Seacoast International Submarine Team Langdon Tarbell, Ryan Forbes, Matt Crist, Tyler Dutile, Sean LaMontagne, Mike Cargill Hull The hull is made of many layers of fiberglass with a foam core. Construction of the hull The hull was constructed using plywood ribs spaced 6 inches apart to create the general shape of the sub. We chose the foam core construction method because would help create a strong righting point as well as a more robust frame. Safety and Life Support • Safety The safety buoy is a positively buoyant cutout of the hull. It has been attached to a spool of cord that will act as a dead-man switch. The positively buoyant hatch will open when the hatch release is pulled. • Life Support SCUBA Spare Air Propulsion • Power unit Consists of a bicycle drive system mounted upside down and a right angle gear. This unit is mounted to an aluminum plate that is fiberglassed to the hull . • CW-CW Right Angle Gear Transfers the motion from the bicycle to the shaft. • Shaft A universal Joint attached to a steel pipe supported by a Teflon bearing with dual propellers attached to the end of the shaft. Propulsion (Cont.) Dual Propeller • Impeller The impeller is used to increase the amount of water that is pushed over the blades of the propeller. • Propeller We took the idea of a basic 2 bladed boat propeller and modified it to suit our specifications. IE- power, input, RPM, pitch, Controls and Control Surfaces • Dive Plans The dive planes are controlled by the movement of a curved piece of steel bolted to the shaft that extends from the planed. • Rudders The rudders are controlled by a cable with one end attached to a rudder ring on one end and an actuator. • Stern Planes They are fixed to counteract the rotational torque from the propeller.