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HelicopterJR Heli Vibe 90/50, Sylphide 90, GSR260 › Needs some re-assurance guys - please!
12-13-2008 09:25 PM  8 years agoPost 1
v58 fuy

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UK - Kent

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Guys,

Building my Vibe 50 (built many Raptors and Rex's before but not with adjustable gear mesh).

Anyway, dialled the fan and clutch in today, mounted the engine with everything loose to start (OS Hyper), now got it so that the engine mount is hard back against the frame, the engine, clutch, fan and start shaft are all perfect.

The clutch bell spins real free, so to does the start shaft - so I have checked the main gear to pinion mesh with a strip of paper from the manual see pics below. To me the mesh could be tighter but I'm not sure, if I did tighten the mesh everything else is likely to be a compromise - advice please guys, what's the effect if mesh is too loose?

David

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12-13-2008 09:38 PM  8 years agoPost 2
PBusch

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Minnesota

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I don't use paper so I don't know by looking at the paper. All you really need is a small amount of play at the tightest spot. What I do is first set the mesh and get the clutch bell square to the frame, you can line the side of the clutch bell up to a small section of the frame by looking through the side. Once that's done I line the motor up the the clutch bell making sure it looks square and the bell spins freely.

If you move the clutch to adjust the pinion after everything is all set then you have to re align the motor.

BTW, I've always had a hard time setting the mesh and getting the clutch bell square, it always seems like my mesh is a little on the loose side but I've never had a problem so I just left it at that.

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12-14-2008 12:18 AM  8 years agoPost 3
v58 fuy

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UK - Kent

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Originally I set the the pinion mesh without engine installed but probably a little on the tight side - paper went through but was tight going through.

When I then tried to install the engine nothing would line up, so I loosened the pinion bearing, installed the motor and adjusted everything such that it was all as best lined up as possible.

David

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12-14-2008 05:08 AM  8 years agoPost 4
Flyinhelis

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USA - So. Cal. the OC

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When you run the paper thru it should feel some resistence but not tight. The picture you show looks like the gear mesh it loose, the folds from my experiece is sharper looking rather than rounded when you have the correct mesh.

If the mesh it over tight, you will notice it when you rotate the main gear freely - it will drag.

good luck.

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12-15-2008 06:17 PM  8 years agoPost 5
tim deakin

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gloucestershire uk

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If the gears are too tight they 'could' over-heat and melt, if they are loose you are not getting the maximum strength from each tooth.

Try and imagine them at there extremes and hopfully you'll understand what I mean.

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12-16-2008 01:39 AM  8 years agoPost 6
Chris.C

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Hong Kong

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Two points about the alignment that I think important:

First one is to align the clutch to make it square with the bell, meaning the start shaft axis is in line with the crank.

Second one is to align the 3 mast bearing blocks so that the main shaft can slide thru' all blocks smoothly.

I did not try the paper thing on the mesh but it spins quite loose. It has gone through 70+ flights so far so good.

Chris

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12-16-2008 01:18 PM  8 years agoPost 7
ajnstajn

rrApprentice

Slovenia, EU

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First one is to align the clutch to make it square with the bell, meaning the start shaft axis is in line with the crank.
How do you check that without starting the motor?

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12-16-2008 06:06 PM  8 years agoPost 8
tim deakin

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gloucestershire uk

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You can see it. Look at the side of the bell housing.

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12-16-2008 10:59 PM  8 years agoPost 9
v58 fuy

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UK - Kent

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Guys,

Thanks for all your help, I sorted my gear mesh out - have everything lined up real good, start shaft turns nice by hand, clutch and bell lined up well, mesh good.

Now moved onto servo install and swashplate/linkage setup.

Will be back with further questions if needed during rest of build, but I should be fine now - just never had to do gear meshing before.

David

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12-16-2008 11:39 PM  8 years agoPost 10
tchavei

rrProfessor

Portugal

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Thats the spirit

Tony


--------------------
"Perfection and patience usually walk side by side..."

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01-07-2009 05:57 PM  8 years agoPost 11
dhc8guru

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Fort Worth, Texas

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the alignment is a pain on this Heli. I think it is like that by design, so you really can't stray to far from it being aligned.
I agree that a little loose is fine, I eyeball the pinion moving about .003 in either direction and call it good.

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01-07-2009 06:48 PM  8 years agoPost 12
AaronJohnson

rrElite Veteran

mason,MI

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I thought it was very easy and i like how you can actually adjust it, unlike some other "better" helis. LOL I think if you follow the order in the book then it is simple. Main pinion mesh, tail gearbox mesh, THEN line up the engine. I triple checked everything and so far after more then a gallon everything is perfect.

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01-07-2009 06:52 PM  8 years agoPost 13
DS 8717

rrProfessor

Here wishing i was somewhere else

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The mesh is a little loose but doesn't cause any problems.the main thing is that the engine is aligned or you will have vibrations. All the gears on the heli have a little play but it doesn't cause any problems and it is very quiet.

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