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Revolution Models . CarbonXtreme . Midland Helicopters

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JR Heli Vibe - Airskipper - Sylphide - Venture > Good clutch bell align = no resonance, humming noise or vibrations.
 
 
3Dx
Elite Veteran
Location: Monterrey NL

My Posts This: Topic  Forum		Hi Guys..

I noted that my Vibe was totally free of resonance on till I removed the engine and mount it agene, after this my heli started with vibrations and humming sound. So I went deep to investigate.

I removed the main blades, tail blades and started the engine on the bench and found the clutch bell was vibrating making the humming sound.

http://www.youtube.com/watch?v=4O9X-4702hg&feature=user


I was able to fix the problem balancing and dialing indicating the clutch, fan and all the assembly.

The critical part is to perfectly aligned the “engine and clutch assembles” and “clutch bell assemble”. If this two assembles are 100% concentric, parallel or balanced it will work perfect.

If the assembles are not 100% aligned when the clutch expands it will result on this:

http://www.youtube.com/watch?v=r5uIr9UQRB4



Adding a bearing will help to automatic align the assemblies and will reduce the possibility to run like the SolidWorks video.


Just a View.

Bad aligment.

This is normal for a One-Way Bearing

A little help to align easily.



Tony and I have been talking about this, he has some experience with his Heli that will post soon and he will also proportion a better quality video. Thanks Tony!
06-29-2008 Over year old.
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3Dx
Elite Veteran
Location: Monterrey NL

My Posts This: Topic  Forum		I tested using the extra bearing on my heli and it was so easy to align the assemblies and no resonance or vibrations at all.
06-29-2008 Over year old.
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tchavei
rrProfessor
Location: Portugal

My Posts This: Topic  Forum		I specifically had these two bearing fail (not sure if after a crash or normal wear) but during the time I had the "humming" noise, I know these two bearings were "gritty". I replaced both of them and this time I CAREFULLY aligned the engine and clutchbell and no humming since. Your solution seems to assure the alignment is spot on without much hassles.



Tony


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"Perfection and patience usually walk side by side..."
06-29-2008 Over year old.
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tchavei
rrProfessor
Location: Portugal

My Posts This: Topic  Forum		Here are 3Dx's videos in higher quality (you can see the clutch bell rattle on the left side)

http://www.skynetlabs.org/diversos/PICT0135.MOV

http://www.skynetlabs.org/diversos/PICT0141.MOV

Tony


--------------------
"Perfection and patience usually walk side by side..."
06-29-2008 Over year old.
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Foxden
Key Veteran
Location: Port Charlotte, FL. USA

My Posts This: Topic  Forum		Did the oneway need to be lowered in the clutch to add the 2nd bearing?

Clyde Fox
Port Charlotte FL
Team Outrage
06-30-2008 Over year old.
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mdu6
Key Veteran
Location: Montreal

My Posts This: Topic  Forum		I don't see where that bearing could be fitted, the one-way in the clutch is already align on top of the clutch ... are you driving it 3mm down to fit the bearing ??

Also, there is a K&S pinion that has an additional bearing on top to also help maintain the start shaft (K&S1100 10T and K&S1101 9T).

I wonder if it would fit the Vibe ?
06-30-2008 Over year old.
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inkspot1967
rrProfessor
Location: cranston ri.

My Posts This: Topic  Forum		look in the last pic it shows the oneway pushed down a little bit a bearing added on top

Crashing hitting the ground is easy...Hitting the windsock takes skill..!
FBH Synergy N9
Rave
06-30-2008 Over year old.
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3Dx
Elite Veteran
Location: Monterrey NL

My Posts This: Topic  Forum		Yes Guys, the oneway need to be lowered down 3mm
06-30-2008 Over year old.
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dhc8guru
Senior Heliman
Location: Texas

My Posts This: Topic  Forum		Thats a nice tip.. but I am going to stick to my old tried and true method. You can tell when everything is lined up properly, when the main gear is rotated, the start shaft doesn't rotate. The only flaw in your method is the 3mm drop of the one way bearing. The problem with one way bearing is a majority of the bearing surface needs to bind on the shaft. If say only half of shaft goes into the bearing, it will damage the bearing cage and cause the needle bearings to no longer grab onto the shaft.
Its a pain in the arse but its just the way it is.
06-30-2008 Over year old.
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Spacey
Veteran
Location: Pretoria, South Africa

My Posts This: Topic  Forum		Saweeet! Thanks for the info guys. I don't think many folks take the needed time to align clutches and things properly, but we've learned the hard way on our .90 F3C models that those 10 minutes spent to make sure it's properly aligned left/right/front/back will save you a looootta trouble later with vibes and funny noises especially inside a fuselage.

