航空用Propeller模型試験装置附二三の觀測の結果

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  • Description of the Air Propeller Testing Dynamometer and Some Testing Results

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説明

The Nagoya works of Mitsubishi Aircraft Co. have a wind tunnel of 2 metres in diameter. This report describes the details of construction and the method of measurement of the apparatus for testing air propellers in the wind tunnel and is supplemented with some measured results of testing by using this apparatus. The measured results can be summarized as follows : 1) Propeller efficiency and number of blades. Metal propellers of 2 and 3 blades and wooden propellers of 2 and 4 blades with the same blade from in each group were tested. The results of measurements show that in the metal propellers the difference of the efficiencies between the two and three bladed propellers is small, but in the wooden propellers the difference of the efficiencies between the two and four bladed propellers is noticeable. The efficiency of the four bladed wooden propeller is inferior by about 5% to that of the two bladed propeller. 2) Propeller characteristics in yaw. Two bladed metal propeller acting in the inclined wind was tested. The inclination of the wind against the propeller axis was up to 25°. The result of measurements shows that the effect of the inclination of the propeller axis against wind is small and can practically be neglected ; that is, if we take the component velocity of the wind along the propeller axis as the advanced : ve1ocity of the propeller we always get about the same characteristics for that propeller.

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