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HomeAircraftHelicopterMain Discussion › why does the tail swing to the right when i add throttle?
12-09-2004 09:46 PM  13 years agoPost 1
Chopper1

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San Francisco Ca

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i just bought this used heli and some how when ever i add throttle and pitch. the tail swings to the right even when its on heading hold. please help.... thanks

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12-09-2004 09:47 PM  13 years agoPost 2
Jared J

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Harrisonburg, VA

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Torque

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12-09-2004 10:02 PM  13 years agoPost 3
SLiebl

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Lancaster, PA - USA

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More information. Heli, radio, gyro, etc.

You might have Revolution (REVO) mixing enabled in your radio. Turn it off if using a heading hold gyro.

-Steve

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12-09-2004 10:03 PM  13 years agoPost 4
shuttlepilot

rrElite Veteran

Mullins, South Carolina

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You need to set up the tail mechanically so that when you are in hover that you don't have to do much with the tail. Do this with the gyro in rate mode. You may have run out of throw on the tail servo. Torque will take the nose left on liftoff, or application of power. Mechanically set the tail blades to have a little pitch toward tail boom (if tail rotor is on right side) so that it will be pulling the nose to right a little. Throttle up and see which way the nose wants to pull. When the heli is light on it's skids, you should only have to make small corrections with the rudder stick to keep everything lined up. The ideal situation would be being able to hover with little correction using the rudder stick. Then you can switch back to heading hold. Also, make sure that the gyro is correcting in the right direction, it could be reversed.

Gas is Great
Camper Fuel is Better!!
QWW Helis

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12-09-2004 10:26 PM  13 years agoPost 5
merlin3

rrKey Veteran

dayton, ohio

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I just found that I have the exact same problem. I am still practicing hovering. When I try to climb real quick out of a hover the tail trys to swing to the right. Any ideas?

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12-09-2004 10:44 PM  13 years agoPost 6
A. Bundy

rrElite Veteran

Aurora,IL. 30W/SW of Chicago

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More rudder travel/more gyro sensitivity/bigger tail blades/make sure revo mix is off.A good gyro will still kick a little(several inches at the tail)when you really punch it hard.A 601 with a powerfull tail is what you need for a dead solid tail.A gy401 and most gyros will hold pretty good.

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12-10-2004 08:21 AM  13 years agoPost 7
Chopper1

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San Francisco Ca

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found the problem
i was advised to put more gain in the gyro or add more power to the throttle curve, and i play with it a little and it did solve the problem. it doesn't swing anymore.

but now, its seem like its over speeding. i'll try to replace the tail blades with a longer and bigger blades,

thanks RussD

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12-10-2004 01:18 PM  13 years agoPost 8
prebres

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Knoxville, Ohio

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On a 30 size bird you could go all the way up to 85mm tail blades

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12-10-2004 02:11 PM  13 years agoPost 9
Ringding

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Austria

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Does it go back to where it was before when you take back pitch? If it does, you are in heading hold and either the servo throw is too little or the tail blades are too short.

If it doesn't, either you are not in heading hold or you have revo mixing turned on.

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12-10-2004 02:41 PM  13 years agoPost 10
KMorgan

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Bonnie Scotland

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I think SLiebl probably has the answer. Make a thorough check that you do not have revo-mixing enabled.

On a 9C for example, revo-mixing is enabled by default. This is the only mix that is not inhibited as the starting point, so it is easy to miss it. Now why would I know that

K

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12-10-2004 07:23 PM  13 years agoPost 11
Chopper1

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San Francisco Ca

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9c revo off
i have the 9c and the revo mixing is off. i'll try to change the tail blades to longer blades.

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12-10-2004 07:58 PM  13 years agoPost 12
AirWolfRC

rrProfessor

42½ N, 83½ W

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Chopper1, Can't answer anything unless you tell us what gyro you're using and how it's currently set up.

Wolfgang

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12-10-2004 08:09 PM  13 years agoPost 13
helicrap

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Atlantic City , NJ.

