No problem with it Steve, in the real world a spinning cylinder or ball in a flow will produce lift but that is becauce it alters the direction of the fliud flow.
Altering the direction of flow is the function of a foil. By altering the direction (velocity) of the flow, lift is converted from the kinetic energy of the flow. The spinning cylinder or ball is a type of foil.
The key here is that the fluid produced a force on the cylinder or ball and the ball or cylinder provided an equal but opposite force on the fluid flowing past it.
The spinning ball alters the flow because the flow adheres to the ball on the retreating side more than on the advancing side or more than it would on a stationary example. This increased adhesion prevents the flow from separating from the cylinder, thus it follows the cylinder's surface and it undergoes a continuous change in velocity (acceleration) as it does so. Lift is a reaction to this acceleration and the boundary adhesion.
Jimbo
