61.51(a) tells us that pilot logbooks are where we should record 'training time and aeronautical experience'. 61.1(b)(1) tells us that Aeronautical experience means pilot time obtained in an aircraft, flight simulator, or flight training device for meeting the appropriate training and flight time requirements for an airman certificate, rating, flight review, or recency of flight experience requirements of this part. So that right there does indeed tell us that we have to be in the plane.
Furthermore, 61.51(b)(iv) says that each logbook entry should include the type and indentification of aircraft, flight simulator, or flight training device as appropriate. Nothing in there calls out UAV's specifically. They're definitely not flight training devices or flight simulators so that leaves aircraft. Aircraft, for the FAA's purposes, have tail numbers. Do UAV's have tail numbers?
But really the more important question that needs to be answered here is WTF were you doing hanging around yahoo answers?