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Why Are Some Airplanes Called “Heavy”?

While flying into a Class Charlie airspace you’re on a four-mile final and ATC tells you “caution wake turbulence for heavy aircraft landing.” You know what to do since your instructor taught you proper wake turbulence avoidance techniques, but why are some airplanes...

What are N1 and N2 in Aviation Turbine Engines?

Most pilots are roughly familiar with the power setting principals of piston engines, and even of the power setting principals of piston engines driving constant speed propellers.  But for turbine engines, power is expressed in terms of “N1” and “N2.”  Because...