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Home✈️Aircraft🚁HelicopterThunder TigerRAPTOR 90 › wobble after high load manouevres.
02-26-2010 03:50 AM  10 years ago
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cd5

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penrith,Australia

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wobble after high load manouevres.
My r90 3d gets a bit of a wobble in it imediaetly after i pul a hard load manouvre. Ie when you snake and go from the upright backwards to inverted backwards etc it tends to shimmy breifly a bit like im trying to get it to crack. my hs is 1900 and im running 3d dampening.It seems like the dampeners are to hard but all the shims have been removed. Any ideas???
TThanks
Simon
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02-26-2010 04:21 AM  10 years ago
REDNOSERAPTOR

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NEW YORK

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Hi

Sounds to me like dampners check them well, also make sure everything is nice and tight on the head (flybar) no play up and down on the main shaft.

Saul.
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02-26-2010 04:28 AM  10 years ago
Rob Faust

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Spring, Tx

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Wobble
Make sure you've checked that all screws in the head are tight. I noticed a little wobble in my 90-3D the same way you did in yours. When I brought it back to the bench, I discovered that several of the screws on the head were a bit loose. Tightened them all up, and the heli flies rock solid again. Check yours.

Rob.
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02-26-2010 05:21 AM  10 years ago
Divot

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Mesa, AZ

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Ie when you snake and go from the upright backwards to inverted backwards etc it tends to shimmy breifly a bit like im trying to get it to crack
This really is not a high load maneuver. I say that because its most likely a quick change with some speed. I would be looking for tail blades being to loose or a slight reduction in gyro gain.
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02-26-2010 07:50 AM  10 years ago
cd5

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penrith,Australia

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Ive checked all the screws in the head and they are all tight. The wobble shows in the skids like a super fast aileron input so i wouldnt think its in the tail but will try thr gain. It is getting better the more i remove dampening shims. This is why im looking here to be the culprit. Ive just ran out of shims to remove. Maybe the dampeners i used may be swollen or didnt quite bed in. Ill ditch them and see how new ones go.When i say snaking , i dont mean the long flowing smooth ones, no dramas here, but the shourt hard sharp snakes that you might do in almost in the same spot. more like half piroflips getting some serious blade noise happening. Thanks for the advice so far.
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02-26-2010 10:32 AM  10 years ago
blakka_1

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London/Enfield

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How long have you been running the dampers?

Did you grease the dampers before installation?
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02-26-2010 10:36 PM  10 years ago
PhnX

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Istanbul - Turkiye

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Hi cd5,

You are completely right about the "head wobble" that raptors have. For some reason all raptors with hard dampening tend to have this wobble. I remember here somewhere S. Bell talking about how he saw other brand helis also wobble and in an experienced pilot's hand no raptor would show signs of wobble.

It seems that putting a kasama head solves head wobble. I am not an expert on this but as long as I understand head wobble relates to feathering shaft diameters and blade holder distance. Running a shorter feathering shaft (or maybe longer I'm not sure) on a kasama head actually carries head wobble to another HS range that we do not run.

So, head wobble exists for all helis but raptors (for some reason) tend to have them on 1900ish HS which we use these machines nowadays.

So , how can you get rid of it ? I also ask the same question myself (without spending $ on kasama or other brand head). My raptor 90 is fairly new on its 20 ish flight and the dampeners does not need any shims yet.

I just practice my manuveurs to not to show the signs of head wobble. I hope somebody experienced would chime in here. Colin? .
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02-27-2010 07:42 AM  10 years ago
cd5

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penrith,Australia

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Thanx pbnx. I cant justify the $ for a kasama head when i can convert to fbl for almost the same $. My fbl rappy does not have this problem. Hopefully Colin or one of the factory pilots can chime in if this is a known characteuristic on how to address this,My head and most of the heli is quick uk and i love the looks of the mechanics and bling on this heli.So i would really like to perservere and get this right without throwing a v-bar at the issue.
Thanks
Simon
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