Does anyone have a paper that investigates different configurations of a pusher prop behind a highly streamlined fuselage? My question is about the spinner/hub configuration. Assuming that cooling flow is not routed through the spinner or an annular slot because the application is motor glider what is the best design of the spinner?
Looking at the prop itself and thinking that the spinner area of a prop is a bunch of infill of flow as opposed to actual thrust it seems that the spinner could be conical, elliptical cone, cusped elliptical cone, cylindrical, cylinder with spoiler edge, truncated cone varieties, yadda...
So there are two cases, under engine power; and folded during gliding. It seems to me that under power is not as critical as folded. So the spinner shouldn't decrease the thrust/prop efficiency and it should minimize drag during gliding. I think I can assume that there is nothing even slightly laminar going on back there.
Looking at the prop itself and thinking that the spinner area of a prop is a bunch of infill of flow as opposed to actual thrust it seems that the spinner could be conical, elliptical cone, cusped elliptical cone, cylindrical, cylinder with spoiler edge, truncated cone varieties, yadda...
So there are two cases, under engine power; and folded during gliding. It seems to me that under power is not as critical as folded. So the spinner shouldn't decrease the thrust/prop efficiency and it should minimize drag during gliding. I think I can assume that there is nothing even slightly laminar going on back there.
