are using a road bike design, which has the rear dropouts that are designed for a derailleur hanger and fits 700c wheels. Figure : Bicycle Components Diagram. (Bicycle Buzz, 2012) Figure : (Above) Basic Bicycle Frame CAD Model 2.3 Energy Generation 2.3.1 Hub Dynamo The bicycle prototype design involved the utilization of a hub generator to capture the mechanical energy generated by the rotation of the wheels. The particular hub generator integrated into the Globol prototype was the SONdelux Dynohub. The SONdelux Dynamo hub is 390 grams in weight compared to a similar, yet older model, the Shimano hub, which is 575 grams. This hub generator is rated to produce an output of 6-volts and 3 watts. The thirty-two spoke-hole design was chosen over the thirty-six spoke-hole design to allow for less weight. The SONdelux hub generator was installed in the front wheel. The SONdelux hub is commercially available, and the wheel and hub generator was purchased as one preassembled piece. An older, Shimano hub generator is shown in the figure below to compare the older design to the newer design of the SONdelux dynohub used on the Globol prototype bicycle. Figure 5: SONdelux Dynohub Bicycle Wheel Generator Figure 6: Shimano Nutted Dynohub Table 2: Specifications for the SONdelux Dynohub Bicycle Wheel Generator Electrical power output 6 volts/ 3 Watts Energy efficiency 65% at 9 mph in 622 (700 c) wheel Weight 390 g Table Efficiency Comparison of Hub Dynamos
are using a road bike design, which has the rear dropouts that are designed for a derailleur hanger and fits 700c wheels. Figure : Bicycle Components Diagram. (Bicycle Buzz, 2012) Figure : (Above) Basic Bicycle Frame CAD Model 2.3 Energy Generation 2.3.1 Hub Dynamo The bicycle prototype design involved the utilization of a hub generator to capture the mechanical energy generated by the rotation of the wheels. The particular hub generator integrated into the Globol prototype was the SONdelux Dynohub. The SONdelux Dynamo hub is 390 grams in weight compared to a similar, yet older model, the Shimano hub, which is 575 grams. This hub generator is rated to produce an output of 6-volts and 3 watts. The thirty-two spoke-hole design was chosen over the thirty-six spoke-hole design to allow for less weight. The SONdelux hub generator was installed in the front wheel. The SONdelux hub is commercially available, and the wheel and hub generator was purchased as one preassembled piece. An older, Shimano hub generator is shown in the figure below to compare the older design to the newer design of the SONdelux dynohub used on the Globol prototype bicycle. Figure 5: SONdelux Dynohub Bicycle Wheel Generator Figure 6: Shimano Nutted Dynohub Table 2: Specifications for the SONdelux Dynohub Bicycle Wheel Generator Electrical power output 6 volts/ 3 Watts Energy efficiency 65% at 9 mph in 622 (700 c) wheel Weight 390 g Table Efficiency Comparison of Hub Dynamos