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Zoom › High RPM = tail vibration = gyro hunting?
05-06-2005 04:12 AM  12 years agoPost 1
BigGuyInLA

rrNovice

Los Angeles, CA

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I'm a new heli flyer, so I might be asking a dumb question, but here goes. When I set my rotor rpm (ESC governor mode) to 2300, I get a tail vibration that I can hear over the rotor noise. This seems to be causing the gyro (MS Composite Heading Hold) to hunt back and forth, moving the tail back and forth randomly by ~30 degrees.

As I lower my rotor rpm from 2300 down to 2100, the vibration lessens and the gyro hunting back and forth increases in speed while decreasing in amount. Below 2100 the vibration is mostly gone, and the gyro will hold a steady heading without hunting back and forth.

My questions:
1) Is it normal for vibration to cause the gyro to act flaky? Or does it mean the gyro is bad?

2) Is 2000 ~ 2100 rpm a fast enough rotor speed? I've read on this forum that most guys are running 2200~2300 rpm on their shoguns, right?

3) Any tricks on getting rid of (or even finding) the cause of the vibration? The weird thing is that it runs pretty smoothly up to ~2100 rpm...

Equipment:
Hitec Electron 6 Rx, four HS-56's, MS Composite Heading Hold gyro.
Regular Shogun frame, EF brushless motor w/ 9T pinion, EF 1600 mah lipos.
MicroHeli machined tail rotor gearbox, blue gears, slider and arm, blade grips.
MicroHeli machined swashplate, elevator cradle, see-saw, head and main blade grips.
Regular plastic rotor blades.

Thanks...

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05-06-2005 05:36 AM  12 years agoPost 2
dada

rrNovice

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your gyro is fine it's the vibration that's causing it act up.

Sounds like your blades are out of track. If your blades aren't swinging on the same level it will cause vibrations. Also check your main shaft and spindle shaft too. Try getting the HP Shaft and the stainless steel spindle. Those are a lot stronger then stock and don't bend as easily. The slightest bend in any of those can cause the blades to rotate imperfectly resulting in vibration.

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05-06-2005 06:06 PM  12 years agoPost 3
Hoverdown3K

rrKey Veteran

Rochester, New York

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I have noticed this with my Shogun, but ah higher headspeeds around 2700.

My shogun is in perfect shape and I do not have any bent pieces or damaged blades, the tracking is fine.

What I see happing is the tail rotor blades have allot of slop, and when spinning at a very high RPM they start to induce there own vibration. and the tail rotor blades make a weird sound over the main blades.

I can hear the failure as it happens, it is like the blades are flairing out. very strange. I think with a better rear end tail gear box / blade holders / pitch slider / rear rotor blades, would cure this.

And this causes my 401 gyro to go crazy, I lower the headspeed to 2300 to 2500 and all it fine, rock solid.

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