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    • All Forums >> RC Helicopters >> Electric RC Helis >> T-Rex heli >> 450 tail wag
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    450 tail wag - 11/7/2012 3:46 AM   
    cantw8tofly


     

    Posts: 136
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    From: slidell, LA, USA
    Status: offline     		I just built a trex 450 and it has a wicked tail wag during flight. It seems to get worse the higher the head speed. I can get most of it out by lowering my throttle curve and turning the gain way down in my transmitter.


    This is only the 3rd heli i have set up and never had this problem before.



    Does anyone have any suggestions?

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    RE: 450 tail wag - 11/7/2012 8:11 AM   
    Kozzy_98


     

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    From: SydneyNew South Wales, AUSTRALIA
    Status: offline     		Whats the distance between the ball link on the tail servo from the center of the servo horn?

    Sometimes it can be too long and yo may have to reduce the amount. Most go for 8-10mm.

    Also, whats the tail servo and gyro that you have on the helicopter?



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    Helis: HK450GT - Typhoon 2215+Spektrum AR6200X, HK450G/MT - Typhoon 2218+Orange6chRX, MCPX


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    RE: 450 tail wag - 11/7/2012 12:39 PM   
    john josey


     

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    quote:

    ORIGINAL: Kozzy_98

    Whats the distance between the ball link on the tail servo from the center of the servo horn?

    Sometimes it can be too long and yo may have to reduce the amount. Most go for 8-10mm.

    Also, whats the tail servo and gyro that you have on the helicopter?



    Yeah, i agree.

    If you find a hole on the servo arm that lets you run the gyro gain around 70-75% at the headspead you want to run. This of coarse assumes there is nothing wrong with the servo or gyro.


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    RE: 450 tail wag - 11/7/2012 10:31 PM   
    cantw8tofly


     

    Posts: 136
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    From: slidell, LA, USA
    Status: offline     		The gyro is an align gp750 and the servo is an anign ds520.


    I have the ball in the closest hole on the servo arm.


    I am using a futaba t7c transmittier and i am not sure if i have the gain set right in the radio.

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    RE: 450 tail wag - 11/7/2012 10:42 PM   
    john josey


     

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    quote:

    ORIGINAL: cantw8tofly

    The gyro is an align gp750 and the servo is an anign ds520.


    I have the ball in the closest hole on the servo arm.


    I am using a futaba t7c transmittier and i am not sure if i have the gain set right in the radio.


    If you were to turn the gyro gain down to nothing with the transmitter would it give you a value of 0 or 50 ?


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    RE: 450 tail wag - 11/8/2012 4:23 AM   
    cantw8tofly


     

    Posts: 136
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    Status: offline     		zero i do believe

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    RE: 450 tail wag - 11/8/2012 1:09 PM   
    john josey


     

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    quote:

    ORIGINAL: cantw8tofly

    zero i do believe


    Ah, ok.

    What value is the gain on the TX when the tail wags and what value do you have to turn it down to, to stop the wag ?


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    RE: 450 tail wag - 1/28/2013 3:08 AM   
    69 roadrunner


     

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    From: mt shasta, CA, USA
    Status: offline     		Iam new to heli I can hoover move left and right forward and back. I crashed and didn't fly them for about two yrs just flew fixed wing. We just lost out field and am tring helis again so I can fly at home but now the tail wags back and fourth abot three inches. Iam using a 401 gyro and futaba s9650 digital any help would be great

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    RE: 450 tail wag - 1/28/2013 11:43 AM   
    john josey


     

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    quote:

    ORIGINAL: 69 roadrunner

    Iam new to heli I can hoover move left and right forward and back. I crashed and didn't fly them for about two yrs just flew fixed wing. We just lost out field and am tring helis again so I can fly at home but now the tail wags back and fourth abot three inches. Iam using a 401 gyro and futaba s9650 digital any help would be great



    If this is a helicopter that was running ok before a long lay-up, the first thing i would do is check the entire T/R assembly for super smooth movement with no tight spots.

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