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Home › ✈️Aircraft › 🚁Helicopter › e-Elec-Helicopters New or Limited Activity › Beam › How much vibration is normal?
09-16-2009 06:06 AM  11 years ago
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MtnMac

rrNovice

Roseville, CA, USA

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How much vibration is normal?
The Beam is my first 450. Still sorting out setup issues. Tonight I removed the main blades and spun it up. Starts smoothly, passes through a rough patch, then smooths out at about 40% headspeed and stays smooth — barely any vibration, just a faint buzz in the tail.

As it spins down, it passes again through the rough patch where it gets growly sounding, I'd guess around the main gear. In that range, the tail gets funky, too, kind of wagging (I have it sitting on a turntable to observe this). Below the growly zone, it smooths out and comes to a stop.

What parts cause vibration, and how much is acceptable? My guess is that the growl is from a harmonic resonance where several different vibes get together, then separate as the headspeed changes, which changes the frequencies. But what's vibrating? All my shafts and tail are straight, everything's oiled, all the parts move freely including the belt spindles. And you know the vibes aren't because of cheap parts.

Where should I be looking?

Thanks!Skids
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10-05-2009 03:14 AM  11 years ago
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rocco.sj

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California,

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check your pinion gear and make sure its not too tight.also check your main blades,make sure its balanced.if your running new carbon blades then you should be fine on that issue,but check the main gears also.sometimes when the main gear is kind of warp,or slightly mis-deformed it can cause that noise your hearing.i usually dis-assemble my helis after 20 flights of 3D.JR Americas
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