The extra bearing is something I'll definitely bare in mind should the problem show it's ugly head. You guys rock!
06-30-2008 Over year old.
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mickeyapples
Veteran
Location: England

My Posts This: Topic  Forum		can some one explane how to properlly align an engine and clutch, which tool are needed and some pictures if possible.

Please

Live life on the edge. Stand next to me when I am flying
06-30-2008 Over year old.
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tchavei
rrProfessor
Location: Portugal

My Posts This: Topic  Forum		Nothing special is needed. WHhat you need to watch for is that the bottom of the clutch aligns perfectly with the bottom of the clutchbell in every possible position. A small ruler will help you to make that alignment. Once its perfectly aligned, start to tight down the engine mount and keep checking if everything remains true. If you want to take it further, you can also rotate the start shaft by hand and feel any resistance. When the engine is perfectly aligned the start shaft moves completely free without any drag.

Tony


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"Perfection and patience usually walk side by side..."
06-30-2008 Over year old.
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Dr Lodge
Elite Veteran
Location: Guildford, Surrey - UK

My Posts This: Topic  Forum		I find the "mark I eye ball" to be the best tool - I spent ages getting it right with my Vigor CSs, looking up and down the crankcase/clutch/start shart you can see even minor deviations. Then rotating the start shaft to make sure everything is smooth is a final check.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200
06-30-2008 Over year old.
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Spacey
Veteran
Location: Pretoria, South Africa

My Posts This: Topic  Forum		Ditto. Just eyeball it from the side/front as best you can. It takes a little practise and like Tony said start tightening down things little by little making sure everything stays perfect. Sometimes it can be a pain but it's important. You also want to, apart from checking that everything rotates freely, make sure you don't change your gear mesh on the pinion and main gear. Also that your gears stay running parralel to each other, this is also an eyeballing feat.
06-30-2008 Over year old.
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Dr Lodge
Elite Veteran
Location: Guildford, Surrey - UK

My Posts This: Topic  Forum
Quote 
Also that your gears stay running parralel to each other

This is a good point, the one thing I was never 100% happy with on my Vigors was that the pinion and main gear didn't seem to be perfectly parallel.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200
06-30-2008 Over year old.
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Spacey
Veteran
Location: Pretoria, South Africa

My Posts This: Topic  Forum		It's one thing I hate on my Venture .90. You have to manually adjust the gears front and back to get em meshing perfectly parralel/vertically parralel/whatever way we want to put it. It's a tedious task, luckily not something you do every 5 minutes. I'm happy however that one's able to adjust these things, even if only a little as if you couldn't there could be all kinds of other headaches.
06-30-2008 Over year old.
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3Dx
Elite Veteran
Location: Monterrey NL

My Posts This: Topic  Forum		That extra bearing don’t hurt, believe me, you will save hours and hours on proper alignment.

My experience and method with this extra bearing:

Install clutch bell assembly but don’t tight bolts yet, install and tight Engine bolts, then tight clutch bell assembly and you are done. Easy as that, also expect perfect gear match.

For precision results remember we need also to dial indicate and balance clutch bell assembly and clutch, fan, hub assembly.
06-30-2008 Over year old.
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tchavei
rrProfessor
Location: Portugal

My Posts This: Topic  Forum		So now you only need to explain to us how to remove the original one way bearing without damaging it, installing the new radial bearing and the one way again

Tony


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"Perfection and patience usually walk side by side..."
06-30-2008 Over year old.
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3Dx
Elite Veteran
Location: Monterrey NL

My Posts This: Topic  Forum		Use this method:






Please don’t use this Method:



06-30-2008 Over year old.
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tchavei
rrProfessor
Location: Portugal

My Posts This: Topic  Forum		HAHHAHA

Actually I was thinking about using a tiny bit of explosive but your method seems better. I have a bearing puller (or should I say pusher) but my concern is that I could damage the clutch itself.

Tony


--------------------
"Perfection and patience usually walk side by side..."
06-30-2008 Over year old.
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JR Heli Vibe - Airskipper - Sylphide - Venture > Good clutch bell align = no resonance, humming noise or vibrations.
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