1. Further Testing – April 10, 2011

2. Operational Ballast Trial Initial Conditions Met Video Feed Register
Time To Sink (s)
Depth (ft)
Level Submarine
Resurface
Watertight Central Hull
Pass/ Fail 1
Yes
None
741 3 No
Fail 2
747
740

3. Operational Ballast Volume Of Submarine: 41968.25056 mL
Mass Of Submarine: g
Initial Density: kg/L
Initial Buoyancy: N
Density At Submersion: kg/L
Buoyancy At Submersion: N
Change In Volume Through Submersion: L
Change In Buoyancy Through Submersion:
Percent Of Ballast Tanks Filled With Water To Submerge: %

4. Propelled Neutral Buoyancy
Dove underwater but did not attain neutral buoyancy
Inclined dive due to center of mass alignment

5. Stationary Neutral Buoyancy
Dove underwater but did not attain neutral buoyancy
Inclined dive due to center of mass alignment

6. Three Degrees Of Freedom
Dove underwater but did not attain neutral buoyancy
Inclined dive due to center of mass alignment

7. 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
One leak was found on the viewport

8. Test Conclusions Inclined dive cannot be righted
Still not waterproof although significant improvement shown

9. Refining Epoxy over front porthole for sealing
A 45 pound weight was added to the submarine
Realigns center of mass with center of buoyancy
Drastically alter initial density
Requires less water in ballast system to submerge
Less water weight in the ballast system will stop the system from performing a torque as easily
Faster sink time

10. Final Testing – April 22, 2011

11. Operational Ballast Trial Initial Conditions Met Video Feed Register
Time To Sink (s)
Depth (ft)
Level Submarine
Resurface
Watertight Central Hull
Pass/ Fail 1
Yes
None
293
8.0 No
Part. Pass 2
295 3
290

12. Operational Ballast Volume Of Submarine: 44804.35156 mL
Mass Of Submarine: g
Initial Density: kg/L
Initial Buoyancy: N
Density At Submersion: kg/L
Buoyancy At Submersion: N
Change In Volume Through Submersion: L
Change In Buoyancy Through Submersion:
Percent Of Ballast Tanks Filled With Water To Submerge: %

13. Operational Ballast

14. Operational Ballast

15. Operational Ballast

16. Operational Ballast

17. Propelled Neutral Buoyancy
Dove underwater but did not attain neutral buoyancy
Inclined dive due to center of mass alignment

18. Stationary Neutral Buoyancy
Dove underwater but did not attain neutral buoyancy
Inclined dive due to center of mass alignment

19. Three Degrees Of Freedom
Dove underwater but did not attain neutral buoyancy
Inclined dive due to center of mass alignment

20. Test Conclusions
Adding the weight did not help keep the submarine from inclining
Waterproofing was finally successful
Voltage drop is too great for the receiver extension wire

21. Future refinements Trim tanks Some other form of ascension
Propeller Placement

22. Lessons Learned (Randy)
Unforeseen Problems
Construction
Physics
Importance of calculations

23. Lessons Learned (Grant)
Water can be hard to seal out
Fiberglass is a mess
Dust Off does not taste good
Center of Mass means a lot
Physics does exist
Calculus has a practical application
Remote control can be unpredictable
Spare at least as much time in refinement as you do your original prototype
Do it right the first time

24. Lessons Learned (David)
Water is a challenge
Importance of physics concepts
Do not procrastinate
Calculus has a purpose

25. Summary
The submarine did not achieve all that it was set out to do, but gave it a good shot
Physics and calculus are used before you design something
It can be hard to make all systems run simultaneously
Test for waterproofing by parts not the full submarine at once
This was the most productive and eventful work team and project in the Academy due to our past experiences