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12-22-2010 12:36 AM  9 years ago
Buzzin Brian

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College Station, Texas

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Do those numbers apply to the servo horn at the shorter length, or did you start over after making it longer?

Brian
Build it, fly it, crash it. Repeat as often as needed.
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12-22-2010 12:43 AM  9 years ago
Supercoolheli

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Dallas, TX

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The tail rod was out 13mm on the arm (the big round one) since i built it. At the time, i didn't know i wasn't going by the instructions. Do you think switching the arm to the straight one will help somehow?
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12-22-2010 01:04 AM  9 years ago
MarshallB

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Middle Arkansas

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Regardless, it should be out further since the tail will perform as it should! I know that it works better further out! You may have more than one problem! This will get rid of one of them!
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12-22-2010 01:08 AM  9 years ago
Supercoolheli

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Dallas, TX

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thanks i will definately switch the arms and re-program my limits . What about the tail jittering though? Again, it does this without the arm even on it!
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12-22-2010 02:56 AM  9 years ago
Supercoolheli

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Dallas, TX

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any ideas guys? This is a DS8900G, and with the Total-G of course. I can't think of anything that would cause this behaviour? But i'm sure that this is what is causing my vibration during flight. I have verified that the step down is plugged in so that can't be it?
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12-22-2010 03:05 AM  9 years ago
MarshallB

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Middle Arkansas

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You need to verify that the reg you are using is ok. It sounds like a step down to me. What voltage are you sending to the Total-G? Where is it coming from? I would also go back through the Total-G gyro setup and make sure you have the correct servo selected! Worse case the servo may be bad.
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12-22-2010 03:09 AM  9 years ago
Supercoolheli

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Dallas, TX

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The regulator is a 5.1V step down. Not sure what you mean by "where is it coming from?". The servo was bought new and i highly highly doubt that. I'm definately not jumping to that right away, that's for sure. I just messed around with the gain and i think i might have found it. I'm not sure what normal gain levels are but like i said, i last had it at 95. I lowered it by 5 and rebooted the RX power to see if the servo was still jittering. I still felt it kicking every so often (keep in mind this is like 1 gears' worth kick-very small). I got all the way down to 75 before i felt it completely go away. Just so i don't forget, i put it at 90 so next time i get to fly i'll start there. Maybe 75 is the average gain placement and something else is wrong causing the drift? I would think that immediately if i had not heard from someone else who's problem was solved by raising the gain to 90. I also checked for the servo selection and it is in fact on the "DS8900G"
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12-22-2010 03:14 AM  9 years ago
MarshallB

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Middle Arkansas

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What is your power source and what is the input voltage was what I was getting at!
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12-22-2010 03:40 AM  9 years ago
Supercoolheli

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Dallas, TX

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Power source for the electronics is a Hyperion LiFe 2S 2100mAh unregulated for cyclics at 6.6V but the 5.1V step down is used for the tail servo.
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12-24-2010 06:42 AM  9 years ago
HeliVIG

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Hearne, TX USA

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Most step downs I know of step down a specific amount. like 0.9 volts or so. Like they assume you run 6 volts to the servos and step down 0.9volts to 5.1. You might be running a higher voltage than you think to that tail servo.

Also I agree, the tail will not work well at the shorter arm length. You need the 17mm to work well.
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12-24-2010 08:28 AM  9 years ago
Heliguychris

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Perth, West Australia

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Listen carefully when that ^ dude speaks Hia CY

Eric, i recon your step down is letting through <6V. 8900G`s are really ideally run on 4.8.

The Life pack is is doing 6.6/6.8, and the step downs are typically 0.6/ 0.9 of a volt.......try running two maybe ? If its playing up, it may be too late fro the servo anywayz.

Head rock..... here too, i needed new bearings

Shaft collar.... same here. tiny dap of 680 on the mast@ the collar.

Cheers mate.
Licensed (CASA) UAV operator certificate holder 1-YFOF5-01 www.helicamaerial.com.au
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12-24-2010 03:08 PM  9 years ago
Supercoolheli

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Dallas, TX

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yea i'll probably just get some new bearings as well. The step down itself says 5.1V on it so i assumed that it was stepping down to that voltage. THX1138 is the one who reccomended it to me and he uses the smae one on his Rave and he said it works fine . I really wouldn't think it's too late for the servo, sine i only have about 7 hover test flights on the heli. Havn't even worked the tail servo at all. Do you really think running 2 step downs will help? I would try it but like i said, i heard from someone who is having no probmes with this step down . If i indeed do need a bigger step down, is there one that will drop me lower, instead of running 2 small ones?
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12-24-2010 03:14 PM  9 years ago
puma1824

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Maryland, USA

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What type / brand step down are you using? If just using the Diode type the tail is not being stepped down enough. That type are nothing more than a diode in series. The diode used drops ~0.7v so it will only take down a ~6.6v supply to ~5.9v and this will be too much for a tail servo.

You'll need this type of step-down: LINK 1 / LINK 2 I believe Spektrum makes another type as well.
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12-24-2010 03:16 PM  9 years ago
Supercoolheli

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Dallas, TX

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yes it is the diode. Again, THX1138 was using this one with no problems but what one would you reccomened? If possible i'd rather run ONE that will drop me down furthur than to run 2 of these small ones...i just read on a different forum that running 2 diodes is not good anyway. Could you give me a link to a good one? I'd like one for only my tail. I have no problem running the 6.6V RX pack to my servos
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12-24-2010 03:17 PM  9 years ago
puma1824

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Maryland, USA

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You'll need this type of step-down: LINK 1 / LINK 2 I believe Spektrum makes another type as well.
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12-24-2010 03:18 PM  9 years ago
Supercoolheli

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Dallas, TX

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those look alright but what about this one?

http://www.helidirect.com/western-r...-led-p-7534.hdx

more affordable and it also says that it goes straight from 6V to 4.8 which is what Chris said i should be looking for right?
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12-24-2010 03:33 PM  9 years ago
Supercoolheli

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Dallas, TX

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Hmm i just read a little more about the Western Robotics one and it says that it regulates to 5.1-5.2V but in a customer review it says that it regulates the servo to 4.8V. Why wouldn't my step down (also rated to reduce to 5.2V) be fine for 4.8V rated servos as well?
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12-24-2010 03:36 PM  9 years ago
puma1824

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Maryland, USA

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That one won't work, that's stepping down 6v not 6.6v.

That type drops ~0.7v so it will only take down a ~6.6v supply to ~5.9v and this will be too much for a tail servo.
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12-24-2010 03:37 PM  9 years ago
Supercoolheli

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Dallas, TX

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ok well out of those 2 that you reccomeneded, what's the diference? I don't wanna be cheap but if the $14 one is just as good i'll go a head and order it . I also guess i could probably get the other one, although more expensive. I definately don't want to take the easy way out on something that could hurt my servo
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12-24-2010 03:40 PM  9 years ago
puma1824

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Maryland, USA

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The others I have listed take input voltage range from ~6.2 <> ~11.2v and steps down to the proper voltage.

The two listed are the same. Wire lead position is the only real difference.
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