A new method for improving the propeller efficiency due to locating a pre-swirl stator array has been developed by applying linearized lifting surface theory. This method has been applied on general stators and in particular stators of low aspect ratio. The obtained results of the stator 1nduced velocity are in exact agreement with the low aspect ratio wing theory. Incorporating the stator-induced velocity together with that of the propeller, a new velocity field has been found which led to an improvement of propeller efficiency. Using published theoretical and experimental data of propeller characteristics. A comparison has been made between propellers working alone and those working with stators. A gain in propeller efficiency has been achieved at larger advance coefficient and hence a decrease in the required propeller number of revolutions.

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