The paper reviews the present state of knowledge and design techniques and attempts to provide a physical appreciation of the characteristics of bearing performance. The work which has been carried out recently in the United Kingdom, the United States, The Netherlands and Germany is examined and the paper attempts to relate this to experimental results and the practical engine. The possible relationships of components within the engine which affect the conditions of operation and parameters which could lead to improvement of these conditions are suggested and examined, and the possibilities of future work in exploring this area are indicated.
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