Abstract
We examined the drag and thrust efficiency of two airship models with a stern propeller. There is a interaction between the airship hull and the propeller. To obtain an understanding of the interaction, we measured the form drag of the airships with and without a propeller, and calculated the propeller efficiency and the total efficiency of airships. We also compared the results for two airships. Furthermore we carried out inviscid computation for the effect of the propeller on airship efficiency. It was clarified that there are two patterns for the direct effect of the propeller on the pressure on the hull surface. One is good for the airship hull and the other is undesirable.
