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By Bjorn Fehrm

Introduction

October 13, 2022, © Leeham News: In our series, we look at the development of the latest single-aisle engines. Should these be geared? What do you gain and risk with a geared design? Is this a new development, or has it been around for a long time?

We examine the development of single-aisle engines since 2000, their fuel efficiency, and operational reliability.

Summary

• A geared design fixes some fundamental problems in a two-shaft turbofan.
• CFM proves you could just as well further develop what you have.