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HomeAircraftHelicopterThunder TigerRAPTOR 50 › Tail wag/hunt???
01-12-2009 03:10 PM  9 years agoPost 1
bboyy

rrApprentice

Sydney- Australia

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Hi everyone, Ive got a problem with my 50 titan the tail will have a hunt in it foward flight but also a wag form left to right in a hover, its a slight wag that is there in, N 1650RPM 71% gain, ST1 1800RPM 62% gain and ST2 2000RPM 62% gain. I tried increasing and decreasing the gain but that didnt help. I tried moving the ball one hole in on the servo horn, still wagging even after playing with the gains again. I have checked for binding in the tail but its all moving freely. Ive changed the belt, gyro tape, tail blades bearings all round but its still there. Revo mixing is swithched off. When I throw some tic-tocs the tail wags during them especially when going + to - pitch. I have run out of ideas, could you please help me on this one

EQUIPMENT
Gyro- Ace TG7000/ DS0606 servo running 6V (60 flights old)
Blades- 620mm sab red devils and 87mm matching tail blades
Motor- Redline 53
CSM Revlock 30 (low gain setting)

Cheers bboyy

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01-12-2009 04:21 PM  9 years agoPost 2
concho

rrApprentice

montreal canada

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way is your nitro percent bboyy

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01-12-2009 04:39 PM  9 years agoPost 3
bboyy

rrApprentice

Sydney- Australia

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did you ,mean what nitri%? if so Im running 20% nitro 22% full synthectic oil. If that helps. Thanks.

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01-12-2009 07:06 PM  9 years agoPost 4
concho

rrApprentice

montreal canada

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maby you have predetonation put an additional 8 thousand head shim
a Buddy of mine had the same problem with is t rex 600
and after he put an additional head shim the wag was gone

its also a good thing that you balanced the tail rotor unit.

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01-13-2009 02:09 AM  9 years agoPost 5
bboyy

rrApprentice

Sydney- Australia

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Ive actually got a head shim but the smaller one. I think its the 4 thousand. Should i leave that one and install the 8 thousand aswell? or just put the 8 thousand? will that smoothen out the motor? and would i loose any power due to less compresion? im running OS8 plugs if that help.

Cheers.

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01-13-2009 03:31 AM  9 years agoPost 6
jschenck

rrProfessor

La Vista, NE.

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I have the same gyro/servo combo on a Raptor. I've found it's very sensitive to gain adjustment. Does it tail wag in all three flight modes? The tail wag should be more pronounced as the head speed goes up.

A few things to consider:

1 - Have you tried running without the CSM RL enabled? Just on throttle curves?
2 - As already mentioned, have you balanced the tail blades?
3 - Have you checked the runout on the clutch?
4 - I used some Zeal tape on my TG7000 to mount it. I have not tried any other mounting options. Have you considered two mounting pads or some other thicker mounting options for the gyro? I'm not 100% confident that the Zeal is the best for this gyro but if it's sensitive to vibrations the Zeal may help.
5 - Have you turned the gain down to the point where the wag stops? What setting was that?

What radio are you using?

btw - what do you think of those red devils? They sure are nice looking blades, at least in the ads.

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01-13-2009 06:34 AM  9 years agoPost 7
bboyy

rrApprentice

Sydney- Australia

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Ive tried double mounting tape under the gyro, I havent tried zeal tape because i cant find any in sydney. Ive realised the TG7000 is very sensitive to gain and vibrations. Havent tried disconnecting the revlock 30, but it done this before i installed it. Havent tried balancing the whole assembally tail yet. Whats the best way to do this? Ive also checked the run out on the clutch which all seemed fine.
The Red devils are great blades by the way, great for 3D nice response on cycles nice for autos to. They also give a stable flight and also gives that blade slapping noise when throwing them around which i LOVE. Also im using a DSX9 radio if this helps.

Cheers.

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01-13-2009 12:46 PM  9 years agoPost 8
jschenck

rrProfessor

La Vista, NE.

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I just balance the tail blades, not the whole assembly. Bolt the two blades together then add tape to the light one until they balance. I use the Align blade balancer, cheap and effective.

http://grandrc.com/inc/sdetail/21570

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01-14-2009 02:18 PM  9 years agoPost 9
bboyy

rrApprentice

Sydney- Australia

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Today i dial the fan and guess what it was out of wack, so i pulled it off and dialed the crank and that was .005 off. Took out the front bearing and it was notchy and the crank could slightly move side to side. Im hoping this could be the problem as i will be getting new front and rear bearing to replace them. Im hoping with the new bearings the motor will run with less vibrations.

Has anybody else had this problem?

Cheers bboyy

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