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Paper: Potential environmental benefits of a hybrid RAM turboprop

A 2017 paper “Analysis and design of hybrid electric regional turboprop aircraft” investigates the potential environmental benefits of hybrid electric regional turboprop aircraft in terms of fuel consumption.

Published in the CEAS Aeronautical Journal , Volume 9, Issue 1, and written by Mark Voskuijl, Joris van Bogaert, and Arvind G. Rao, all of Delft University of Technology in The Netherlands, the paper uses lithium–air batteries as an energy source in combination with conventional fuel. It outlines a validated design and analysis framework extending it with sizing and analysis modules for hybrid electric propulsion system components.

The paper introduces a modified Bréguet range equation (above) suitable for hybrid electric aircraft. The results quantify the limits in range and performance for this type of aircraft as a function of battery technology level.

It suggests a typical design for 70 passengers with a design range of 1528 km, based on batteries with a specific energy of 1000 Wh/kg, providing 34% of the shaft power throughout the mission, would yield an emissions reduction of 28%.