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HomeAircraftHelicopterMiniature Aircraft Whiplash & Fury 55 › damaged rubber dampers + uniball
11-04-2004 08:30 PM  13 years agoPost 1
Knud Pedersen

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Denmark - Europe

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Hallo

I have a Fury Extreme:
Just found out that the rubber dampers (#546-16) between the clutch and the Fan is damaged – course there I some freeplay between the rubber dampers and the drive pin´s.confused:

After taking out the engine, I also noticed that the delrin (uniball) has some vertial freeplay too !!!??? (I think I can remember that the uniball was tight when it was new….)confused:

The Extreme has flown aprox. 120 flights,,,,,,
1. is¨t it a bit soon for the dampers to quit ??? (or have I a bad running Fan???)
2. What about the vertical freeplay on the uniball???:

confused: confused:

ChopperKnud
Team Miniature Aircraft
ThePitchbrothers

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11-04-2004 09:13 PM  13 years agoPost 2
mrNoodles

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Borlänge, Sweden

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Misaligned engine?

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11-04-2004 09:20 PM  13 years agoPost 3
rckrzy1

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Hurst Texas

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120 flights I would say is normal wear and tear. As for the uniball,
remove it and install upside down, it will tiggten it right up.



Wildcat Fuels

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11-04-2004 11:00 PM  13 years agoPost 4
EricLarson

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Atlanta, GA

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The #1 reason for the dampeners wearing out and the delrin ball is that the fan is out of alignment. It is very important to dial indicate the fan when you install it and dial it in to 1 or 2 thousandths. I usually can get them to less than 1 thou.

If you don't dial indicate, you may get lucky.. but maybe not. Also if you crash I would check the crankshaft and fan. I often find that people have a bent crank or the fan alignment changed, due to the crash.

The only reason I change the dampeners in my heli's is old age. The uniball should not wear out very often at all.

Good luck,

Eric

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11-05-2004 09:04 AM  13 years agoPost 5
cjw

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UK - Cheshire

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120 flights I would say is normal wear and tear.
I agree with rckrzy1, I replaced my rubbers at 128 flights when I changed the engine. They had just worn down. My fan etc had been dial indicated and there was no vibration in the heli.

Clive

http://www.cjwoods.com

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11-05-2004 09:52 AM  13 years agoPost 6
tommy

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Norway

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I checked my rubbers on top of the fan, and it was worn on one side, and compete new on the other side. It was worn on the side from my starter, but fine on the side that the engine uses.

I had some problems with hydra-lock, and have probably worn it out when trying to start it then.

/Tommy

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11-05-2004 09:53 AM  13 years agoPost 7
Knud Pedersen

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Denmark - Europe

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1-2 thousandths
Eric Larson:
The 1-2 thousandths is that 0,001-0,002 inch. or 0,001-0,002 millimetres???
And where is it measured??

--------------------------------------------------------------------------------------------

I have installed the Cooling-fan on the engine as describe in the manual.(where there is nothing written about align-measuring)
I have measured the concentricity (inside the Collin fan, at the "point of contact" approx. 3.75-4.0 mm below the top surface of the fan hub, where the Delrin ball will be installed) with a dial gauge.
The concentricity is 0.08 mm .

How can I make that better ???? The Fan will “automatically self align” because of the two cones!!!(maybe??)

ChopperKnud
Team Miniature Aircraft
ThePitchbrothers

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11-05-2004 10:01 AM  13 years agoPost 8
mrNoodles

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Borlänge, Sweden

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Im quite sure Eric is talking inches, which would be the same as less then 0.025mm (0.001inch).

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11-05-2004 10:20 AM  13 years agoPost 9
Knud Pedersen

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Denmark - Europe

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I'am not sure - but i think my rubbers was/is worn the same way as Tommy descreid:
it was worn on one side, and compete new on the other side. It was worn on the side from my starter, but fine on the side that the engine uses
My engine is a OS91sxh C-spec PS – and I really have some hydra-lock to!!!!

ChopperKnud
Team Miniature Aircraft
ThePitchbrothers

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11-05-2004 10:28 AM  13 years agoPost 10
cjw

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UK - Cheshire

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I had some problems with hydra-lock, and have probably worn it out when trying to start it then.
Good point. I had a few of those as well, especially with the OS91 / MP2 combo as it hydro locks for a pastime

My rubbers were worn evenly on both sides though.

Clive

http://www.cjwoods.com

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11-05-2004 11:08 AM  13 years agoPost 11
Knud Pedersen

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Denmark - Europe

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How do a align the Fan within <0,025mm????
And where should a measure??( where the uniball is to be placed???)

ChopperKnud
Team Miniature Aircraft
ThePitchbrothers

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11-05-2004 01:15 PM  13 years agoPost 12
Sale7

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Kuwait

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u have to do engine allignment

Please Fasten ur Seat Belt !

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11-05-2004 02:09 PM  13 years agoPost 13
DS 8717

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I had a problem aligning my fury without grinding the slots longer, so i could move the clutch a little so it would align with the motor. it was off quite a bit. I have heard of a lot more people with the same problem. DOUG

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11-05-2004 02:18 PM  13 years agoPost 14
vetrider

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Daleville, AL (Ft.Rucker)

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There is an artical on FAN ALIGNMENT put out by Ben Minor that David Harkey posted HERE

ALSO, Check out the Videos at this site.
Set-ups

Nolan

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11-05-2004 02:31 PM  13 years agoPost 15
mrNoodles

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Borlänge, Sweden

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Thats a great article, thanks Nolan for enlighteningen us and David for writing it and Ben for sharing his setup tips.

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11-05-2004 03:36 PM  13 years agoPost 16
vetrider

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Daleville, AL (Ft.Rucker)

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Thank you,

Always glad to help.

Nolan

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11-05-2004 05:45 PM  13 years agoPost 17
EricLarson

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Atlanta, GA

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Thanks Nolan,

What David explained is exactly what should be done. I have seen fans off by as much as .008 and that is a huge problem. It will eat dampeners in less than 1 gallon. If the fan is less than .003, you may think it is nice and smooth but you would be very suprised at how many problems that will cause down the road. There is only 1 way to know for sure, a decent dial indicator.

The dampeners will get old over time and need to be replaced. But not very often.

Hydrolock will probably not damage the dampeners. But it WILL destroy your motor. It damages the oil bearings on the crank, and bend the connecting rod, and stresses all of the motor parts. Always clamp or close your fuel line to the carb when filling the tank. Also don't overfill the tank as it will put gas in the muffler and that will cause the hyrolock.

Another hint is that if the engine will not align and the heli is used and has been crashed, the frame channels are probalby bent some. If the frame channels are bent, the engine will never align right. Frankly though, dial indicating the fan is more important that engine clutch stack alignment in my opinion.

Hope that helps some,

Eric

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