Modern Propellers for Commuter Airlines

Modern airline propellers show significant improvements in weight, noise, cost and complexity over those designed in the 1950’s and 60’s and still in service. These improvements have come as the result of development work started a considerable number of years ago, covering aerodynamics, hub structure, blade retention, pitch control system and composite blades. These developments and associated design philosophies regarding safety and minimising maintenance costs are discussed, together with the achievement of the test background essential before new ideas can be introduced into service. In the near future wider blades and/or an increased number of blades are likely to be required as cruise speeds are pushed upwards and noise becomes an even more important design parameter.