Positive Rate
Launching into instrument conditions usually is a busy time, especially for the single pilot. When ceilings are low, the almost-immediate transition from conducting a takeoff visually to flying the airplane on instruments can be very demanding. The airplane is at its heaviest for this flight and at a relatively low airspeed, plus were trying to do many things at once, including navigating, communicating and aviating. Doing it without any reference to the natural horizon means we can be at our busiest for normal, non-emergency operations.