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Kasama Srimok 90 > Need help with Srimok vibration
 
 
Tommy8275
Senior Heliman
Location: Nashville, TN

My Posts This: Topic  Forum		I need help I just finished my Srimok and start up last weekend I note my tail fin and tailboom support was vibration . Second problem my motor was quit as soon it lift off from the ground ( approximately 45%- 48% )been change glow plug couple guy tried to help but got no luck . Would you tell me what cause these? Motor New YS SR SB19. Is that any issue at the fuel line I ran fuel magnet clunk.

Tommy K
10-14-2009 04:05 AM
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TmMugen
Key Veteran
Location: Tiny Little Red Dot aka Singapore

My Posts This: Topic  Forum		Set your idle first to perfection.

What I did was:

Close the idle needle all the way and turn it up by bits to get the perfect idle. The rest is as per normal. The important note is to get a perfect idle and the rest will follow suit.

In addition I think your mid range might be too rich and it could be the reason that your engine quits at 45%..

Roger's Crash Counter: 09 last dated 1 Sept 2009. Why I can't do 3D?
10-14-2009 04:31 AM
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SJo1
Heliman
Location: Finland

My Posts This: Topic  Forum		Or your fuel line is in pressure nipple, instead of fuel feed nipple.

Tried this and result was same

Thanks TmMugen for the tips

That was the normal prosedure how I setup the engine.

-Samppa
10-14-2009 07:16 AM
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Tommy8275
Senior Heliman
Location: Nashville, TN

My Posts This: Topic  Forum		What about the vibration at the tail fin and tailboom support?

Tommy K
10-14-2009 01:36 PM
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Asid
Senior Heliman
Location: uk

My Posts This: Topic  Forum		Hi

A badly set engine will give you vibrations on the tail fin and boom supports as well.

Your engine should start to smooth out when it breaks in .

Hope this helps

If it ain't broke then break it.
10-14-2009 02:07 PM
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Tommy8275
Senior Heliman
Location: Nashville, TN

My Posts This: Topic  Forum		Thank, I will start to break in this engine tomorrow. And will let you guys know whats going

Tommy K
10-14-2009 08:57 PM
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Tommy8275
Senior Heliman
Location: Nashville, TN

My Posts This: Topic  Forum		Now engine was run really smooth, but still have vibration from the boom support/ Fin. Also I note I hade alot of foam inside my fuel tank mm alot. affraid to take off and try to flip

Tommy K
10-22-2009 01:38 AM
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SJo1
Heliman
Location: Finland

My Posts This: Topic  Forum		I would replace tank surrounding rubber to Avant Aurora rubber. This sorts tank foaming.

Vibration could be caused from many reasons.
- different size o-ring holders in head hub, causes head to wobble in certain HS.
- counter gear mesh adjuster is not middle, causes that Output shaft not in center of tail boom holder, leads to torque tube twist and this can be the reason to the tail blurr.

Source of these symptons/fixes, see the previous posts in this forum, kasama section.

I hope that these will sort out your issues with Srimok.


-Samppa
10-22-2009 04:55 AM
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racemwyatt
Heliman
Location: Oklahoma City

My Posts This: Topic  Forum		STOP! Why is everyone saying to replace the tank rubber with Avant tank rubber? That doesn't fix anything! Don't bandaid the result of a problem; find the root cause. My tank was foaming during the maden flight. Then I fixed the problem! I had excessive side-to-side play in the blade grips and spindle, added two small shims and all vibrations went away. Tank as smooth as glass. The Srimok is a fine machine, well designed and engineered. No need to re-engineer!

I told my parents I wanted to be a pilot when I grew up, they said I can't do both!
10-27-2009 02:07 AM
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SJo1
Heliman
Location: Finland

My Posts This: Topic  Forum
Quote 

STOP! Why is everyone saying to replace the tank rubber with Avant tank rubber? That doesn't fix anything! Don't bandaid the result of a problem; find the root cause. My tank was foaming during the maden flight. Then I fixed the problem! I had excessive side-to-side play in the blade grips and spindle, added two small shims and all vibrations went away. Tank as smooth as glass. The Srimok is a fine machine, well designed and engineered. No need to re-engineer!

Could you shed light on these:
-shim size used?
-Your weathering shaft length? 91.85mm - 92.15mm

See my post: http://rc.runryder.com/helicopter/t...?top=1256658218

I didn't have time to source any shims, so I shortened several shafts to be "right" length.

I find that those o-ring holders in head hub were different size. Ordered a new set, those were proper pair.

Engine is beeing run smooth all the time (took it out from my Freya Evo.)

-Samppa
10-27-2009 04:52 PM
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Kasama Srimok 90 > Need help with Srimok vibration
 
 
racemwyatt
Heliman
Location: Oklahoma City

My Posts This: Topic  Forum		Sorry, i didn't measure the feathering shaft nor the shims. I just used the spare shims i had from my Synergy N9.

I told my parents I wanted to be a pilot when I grew up, they said I can't do both!
10-27-2009 05:00 PM
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Experience RC . Heli-Max . Hobby Hut

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Kasama Srimok 90 > Need help with Srimok vibration
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