Results to date on this project indicate that a regenerative braking system based on elastomeric energy storage is technically feasible, and that improvements in the elastomer further enhance the prospects of such a system. In particular, improvements in energy density are highly desirable, as this would directly reduce the required volume. Reductions in stress-relaxation rates are also desirable because less compensating is needed in the initial design. Finally, improvements in fatigue life are desirable, as this would directly increase the time between replacements of the elastomeric units. Various manufacturers and researchers have been approached to determine if an elastomer more suitable than natural rubber is available or if one is likely to be developed. The general consensus is that natural rubber is now superior to all synthetics, but suitable materials research might lead to significant improvements. No definite plans have yet been made to carry on such materials research.
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