From: email@example.com (Julian Fitzherbert) Organization: Schlumberger Geco-Prakla Date: 03 Jun 94 14:13:36 References: 1 Followups: 1
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In article 1298@ohare.Chicago.COM, firstname.lastname@example.org (TriStar500) writes: > In article <airliners.1994.1269@ohare.Chicago.COM>, email@example.com > (i am me) writes: > > >what is the difference that causes the 2 powerplants on the md 80 to > > > >seem to be noiser than the 3 powerplants on the boeing 727??? > > That would be our old friend resonance. There's something about the > way MD hangs the engines on this airplane that does it. The DC-9 is > no better, by the way. The MD-80 has an engine sync system that is > supposed to calm this down by synching N1 or N2 of both engines. I > understand it's not used much because it actually makes things worse! > I remember that early VC10s used to have some sort of display for the flight engineer that monitored engine vibration or noise or something like that. It was a cathode tube device a bit like those radio magic tuning eye things. Anyone know what it did - I think it was an engine syncronisation system ? I don't recall seeing it in later VC10 cockpits.