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450 Class Electric Helicopters 450 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 05-10-2008, 12:55 AM   #1
spongebob256
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Default Trex 450 SE V2 tail binding

Hi,

I am having problem with getting the tail to work without binding.

I am using S9650 servo for the tail. It is running at 6v

I setup the tail pitch slider in the centre.
The server is 90

When i connect the servo to the gyro, put in Rate mode, set the Limit of the Gyro to the lowest, i am still getting the tail binding.

I tried moving the servo along the tail boom, still having problem

Any suggestion?
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Old 05-10-2008, 01:54 AM   #2
markleyland
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Try lowering the ball on the servo arm?
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Old 05-11-2008, 12:12 AM   #3
Skarn
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You should be setting the limit on the gyro higher, not lower to prevent binding. Bascially, you add limits to it.....

Skarn
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Old 05-11-2008, 01:11 AM   #4
ave_eme
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Quote:
Originally Posted by Skarn View Post
You should be setting the limit on the gyro higher, not lower to prevent binding. Bascially, you add limits to it.....
I actually thought the opposite. As you Decrease Limit Value you reduce the servo gain, just like End Point or ATV. So I checked the 401 Manual:

Limit Trimmer (LIMIT)
Sets the maximum travel of the rudder servo. Move the rudder stick to the
left and right and adjust the limit trimmer so that the servo operating angle
do not strike the linkage. During flight, the servo will not operate beyond
this angle and the linkage is protected. When the trimmer is turned clockwise,
the servo operating angle increases.


( Source - http://manuals.hobbico.com/fut/futm0807-manual.pdf )

And if you take a look at the Gyro - I attached a drawing from the manual - clockwise is higher value.

What I do is - I center the servo. I connect the rod with the links threaded at a normal distance (so they stay well on the link, and still can be adjusted both ways). Then I move the servo back and forth until I get a eye-balled center position at the tail pitch slider. Now I start and try endpoints from the RC - left and right. If I get a bigger value on one side (for example 70 ont he Right and 90 on the Left) I adjust the link - or, even move the servo - until I get equal End Point both ways (more or less..could be a 2-3 difference). Then I go straight to my 401 and input the same in limit. For example I have on my v2: Epa: ~80 both ways and Gyro Limit: 80.
I use Futaba RC (so I guess the values are compatible). Also! When you do end points be shure to put the gyro on Normal Mode or even put the servo directly in the receveir, else the servo will not center and you wont be able to setup a proper EPA.

I know the Limit setting is intuitive but I don't know how to test limit on the gyro. Seems to work for me though.

Mike.
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Old 05-11-2008, 11:31 PM   #5
spongebob256
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got it working

thanks for the help

Markleyland advice on "lowering the ball on the servo arm" did the trick
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Old 05-12-2008, 01:20 PM   #6
ave_eme
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Quote:
Originally Posted by spongebob256 View Post
Markleyland advice on "lowering the ball on the servo arm" did the trick
That is always the best thing to do because it lowers the force the gyro needs to turn. In my case - ~80 percent reduced travel - I would have reduced it too much by moving the ball.

Now enjoy it!

Mike.
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