What does the configuration referred to by Vs1 generally involve for most airplanes?

The configuration referred to by Vs1, which is the stall speed in a specified configuration, typically applies to a scenario where the landing gear is retracted and flaps are up. This is a crucial reference speed used when assessing an aircraft's performance, particularly its ability to maneuver safely without entering a stall under normal flight conditions.

Vs1 reflects the aircraft's minimum speed at which it can maintain controlled flight in clean configuration—meaning the aircraft is in a normal flying setup, without any landing gear or flap drag. It's a fundamental aspect of understanding stall speeds and performance during various phases of flight, particularly when the aircraft is in a climb or cruise phase where configuration impacts aerodynamic efficiency.

In contrast, other options refer to configurations that either add drag or are used during different operational stages, which do not align with the clean, specified configuration description associated with Vs1.