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HomeAircraftHelicopterKasama Srimok 90 › What would cause a wobble at high RPMS 1750-1900?
01-23-2010 08:54 PM  8 years agoPost 1
FenderBean

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Fort Hood TX

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When I go lower the wobble stops but its not good, 1800 used to be perfect now the vibes back and fuel foam has returned?
I had it smooth as a button, im starting to think the motor being rich is causing vibrations

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01-23-2010 10:22 PM  8 years agoPost 2
bathmagic

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Berwick,Victoria, Australia

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Now you have open up pandoras box! lol.lol

what causes the vibes........

I would think to look at the dampeners in the rotor head AND the dampeners in the motor mount.

I would be certain to say after a while of flying the motor mount dampeners would get a little soft from the oil and fuel, the rotor head ones like all helis will soften and wear out too.

How many flights are on the heli fender bender ?

Dale

ENV - Still laying it down !….Ohhh yeh !!!

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01-23-2010 11:02 PM  8 years agoPost 3
FenderBean

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Fort Hood TX

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well the heli has less than 10 flights on it as I havent been able to do much other than hover around. You think a rich engine could cause this?

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01-24-2010 01:13 AM  8 years agoPost 4
bathmagic

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Berwick,Victoria, Australia

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it may be a tune issue also

try closeing your mid needle 4-6 clicks then hover and see if it changes anything, then open the neddle 4-6 turns

then you will know if its rich or lean.
its almost impossible to pick a tuning issue "On-Line"

Let us know your findings

Dale

ENV - Still laying it down !….Ohhh yeh !!!

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01-24-2010 01:44 AM  8 years agoPost 5
FenderBean

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Fort Hood TX

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well my mid is 1/2 turn from close, im running a 91 HZ-P

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01-24-2010 01:55 AM  8 years agoPost 6
bathmagic

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Berwick,Victoria, Australia

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its hard to offer advise without hearing and seeing the engine running

i would sugest you open it up half a turn then fly , if its worse then lean it but at a guess i think you may be lean

go back to the OS instructions and re read how to set on up from the start, you maybe a little too lean on the mid.

BUT theres a heap of things that alter this

hight above sea level
fuel used

etc

Dale

ENV - Still laying it down !….Ohhh yeh !!!

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01-25-2010 05:54 PM  8 years agoPost 7
hookmaker

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Copenhagen, Denmark

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Which blades do you use? If you use blades that require shims, try a set with root that fits the kasama blade holder - that has been seen to be a cause of wobble.
/henrik

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01-25-2010 06:09 PM  8 years agoPost 8
FenderBean

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Fort Hood TX

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hmmmm im running Radix blades
i will check them

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01-25-2010 07:57 PM  8 years agoPost 9
hookmaker

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Copenhagen, Denmark

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Nothing wrong with Radix in general my friend, but the Kasama head is so stiff that sometimes a blade with a root that fits is better supported. I fly CGT Extreme Ultra (same as Mavrick G4) on my bird.
/Henrik

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