Bristol Posted August 28, 2006 Report Share Posted August 28, 2006 Is it true that the Enstrom is not susceptible to Ground Resonance? (As in the 280 FX). Is it a true fully articulated rotor system? What's the deal? Someone clue me in.In my first 20 hours of training, Ive experienced ground resonance a few times (one or two times may have been my imagination..but I got it off the ground anyway). An inquiring mind wants to know. Bristol Quote Link to comment Share on other sites More sharing options...
500pilot Posted August 29, 2006 Report Share Posted August 29, 2006 Whoever said that needs to read this report. I talked with the former pilot (right before accident) and it was ground resonance. BTW, the 480 is the same rotor as the F-28, I've flown em both. http://www.ntsb.gov/NTSB/brief.asp?ev_id=2...01290&key=1 Quote Link to comment Share on other sites More sharing options...
flingwing206 Posted August 29, 2006 Report Share Posted August 29, 2006 Trust me - the first time you experience actual ground resonance, you will not wonder if it was ground resonance. Remember the term "divergent oscillation"... If it isn't divergent, it isn't resonance, just oscillation. Anyway, an Enstrom is definitely susceptable to ground resonance - especially with the hydraulic dampers. Most likely you experienced good old "Enstrom Jackhammer", where a steady oscillation gets quite rough on pickup (in the brief moments as the skids begin to lift off). This is often a track & balance issue. Great birds, though, one of my top favorite piston helicopters. Quote Link to comment Share on other sites More sharing options...
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