from the center hull to keep electronics dry Middle tube is dry 2 outside tubes are the ballast tanks Gas powered ballast Solenoid Valves release air

Mathematical Based Design The ballast tanks must be large enough to change the volume of water displaced to the point that the submarine will sink Based on our list of materials, and Randy’s design, the mass is estimated to be around 36 pounds or 16.329 kilograms The center hull must be four inches with an access port in the middle for electronics, and ballast must be adjusted accordingly

Mathematical Based Design 16.329 kilograms Assuming a 16.329 kilogram mass, the volume must be around 16.329 liters to be neutrally buoyant (density = 1) Volume of center hull 7.492 L Volume of access port .227 L Volume of motors .140 L Volume of solenoid boxes .442 L Total Volume without ballast tanks is 8.301 L

Mathematical Based Design Total Volume for neutral buoyancy must be 16.329 L Total Volume without ballast tanks is 8.301 L Total Volume assuming 4” diameter ballast tanks is 23.285 L Total Volume assuming 6” diameter ballast tanks is 41.968 L Volume of air in both dust off containers is 8.000 L Percentage of ballast tank used assuming 4” ballast is approximately 46% to sink = 8.091 L of air space Percentage of ballast tank used assuming 6” ballast is approximately 94% = 1.638 L of air space

Mathematical Based Design Volume of air in both dust off containers is 8.000 L 4” Ballast has 8.091 L of air space 6” Ballast has 1.638 L of air space Assuming that the ballast tanks may at one point become 100% full, the air in the dust off containers would not be enough to cause the 4” ballast submarine to surface, and it would forever be sunk The six inch PVC could resurface if 100% full

Prototyping Everything was cut first Then all the pieces were assembled Divide and Conquer Took 1 ½ months for first prototype

Assembly

Safety Glasses In the navy

Testing Round 1 – March 25, 2011

Specs Test Purpose Procedure Expected Results Actual Results Verify that the submarine is within dimension constraints Procedure Measure the length, width, and height Expected Results Submarine fits within the required 2’x2’x3’ space Actual Results PASS

Electrical Safety Test Purpose Verify that no electrical current was leaking out into the water. Avoid electrical shock Procedure Using a circuit tester, run one end to ground, and test the surfaces of the submarine and tether Submerge submarine in water, and test water for a current Expected Results No electrical leak Actual Results Electric wires were fully insulated. No electrical current found PASS

Operational Ballast Test Purpose Verify that the submarine can move up and down properly through ballast manipulation Procedure Set Submarine in water, and connect wiring Open solenoid valves and allow sub to sink Record depth it sank to Resurface

Operational Ballast Test Expected Results Sink to a depth of 5-10 feet Resurface Actual Results Did not sink FAIL

Propelled Buoyancy Test Purpose Ensure buoyancy system is operational during motion Procedure Attain neutral buoyancy Move in obstacle (cage) Expected results Pass with obstacle Results Never Sunk

Stationary Neutral Buoyancy Purpose Verify buoyancy while not moving Procedure Attain neutral buoyancy Measure time at neutrally buoyant Expected results Prototype attains neutral buoyancy Results Never sunk

Three Degrees of Freedom Purpose Verify the submarine moves along all three axis’ of motion Procedure Submerge Attain neutral buoyancy Navigate through obstacle Perform 360 degree turn Come back through obstacle Surface

Three Degrees of Freedom Expected Results Submerge Attain neutral buoyancy Navigate through obstacle Perform 360 degree turn Come back through obstacle Surface Results Never sunk

Video Feed Purpose Procedure Expected results Results Check webcam is providing input Procedure Plug in webcam Use geometric shapes to verify input Expected results Webcam provides input Results Webcam passed the test, but later was damaged by a water leak and no footage was recorded for any test

Waterproof Test Purpose Procedure Expected results Results To test the central hull and ballast tanks for leaks. Avoid electrical damage Procedure Hold submarine vertically Insert into water layer by layer, noting where water leaked Expected results No leaks Results Leaks occurred around bolts and wires Silicone did not seal the submarine

Test photos

Test conclusions Waterproofing Buoyancy Issues Further Refinements needed

Refining Outer Body Waterproofing Center of Buoyancy Fiber glass shell Waterproofing Center of Buoyancy Added 3.4 pound Weight to Adjust center of mass over center of buoyancy Web Cam remained ruined Tether Tension Top Cap Screw counter twist