If we add the cylindrical strut drag with no blades to the performance with cylindrical struts, we do not get the power coefficient of the normal configuration, which implies additional drag. This could be the effect of the corner joint between the blade and strut, where the cylinder is "blocking" some of the lifting surface of the blade.
If we add the cylindrical strut drag with no blades to the performance with cylindrical struts, we do not get the power coefficient of the normal configuration, which implies additional drag. This could be the effect of the corner joint between the blade and strut, where the cylinder is "blocking" some of the lifting surface of the blade.