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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion › Roban main gear/pulley one way bearing failure
02-21-2016 10:23 PM  4 years ago
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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well as I wait for a reply from roban about the main pulley issue, I discovered that it wasn't the bearing that was bad, its the pulley itself, seems the hole that the one way bearing is pressed into may have been machined just a fraction of a thousandth of an inch too much and the bearing was spinning inside the pulley causing the system to lose drive to the main rotor system. Roy ordered a second pulley only to discover it had issues with the way the teeth were cut, the belt was riding in and out of the grooves, I sent an email with pics to roban and pending a response. anyway, I popped the bearing out of the original pulley, saw that it is pressed in with some sort of adhesive so I replaced it with some adhesive of my own, let is sit and now it seems to be holding after a few flights. will keep it in a hover for now just in case we have to buy yet another pulley. with all that squared away for the time being, another issue has come about. seems there is a case of the shakes I cant seem to figure out where its coming from. its very rare I cant find the source of the shakes in a heli and this has been one that has me scratching my head. you name it I have checked or changed it. I did reverse the direction of the rotors when I re-installed the one way bearing in the main pulley but that cant give it the shakes can it? I am open to any ideas. I have tried three other rotor heads and all had the same shaking results exept for one, the century three bladed head I recently removed from my astar mechs ( it sports a starflex head now)
I met up with Roy this morning so he could see the shaking for himself, he also hovered the machine. so much more comfortable to fly with the right hand rotation he and I are both so used to but that shaking has gotta go.

drive a rotary, fly a rotorcraft
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02-21-2016 11:56 PM  4 years ago
206 pilot

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,Long Island,

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Maybe it's detoxing pour a little beer on the rotor head that's should take care of the shakes lol lol
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02-22-2016 12:14 AM  4 years ago
ssmith512

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Indianapolis, IN USA

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Mr E.,

I had an issue with my Cobra in that the mainshaft bearings were loose in the main plates, very similar to your one bearing issue, with the hole slightly oversized. Was causing my mainshaft to "rock" a decent amount. Sometimes I had vibs, sometimes I didnt. I used some fancy loctite bearing retainer specifically for "large" clearance gaps to set the bearings in the main plate. Seems to be working for me.

Hopefully you find the cause soon.
Steve
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02-22-2016 12:27 AM  4 years ago
Heli143

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Phenix City, Alabama

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Man I hate making Emile go crazy on my mechs, but I'm headed for California for a two week job trip and he feels bad about all the issues with the mechanics.
When I hovered them today they felt very stable and the CW rotation made me feel at home so it was very relaxing hovering it.
BUT those Damn shakes are just unresolved.

One thing we both agree on other than we both currently feel uncomfortable with CCW rotation, is that we need to overcome that.
So we will both get a CCW pod and boom heli and learn to fly both CW and CCW.
Roy Mayoral
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02-22-2016 01:09 AM  4 years ago
Mojave

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Palos Verdes, Ca. USA

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Chasing down gremlins is fun... not. I chased a vibe for weeks and finally found it. Believe it or not, my motor had a bad bearing. It was allowing the motor shaft to vibe and this vibe was just transferring itself to the airframe. So, my point being, it can be anything...
Barry
All helis and planes have an expiration date stamped on them...you only find it after you crash!!
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02-22-2016 01:14 AM  4 years ago
206 pilot

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,Long Island,

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I hear that my vibe on my 407 ended up being a twisted blade and now I had to buy 4 new ones cause kin isn't answering phone calls... Rich
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02-22-2016 02:06 AM  4 years ago
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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Steve, I am going to look into that. that sounds like a great lead. Rich, I drank all the beer so none is left for the rotor head
Barry, I am now a drowning man clutching to a straw so I am gonna check that too
Roy, I go crazy anyway, may as well be on a heli lol!!
drive a rotary, fly a rotorcraft
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02-22-2016 02:17 AM  4 years ago
206 pilot

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,Long Island,

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Lol good then your not alone lol... R
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02-24-2016 02:03 PM  4 years ago
old nitroman

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Naples florida

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I had a tt bearing walk down the boom, drove me nuts for 3 weeksE5s and E7se,and a 766, Roban bell 222 800 superscale,450 bell 4 bladed head,gobby 380and 420 ,180cfx
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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion › Roban main gear/pulley one way bearing failure
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