john - thanks for the response!
On a typical twin turbine like a king air/metro/1900, if you see a barberpole and it decreases in value as you climb, why is that the case? Is this a Vmo or an Mmo limit in this case? If its Vmo, and caused by pressure forces on the aircraft, shouldn't it go DOWN with altitude since there is less air impinging on the a/c structure?
Aerodynamics 101...thanks!
