Why does stall speed increase in a turn?

Instrument Flying - Runup.ca - A Canadian Piloting Resource

Stalling speed increases in a turn because of the increase in load factor. The airplane isn’t actually heavier. It is fake weight, but the airplane reacts to it. With more weight, fake or not, the angle of attack needs to be increased to maintain lift. Even in level flight a heavier identical airplane flying at the same speed (with increased power) will need to fly at a greater angle of attack to maintain altitude. The greater the angle of attack the closer your are to the critical angle of attack, or stalling speed. A wing on most general aviation airplanes stalls between 16° and 18°. An identical heavier airplane, loaded with fake weight or actual weight, will reach the critical angle of attack at a greater airspeed, thus entering a stall.

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Canada Pilot Exercise 24 Insturment Flying

Objective

To learn (while flying VFR):

how to maintain absolute control over the airplane with reference only to the instruments.
about human factors that can negatively impact a pilot’s ability to control an aircraft.
about illusions and instrument failures that may occur during instrument flying and how to maintain control while experiencing them.
how to use and navigate with radio and satellite navigation systems.

Motivation

You need an instrument rating to legally file and fly instrument flight rules (IFR). However, haphazardly visual flight rules (VFR) pilots can find themselves in instrument meteorological conditions (IMC). With the proper instrument knowledge and training, a pilot can avoid potentially fatal situations in IMC. Furthermore, knowledge of a series of radio and satellite navigational aids will give pilots more navigational confidence on long distance flights and (hopefully) prevent them from ever getting lost. Your instruments want to talk to you. Learn how to “speak instrument” so you can hear what they are saying. This skill will help you to avoid falling prey to various illusions.