DUCTED PROPELLER STUDY
EASTERN RESEARCH GROUP NEW YORK
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Various aspects of ducted propeller theory and design are considered. These include the lift of a moderately inclined ducted propeller, possibilities for increasing the static thrust, the related blading design and flow field analysis of interference with adjoining wings or bodies. The inclined duct theory is shown in agreement with several sets of test data from different sources. Large static thrusthorsepower values with low jet velocities are predicted for designs which accelerate the inflow in accordance with specified pressure changes inside the duct. These considerations are at present without experimental verification. For such flows, a range of appropriate blading designs are shown by means of solidity, pitch distribution, jet velocity and tip speed. Digital computer studies are recommended to evaluate favorable and unfavorable interference flow arrangements between ducted systems and surrounding surfaces. The fan-in-wing flow field with a jet of finite size is one of many cases which can be handled.