1. Springstead High School

2. Overview + Goals  17 team members  Two-manned sub for increased performance  Newest entry for Springstead High School  Participation from entire team

3. Design Philosophy  Maximum human power  New drivetrain design

4. Hull Design + Fabrication  Students laid out a full-scale drawing of SubZero  SubZero was designed to be 15ft long with a diameter of 24 inches.  The hull of SubZero was created from a male plug constructed of plywood.

5. Hull Design + Fabrication (Cont.)  The plug was sanded, covered with visquen and coated with mold release wax.  Two half-hulls were laid up using two layers of 12oz. Bi- axial cloth with one layer of matt in between.  The two halves were joined together.

7. Propulsion Design +Fabrication  The team worked with a local machinist to create a straight 6 to 1 gear drive.  One pilot would be on his/her stomach and the other pilot would be on their back.  Stainless steel pipe for driveshaft.

9. Propeller  SubZero’s propeller was created from flat stainless steel stock.  It was heated red hot and forged into the shape dictated by the Java Prop program.  Additional strengthening and filling was done with tig welding.  It was finished off with hand sanding and polishing.

10. Control Design  SubZero has two vertical and two horizontal control surfaces that are actuated by Teleflex cables.  Three stabilizing fins.

12. Life Support Design  Each pilot wears a spare air on his/her chest.  Two 30 cu.ft. scuba tanks are mounted fore and aft.  The front tank is located directly below the pilot.  The rear tank is located on the ceiling above the pilot.

13. Safety  The bow is heavily enforced.  Pilots are visible at all times with a fore window as well as an aft window.  Hatches float freely when released.  Foot straps are clearly visible with red cloth.  Strobe light provides a steady location.

14. Testing  SubZero is tested in the Gulf of Mexico as well as the Weeki Wachee River.  Dozens of testing hours has been logged.  This revealed numerous needed to be resolved.

16. Training  The SubZero team certified 7 new divers.  Team members train using stationary bicycles, actual bicycles and running.  Each team member was trained in each support position.