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Ground resonance in Enstrom?


Bristol
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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

 

280FX_flyby.jpg

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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.

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