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09-21-2009 04:32 AM  11 years ago
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OuttaControl

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Springfield, Missouri -United states

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Caliber 4 tail vibration
I've got a Kyosho Caliber 4 with an OS37 engine. My question is why would the tail be vibrating up and down about 1/4" at about 60% throttle? It is a very high speed vibration. Seems like below this throttle range and above it , the vibration is almost nonexistent. Any help would be appreciated
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09-21-2009 05:01 AM  11 years ago
ShuRugal

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Richmond, VA

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something is off balance and you are resonating. Is the belt tension correct? any damage on the tail blades or grips? Foreign Object stuck to TR blades or grips? something binding in the tail rotor assy?AMA 700159
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09-21-2009 06:41 AM  11 years ago
OuttaControl

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Springfield, Missouri -United states

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Caliber 4 tail vibration
I've checked everything except the tension of the belt. How much should I be able to deflect it? I was thinking about 1/4". I tipped the heli over a few days ago and damaged the main blades. Other than that it looked ok to me. Oh, also bent the flybar shaft but I replaced it too.
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09-21-2009 06:45 AM  11 years ago
OuttaControl

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Springfield, Missouri -United states

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Caliber 4 tail vibration
ShuRugal, I just checked the TR belt and it is REALLY loose. I'll retighten it in the morning and I'll post the results.
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09-21-2009 03:13 PM  11 years ago
ShuRugal

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Richmond, VA

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i don't know the specs for it, but i would expect something this small and spinning that fast to need to have minimal deflection. I would go with "as tight as possible without making it bind on the pulleys"

The drive chain on my CB400 needs 1-1.5 cm of slack, any more results in slap, any less binds when the swingarm moves. TR belt is about 1/2 or 1/3 length of a MC drive chain, and is not a chain, so i would reckon 0.5ish cm slack?
AMA 700159
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09-21-2009 07:41 PM  11 years ago
OuttaControl

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Springfield, Missouri -United states

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Caliber 4 tail vibration
I retightened the tail rotor belt this morning and worked on the engine tune. On close inspection of the tailrotor blades I found a small chip and some grass residue. I've thoroughly cleaned the blades and removed the grass residue. Am going to try to rebalance the blades and see what happens.
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09-25-2009 12:07 AM  11 years ago
heli-cuzz

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Pittston, Pa. USA

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Tail vibes
Sounds like tail rotor is out of balance. I balance the complete TR assembly using the Dubro true spin balancer. Make sure the blades are extended fully as they are in flite.
You mentioned you tipped the heli over. Check the TR shaft. Its possible it could be bent causing your tail vibes.
Fury 55 NIB Furion6 CGY750 fbl helicopter-Frenzy CGY750 fbl nitro-Frenzy fbl NOBAR90
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10-21-2009 01:36 AM  11 years ago
Dwight

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West Chicago, IL

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You are describing a main rotor head out of balance condition. Either the blades or flybar are out of balance or something is bent causing the head to shake. Anytime you have a tail boom shaking up and down that is a main rotor head issue.
If the tail rotor was the problem it would have a buzzing in the fins. Tail rotors spin much faster and cause buzzing in canopy or fins not up and down shake.

Dwight
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10-21-2009 01:46 AM  11 years ago
tommytt1

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Mercerville, NJ, USA

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How are the main blades tracking?I made a mistake once, but I was wrong?
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09-22-2010 04:18 PM  10 years ago
slickporsche

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American/Philippines

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If you tipped it over and damaged the blades check the main shaft with a dial indicator. Bet you have a bent mainshaft. Also check the feathering shaft. It could be in the tail, but I kinda doubt it. I hope you can find it soon,as I know the frustration you are facing.
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09-24-2010 07:36 AM  10 years ago
Optech

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San Diego, CA.

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Hahahahahaha Wow, bringing zombies back to life are we?

So.... Kevin, did you ever get that vibration figured out or are you still checking this thread daily on pins and needles waiting for a reply?

Mike
Viva La Airtronics!
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09-29-2010 02:28 AM  10 years ago
OuttaControl

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Springfield, Missouri -United states

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Caliber 4
OH BABY!!!!! That was a heck of a wait!!!! Those pins and needles are rough
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