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You really should supply all info. so folks can give you accurate info.

What Heli ?
What Gyro and tail servo ?
Radio - we know is a 9c.

Some people do not know there are multiple revo settings. Also flight modes for mixing. Check radio again.

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12-10-2004 09:44 PM  13 years agoPost 14
SLiebl

rrApprentice

Lancaster, PA - USA

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I can't imagine changing the tail blades will help this problem. More than likely, it's radio or gyro setup.
If you haven't trimmed the heli out in normal gyro mode, that could be your problem too.
Start out in normal gyro mode, and lift off the ground. If the nose moves left (tail right) you need to lengthen or shorten the pushrod to counteract this. Then lift off again, repeat.
Once you've got the heli trimmed out so the tail is pretty stable in normal mode, then switch to heading hold.
If you went right to heading hold without doing this, your gyro may be holding in almost all of your left "rudder" to prevent rotation to the right. Then when you try to climb out, there's no more throw to give the tail and the heli yaws.
How's that sound guys?

-Steve

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12-10-2004 10:45 PM  13 years agoPost 15
jerrythercpilot

rrVeteran

--South Florida --

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More RPMs on the main rotor. Too slow and the tail will move to the right.

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12-11-2004 04:01 AM  13 years agoPost 16
helicrap

rrApprentice

Atlantic City , NJ.

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Sliebl

Your summation is right on, if in fact that is his problem. Could also be a slow servo, weak gains, missmatched tailblades, revos not completely turned off, etc. We need more info from him to help.

Helicrap

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12-11-2004 11:23 PM  13 years agoPost 17
Chopper1

rrApprentice

San Francisco Ca

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sorry, more info
i am flying a raptor 60 with ys 61 st 2 motor
gryo is gy401 with the gain set at 70
tx is 9c with the avc set to 90

i found that if i add more throttle then the swings stops but the engine seems to over speed. if i add more pitch then the swings comes back.

my other raptor 60 doesn't have this problem...
thanks

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12-11-2004 11:51 PM  13 years agoPost 18
AirWolfRC

rrProfessor

42½ N, 83½ W

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The 401 is a good piece. 60% is a good gain setting for the 401. Make sure you have adequate travel on the tail blade slider and the servo arm length on the tail servo is 15mm to 20mm. Set the limit on the 401 as needed to limit full travel on the tail slider. Check the head speed, you should be 1700 to 1800 for 3D. Stock tail blades should be good enough. And, of course, adjust your throttle curve as needed to hold head speed.

Wolfgang

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12-11-2004 11:53 PM  13 years agoPost 19
helicrap

rrApprentice

Atlantic City , NJ.

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If in fact you are using 9253 / 9254 servo than raise gain in till it wags and than back up untill wag goes away. Also set up tail in normal mode as stated by someone else. I'm not sure of the correct numbers for gain in that radio as they differ from brand & setup. Servo horn should be 16 mm or better center to center. If not running Dig. high speed servo than ad delay and increse tail blade length to 105 mm or better. 401 sets up pretty easy, but you must set up basics right.

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12-12-2004 02:12 PM  13 years agoPost 20
SLiebl

rrApprentice

Lancaster, PA - USA

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If your head is overspeeding when you add more throttle, then you have a problem with either your pitch curve, or your throttle curve.
Isn't there someone at your local club that can give your heli a once over and help you with initial setup? Did you get the manual with the 401? It really is a breeze to setup, but it doesn't do it on it's own. You NEED to set the limit on the gyro itself. On the bench, throw left rudder and carefully turn the limit pot to get max throw, then do it to the right, find the best setting for both directions. Maybe you don't have enough throw in it.
Did you do as stated before and set up the tail in NORMAL?
Let us know what you've tried or we're just wasting our time making suggestions.
Are you using training gear? If you are, make sure you don't overspeed the head.

-Steve

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HomeAircraftHelicopterMain Discussion › why does the tail swing to the right when i add throttle?
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