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HelicopterThunder TigerOther › Tail servo acting weird!!
04-27-2004 06:57 AM  13 years agoPost 1
bigdaddyg

rrNovice

Albuquerque, N.M.

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Hello all,
I have decided to go with a JR DS 8417 servo for my tail (instead of the Hitec 5925MG) coupled to a JR 500T ring gyro on my Raptor 30 V1. I am running a 6 volt battery. This servo makes noise about 99.9% of the time when it is just sitting powered up. I have learned that this is normal. My problem is that with the heli on the bench just sitting still I notice some 'hunting' by the servo arm on the DS 8417. Also if I give rudder commands sometimes the servo arm will stay deflected to the left or right after I center the stick on my Tx. My first thought was the battery may be low, but it is fully charged. My tail linkage is as smooth as I could get it with no binding. I just got the 8103 Tx back from JR having CCPM activated and tested by their techs. It got a clean bill of health. I have ran the 6 volt battery on a regulated switch harness as well as unregulated. I did this because in the gyro's instruction manual spec's it is rated at 4.8 volts only. Either way I get the same results. The servo will stay deflected sometimes and does not always go back to center.
I am wondering what is the problem? Servo, Gyro, Rx, Tx, what?!! Anyone out there that can help please do!! This problem is holding up my flying. No way am I going to risk it in the air if I can't get reliable performance on the bench. As always thanks in advance for your input.

Thanks,
G

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04-27-2004 07:41 AM  13 years agoPost 2
the collective

rrKey Veteran

Bayside, NY, U.S.A

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As you noted, the constant buzz of a digital servo at rest is normal.

As for the servo not returning to center when you release the stick, this is entirely normal as well, when the gyro is in heading lock mode a stick command will deflect the srvo, but if the model doesn't yaw the servo will hold the command until the model does. That's to be expected in heading hold mode. When you switch the gyro to rate mode (also called "normal" mode) then the servo should center itself whenever you release the stick.

You'll also notice that if you have the gyro in heading hold mode that if you yaw the heli on the bench the gyro will deflect the servo and hold it there until you yaw the heli back to its origina ldirection. In rate mode, the gyro will deflect any time the model is turning, and center when the model is stationary.

Hope that helps some,

David

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04-27-2004 07:50 AM  13 years agoPost 3
Drunk Monk

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Preston, UK

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Sounds like it's in heading hold mode to me too


Stephen

I only open my mouth to change feet.....

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04-27-2004 08:15 AM  13 years agoPost 4
bigdaddyg

rrNovice

Albuquerque, N.M.

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Hello again,
O.K. this info is good to know. My problem is I have not set any of the rates yet in my Tx. I am thinking with this gyro you select heading hold mode or rate mode by how high the gain is set at in the Tx. I need to check this and see where the factory defalt is set at. I believe I saw a post in this forum saying once you get above 75% the 500T gyro moves into heading hold mode. The default setting in the Tx is probably 100%. It is good to know that nothing is wrong with my equipment as I originally thought.
Thanks again,
G

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HelicopterThunder TigerOther › Tail servo acting weird!!
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