Hola GQ -
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I agree with you about your opinion of QNH vs QFE - yet both have to be known. Here in the Pampas, with our superior airmanship, we teach QFE for primary teaching, circuits, downwinds at 800' QFE... then we introduce the concept of QNH...
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Many places we land in the Pampas are grassy fields shared by the cows, with just a vague idea of field elevation, and no ATC to broadcast a QNH. So we depart with an altimeter set to "O" if nothing else available...
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And we have to be somewhat "educated" in physics too... At a petrol station along a country road (where you get some for your plane), they might have a barometer indicating 755mm/Hg... that is about 1006 hPa = QNH... and the attendant is willing to loan you a funnel to fill the petrol into your tank...
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Lots of old airplanes here that you would love, DH-82, SV-4, a Proctor is still active in Argentina, an old Auster AOP6 as well... seen a Fieseler Storch with Paraguay registry... plenty of subjects to talk about at the Club House in front of a lager... I used to own an ex-US Army L-21c (1952) of Korean War vintage, which had service in Bolivia, where I bought it, but forced to sell it when the 2002 banking/financial crisis hit Argentina... but I still get to fly it as the new owner is a friend, he does QNH procedures well...
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Happy contrails