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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...

Why Are 737 Engines Flat on the Bottom?

Modern transport aircraft designers have settled on two primary layouts; engines slung beneath the wing and for smaller aircraft, engines mounted on the aft fuselage.  The most ubiquitous of these wing mounted designs is 737, but it features a distinctive flat...