In Lee Smiths April 2014 article on Visual Area Protection, I think there is an error. The diagram indicates that the 20:1 slope is the same as standard three degree VDA. My memory, Lee Smiths original Danger Below MDA? from March 2013, and my math indicate that 34:1 is the same as a three degree slope.
A 20:1 slope, commonly used in aviation, calculates to approximately 2.86 degrees, often rounded to a standard three-degree visual descent angle (VDA).
Effective NEXRAD radar interpretation requires considering factors beyond color intensity, such as cell movement, changes in intensity over time, type of precipitation, data delays, and altitude, to avoid overly conservative flight decisions.
Maneuvering speed (Va) decreases with aircraft weight because lighter aircraft fly at a lower angle of attack for a given speed, allowing them to withstand higher G-forces (turbulence loads) before stalling, thus protecting the wing structure.
ARCTAN(Height/Base)=Angle In Lee Smith’s April 2014 article on Visual Area Protection, I think there is an error. The diagram indicates that the 20:1 slope is the same as standard three degree VDA. My memory, Lee Smith’s original “Danger Below MDA?” from March 2013, and my math indicate that 34:1 is the same as a three degree slope.
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