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HomeScaleAircraftScale HeliScale Helicopter Main Discussion › Roban main gear/pulley one way bearing failure
02-01-2016 12:54 PM  34 months agoPost 1
Copter Doctor

rrProfessor

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

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Has anyone with the Roban scale mechanics ever experienced a one way bearing failure?
yesterday Roy (Heli143) and me took his mechanics out for a spin and during the flight, the machine appeared to lose power. at first we thought maybe the set screw that holds the small pinion/pulley to the motor may have come loose. upon inspection we noticed that turning the main rotor in either direction didn't spin the motor showing the failure of the one way/autorotation bearing failed.
anyone else experienced this?

drive a rotary, fly a rotorcraft

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02-01-2016 02:07 PM  34 months agoPost 2
TailKiller

rrApprentice

Panama City, FL

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Not yet!!! And hope I don't.. but I did notice that it was stiff and a touch rough, so I pulled it and greased it. It's much smoother and free now.

,Dennis
http://pcrcheliclub.com/
700 Astar Super Scale T-600 Bell 206 Trex 600 Naza H DX8

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02-01-2016 02:26 PM  34 months agoPost 3
Copter Doctor

rrProfessor

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

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his was always really smooth but it just let go all of a sudden.

drive a rotary, fly a rotorcraft

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02-01-2016 02:32 PM  34 months agoPost 4
old nitroman

rrVeteran

Naples florida

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Mine is smooth so far but only about 8 flights on it

E5s and E7se,and a 766, Roban bell 222 800 superscale,450 bell 4 bladed head,gobby 380and 420 ,180cfx

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02-01-2016 03:33 PM  34 months agoPost 5
Copter Doctor

rrProfessor

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

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mine has about the same but Roy's has only about three. That worries me.

drive a rotary, fly a rotorcraft

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02-01-2016 03:53 PM  34 months agoPost 6
Keygrigger

rrVeteran

Mississauga, Ont. Canada

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That's not sounding good, Emile. It's fortunate that you were able to get it back to the ground in one piece to do the inspection. What lube was used on it and is it the same manufacturer as the one in your AS350? Is there a chance that the spot on the shaft where the bearing grabs is slightly smaller in diameter though it would need a large variance to have it collapse the cage that holds the pin bearings in place. Take care.

Don

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02-01-2016 03:54 PM  34 months agoPost 7
MattJen

rrElite Veteran

UK

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There was a few cases where the hole in the mainshaft that secured to hub and gear was slightly off centre on some of the first mechanics, when the screw was tightened it could cause the hub to pull over and cause the gear to run out. Mine was on a 429 and I was sent a replacement gear and main shaft and gear hub.

Hopefully your issue if not connected to anything above is a one off.

Matt

All The Best

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02-01-2016 04:03 PM  34 months agoPost 8
Heli143

rrElite Veteran

Phenix City, Alabama

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I have an email out to Roban directly regarding the issue.

The mechanics have been flawless up to now so I'm very disappointed.
As weird as it may sound, I told Emile I would have been less upset if I had crashed due to little stick time than to have a fairly new component fail like that.

I have sent two customer requests to RCA in the last few weeks and have not received any response.
I've been a strong supporter of RCA and in the past they have always been very responsive so I'm wondering what is going on.

Roy Mayoral

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02-01-2016 04:38 PM  34 months agoPost 9
flyawayed

rrVeteran

orlando , fl .USA

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I've found that if the one wish isn't packed well with a bearing grease the bearing can get stuck out and not Inguage to the shaft.

edward lopez sanchez

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02-01-2016 04:48 PM  34 months agoPost 10
Heli143

rrElite Veteran

Phenix City, Alabama

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would that also cause it to grab and let go intermittently?

now I should say this one started with a clicking noise and after it let go it sounded broke, if that makes sense.

Roy Mayoral

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02-01-2016 04:56 PM  34 months agoPost 11
Heli143

rrElite Veteran

Phenix City, Alabama

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Hopefully your issue if not connected to anything above is a one off.
Matt, Emile said the same thing as of all the Roban helis he knows of no one has reported this issue thus far.

Roy Mayoral

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02-01-2016 06:31 PM  34 months agoPost 12
Heli143

rrElite Veteran

Phenix City, Alabama

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Ok, I have to eat my words now

someone I have never heard of before just called me from RCA regarding the one way bearing as well as my previous order. I think this person is new and as with any business, there are personnel changes sometimes.
I feel better now

Roy Mayoral

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02-01-2016 06:33 PM  34 months agoPost 13
206 pilot

rrVeteran

,Long Island,

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Funny you say that Roy about RCA, I called the 2 weeks ago some guy answered and said a tech was on the phone and he will call u right back, let me have your phone number, needless to say it's been 2 weeks were is the call back?? Typical.. Rich

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02-01-2016 07:12 PM  34 months agoPost 14
Heli143

rrElite Veteran

Phenix City, Alabama

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Rich, it took about two weeks for them to call me and it appears they have a new tech working there now.
The guy I spoke to was named Ed. He was very nice and discussed the item with me and they're sending me a new part from my previous order free of charge.
Try calling back and ask for Ed. He seems to know what he's talking about and he was very customer friendly.

Roy Mayoral

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02-01-2016 07:35 PM  34 months agoPost 15
206 pilot

rrVeteran

,Long Island,

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Hi Roy ok will do it's also possible the guy took my number down wrong but whenever I speak to the girl who answers the phone she always hooks me up and is very helpful hey RCA get her back on the phone lol.. Rich

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02-01-2016 07:37 PM  34 months agoPost 16
Copter Doctor

rrProfessor

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

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Guys the one way bearing assembly comes preassembled so there was no greasing for me to do.

drive a rotary, fly a rotorcraft

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02-01-2016 07:58 PM  34 months agoPost 17
Wemo

rrApprentice

Hampton Roads, VA

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bearing issue
I have not had this issue thus far. 700 size Ec665.

Daryl

"How high do they go? Are those things hard too fly? How much do they cost?

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02-02-2016 05:23 PM  34 months agoPost 18
TailKiller

rrApprentice

Panama City, FL

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Ok.. so the Goblin 700/770 main shaft is a direct fit replacement for the Roban shaft?? I noticed that the top of my roban shaft was cut at an angle.

,Dennis
http://pcrcheliclub.com/
700 Astar Super Scale T-600 Bell 206 Trex 600 Naza H DX8

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02-02-2016 09:05 PM  34 months agoPost 19
Heli143

rrElite Veteran

Phenix City, Alabama

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I was told that the early version of the Roban shafts were done with too soft a metal and they bent easily...

that being said, my tail rotor shaft got bent during a minor crash (thank you Emile for finding that during post-crash inspection)... I was told the Align 600/700 tail rotor shaft is the same size to use as a replacement except for possibly having to grind the flat spot on it.

I should mention that purely as a personal choice I replaced my swashplate with an Align 700 swash. nothing was wrong with the roban swash so please undestand that was a personal choice.

Roy Mayoral

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02-02-2016 09:20 PM  34 months agoPost 20
ssmith512

rrKey Veteran

Indianapolis, IN USA

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Estimating 25 or so flights on the Cobra with zero mechanical issues.

Steve

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HomeScaleAircraftScale HeliScale Helicopter Main Discussion › Roban main gear/pulley one way bearing failure
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