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Miniature Aircraft Whiplash & Furion 6
› Need help with a vibration issue with Furion 6
02-21-2013 07:11 PM  5 years agoPost 1
zeta30

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Portland, OR

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I'm having a vibration issue with my FBL Furion 6. It was caused by a semi failed auto rotation attempt where the blades hit the ground, but the heli did not tip over. The vibrations are more prevalent in the skids than the tail.

I believe I have tracked the issue down to drive system as when I am hovering I can see the vibration but as soon as I hit the TH it goes away.

I have replace almost every moving part in the drive system including:

All bearings, feathering shaft, main shaft, (although the two shafts did not appear to be damaged), I have replaced the main gear as well. I have tried a different set of main and tail blades and even replaced the belt. I also tore apart the motor and replaced the bearings in the motor as they were pretty notchy. Also bought a new head block just in case the impact bent it. The only part I haven't replaced is the OWB, but it seems to not be damaged.

Although I didn't really crash, the impact was hard enough to tweak the frame and cause the frame not to be square. I was able to fix this issue by loosening all the screws to allow the frame to go back to being square and tightening them up again.

Would it be worth replacing the OWB or does anyone have any other ideas?

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02-21-2013 07:18 PM  5 years agoPost 2
robv

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SoCal

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YES
In most cases, I replaced the OWB with the main shaft. What head speed are you running?

Team JR | Gens Ace | YS Engines | Scorpion Motors | Pure Tech

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02-21-2013 10:41 PM  5 years agoPost 3
zoomtt

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corona,CA

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do you have vibration when you remove the main and tail blades and spool the heli on the ground?

Edsel Labao
Team Horizon Hobby - YS Engines - KDE Direct - Switch Blades

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02-22-2013 12:20 AM  5 years agoPost 4
zeta30

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Portland, OR

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do you have vibration when you remove the main and tail blades and spool the heli on the ground?
- Edsel
Team Horizon Hobby
Team Gens Ace USA
I do have vibes with out any blades. I even removed the tail and boom completely and spooled up with only the head spinning and the vibration is still there.
YES
In most cases, I replaced the OWB with the main shaft. What head speed are you running?
Rob V.
Team Miniature Aircraft USA | Mavrikk Blades
Team Gens Ace USA
Team MKS Servos USA
I was kind of thinking that as it is the only part I haven't replaced.

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02-22-2013 12:32 AM  5 years agoPost 5
Raptorz499

rrKey Veteran

NJ

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Possibly the motor?

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02-22-2013 03:37 AM  5 years agoPost 6
kiddynamite

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Ithaca NY

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f6 problem
Replace the head block. I had the same problem with mine after a crash. took the head off of my fury55 and put it on the f6 and the problem went away. Took the f6 head on my 55 and could barely see it vibrate because of the low head speed,but it did vibrate.

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02-22-2013 03:46 AM  5 years agoPost 7
hootowl

rrProfessor

Garnet Valley, Pa.

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Check for a crack in the frame. Sometimes around where the main shaft bearing blocks are. Not necessarily this heli. I had that happen to a gasser I had. Took the person that bought it from me to figure it out.

Wolves don't lose sleep over the opinions of sheep

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02-23-2013 05:41 PM  5 years agoPost 8
mikez19

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North West Hills Connecticut. USA

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With no vibration in throttle hold,which removes the motor. I suspect maybe the motor shaft and/or other motor components being you replaced the bearings.
Best of luck.

Mike

Those who say, "it can't be done", should not interrupt those, "who are doing it

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02-23-2013 06:00 PM  5 years agoPost 9
zeta30

rrNovice

Portland, OR

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With no vibration in throttle hold,which removes the motor. I suspect maybe the motor shaft and/or other motor components being you replaced the bearings.
Best of luck.

Mike
I forgot to add that I replaced the motor shaft when I replaced the motor bearings. I think you are on the right track though because the only thing that stops spinning when I hit the TH is the motor. I just don't want to spend over $100 for a new one to find out it didn't solve the problem.

The exception to the above the OWB still spins but isn't driving the shaft so I'll get an order out for a new OWB next week and try that, if that doesn't I think I'll try to get a cheap motor and try that just fr trouble shooting purposes.

I also forgot to add my head speed is 2200.

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02-23-2013 06:49 PM  5 years agoPost 10
mikez19

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North West Hills Connecticut. USA

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I do not believe the OWB is spinning with TH engaged only the main shaft spinning inside the OWB installed in the main gear. So in TH you are correct in the fact that the OWB is not driving the main shaft. I believe it's possible the OWB could be the problem when it is engaged driving the main shaft. You might also consider removing the motor and spinning it up on the bench to see how much it vibrates.

Mike

Those who say, "it can't be done", should not interrupt those, "who are doing it

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02-24-2013 10:34 PM  5 years agoPost 11
zeta30

rrNovice

Portland, OR

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I do not believe the OWB is spinning with TH engaged only the main shaft spinning inside the OWB installed in the main gear. So in TH you are correct in the fact that the OWB is not driving the main shaft. I believe it's possible the OWB could be the problem when it is engaged driving the main shaft. You might also consider removing the motor and spinning it up on the bench to see how much it vibrates.

Mike
You're right, I was having a brain cramp when I posted my comment about the OWB spinning.

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Miniature Aircraft Whiplash & Furion 6
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