Retreating blade stall has been a point of misconception with the advent of the modern higher disk loading rotor systems. In the H-53 series we were provided with an Incipient Blade Stall Chart that provided the pilots with a maximum KCAS for every weight altitude combination. The essence of this chart was to provide the pilot with a set of limiting conditions that would reduce wear and tear on the dynamic components. The machine would actually talk to the crew in the form of increased vibrations, if you exceeded these limits, The same was evident if you maneuvered the machine excessively at any given weight altitude combination. The mark one butt could feel it if you got too aggressive.
