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Home✈️Aircraft🚁HelicopterMiniature Aircraft Whiplash & Fury 55 › Fury (expert 60) Vibrations......HELP!
08-01-2007 12:27 AM  13 years ago
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hpilotrc

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NY--->>Mooresville, NC USA 8/2005

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Fury (expert 60) Vibrations......HELP!
I have a vertical stab vibration at hover (both the top and bottom of it). The horizontal could also be vibrating along with the main frame....may hear a buzzing sound when the vert stab vibrates. If I incease the headspeed it seems to go away.

I replaced the flybar, spindle, mainshaft, tail hub (out 55 thou). Checked the main blades with another set. Still have a vibration.

Any experts out there that might have an idea? Could the metal head block be bent??? I am thinking of swapping my other Fury head to see what happens. Also the tail shaft was dial indicated and showed only .0005 (5 ten thousanths) out. I didn't replace it.

I am using an OS 70SZ, CY MP3, CY blades (checked balance), Min plastic blades (may be warped). Al CNC fan.

Miniature says to run the tail blades loose so they just hold up on horizontal, and mains somewhat tighter.

Any suggestions would be appreciated!

Thanks,

Michael
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08-01-2007 12:31 AM  13 years ago
Dr.Ben

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Richmond, VA, USA

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Michael,

When I've had issues like this in the past (and you do this regardless of the model type), it's time to start swapping out subassemblies with some nice friend who will help you.

Do the head first. A bad head block won't typically cause this kind of shake, though.

Then swap out the whole boom and tail case. If that solves the issue, then you need to narrow it further to the tube, tail hub, etc, etc.

Swapping out known subassemblies is about the only way to efficiently isolate the problem AND avoid going insane.

Ben Minor
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08-01-2007 02:03 AM  13 years ago
Wyn

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Oregon, USA

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To add to what Ben already said, I had a similar problem that turned out to be a torque tube with a bow in it. An quick check is to remove the tail box and rotate the crown gear while looking at the end of the torque tube.Wyn
VoltMagic
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08-01-2007 02:18 AM  13 years ago
hpilotrc

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NY--->>Mooresville, NC USA 8/2005

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Fury problems...
Thanks for your replies. I will start by swapping the head with my other Fury....then look at the tube drive.

Michael
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08-01-2007 05:29 AM  13 years ago
xlkb

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Montana

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When I have a fin shake, I always look at the tail rotor first. I like to pull the whole tail rotor off the tail shaft and balance it like you would a plane prop, on a high point balancer. Might not be the problem, but a easy check!
John
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