1. Scuba Sub Independent Team Frederick, MD

2. Human Power Input Data suggests a human can produce something of 0.33 HP and a healthy male can produce 45-55 rpm cadence Underwater this amount could be reduced to 0.15 to 0.25 HP Conceivably there is 26.3 foot pounds of torque available for propulsion

3. Hull Form The hull form is based off a standard NACA airfoil shape previously used sub Redesigned shape with port and starboard sides concaved for boundary layer control Sintra® was used as main component of materials for the hull followed by fiberglass and carbon fiber.

4. Making the Hull

5. Shaping One sheet Sintra sandwiched between plywood Propane heater was used to heat inside insulated packing crate to 350°F Air was blown into Sintra cavity to expand the sheet When desired depth obtained heat was cut off and the door was opened for cooling

6. Hull Halves

7. Redesigned Shaping Hull was sliced down the port and starboard sides and given concave inward shape This was also done for a short section in the aft area of the sub The idea giving boundary layer control for laminar flow to the prop

8. Propulsion: Gearbox The drive train is made from a set of 4:1 ring and pinion gears and a set of 4:1 boat winch gears that have bicycle pedals attached 36” long shaft mounted from gearbox to propeller hub

9. Propulsion: Propeller Hub assembly purchased online Nine blades can be attached Each blade can change pitch angle from 30 to 60 degree in 15 degree increments 28” diameter

10. Life Support and Safety High visible strobe light mounted on top for 360 degree view Dead-man switch installed at front of sub, using standard bicycle brake gear for holding BC tank strap installed to hold 80 cubic inch tank

11. Questions