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HomeAircraftHelicopterFlybarless Rotor Head SystemsBrain iKon › Ikon2 and futaba BLS256hv tail servo problem
08-24-2017 02:37 AM  12 months agoPost 1
flyride

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Salt Lake City UT

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I have a futaba BLS256hv servo running at 6v and I updated my ikon2 to the latest firmware and when I was resetting the tail setup in step 8 if I click the positive button over a certain point the servo goes dead but if you add opposite input from the radio stick it come back alive. If I back off the tail endpoints a few clicks it works perfectly. The tail is not binding at all it just goes dead and you can move it by hand until you give it some opposite input from the stick. It happens on both sides and I tried two different servos and on two different ikons and get the same result. Does anyone have any idea why it is going dead at the end of the travel?

If I just limit its travel on both sides it is fine and works perfect so should I just limit the travel and just fly it?
I was actually flying it when I discovered the issue.

and the blonde said "RECTUM, Hell damn near killed em!!"

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08-24-2017 03:21 AM  12 months agoPost 2
ticedoff8

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Morgan Hill, CA. USA

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Open the Wizard Menu and on page 2, change the tail servo's settings

http://www.gpdealera.com/cgi-bin/wg....pgm?I=FUTM0759

The guide says 760uS pulse width and 270mS Refresh

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08-24-2017 04:34 AM  12 months agoPost 3
flyride

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Salt Lake City UT

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I tried that but at that rate the servo just twitched and jittered.

and the blonde said "RECTUM, Hell damn near killed em!!"

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08-24-2017 04:36 AM  12 months agoPost 4
flyride

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Salt Lake City UT

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It works perfect at the 560 until it gets to the end point.

and the blonde said "RECTUM, Hell damn near killed em!!"

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08-24-2017 08:40 AM  12 months agoPost 5
rik

rrNovice

Italy

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Move the unibal of your tail servo horn out one hole (at least).

This is normal and happen to all kind of servos when you ask to your servo more than that servo can manage.
If you send to a servo a control pulse that have a duration bigger (or smaller) than that the maximum (or minimum) allowed, servo goes dead (turn off).

For a tail servo with a center pulse with a duration of 760us like your BLS256HV, the maximum allowed duration of pulses is ~760uS+350uS=1110 and the minimum allowed duration of pulses is ~760uS-350uS=410uS ("~" mean around because not all servos brand and type are the same and these are secure values).

As already explained to you, you can check the positive throw and the negative throw durations that you have selected in the wizard going in to "Advanced -> Common -> Servos and look to the uS values of Servo n°4 (tail servo).

If you don't have selected the wrong kind of servo frame rate (standard servo with a center pulse of 1520uS with allowed pulses that can change from 800uS to 2200uS), your problem is simply due to the very low mechanical gain for the control of your tail. This mean that is required a very big rotation of the servo horn to obtain a little move of tail blade incidence.

The solution as already explained at the start of this post is to move the unibal on your tail servo horn outside.

I also suggest you to read the instructions of the producer of your model where for sure you can find the suggested position of the unibal on tail servo horn for that specific mechanic.

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