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HelicopterAlignOther › GY611 with 6 volts (Align 2 in 1 - BT6)
12-01-2007 09:47 PM  10 years agoPost 1
benlevy3

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Houston, TX - USA

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Is anyone running a GY611 with 6 volts? The specs in the manual say that the operating voltage range is 3.8 to 6 volts. It does not say anything about the operating voltage of the S9256 server though. I planning on using this with the Align 2 in 1 (HE50H11 -- B6T 2 In 1 Voltage Regulator with 1900mA LiPo)

Thanks,
Ben

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12-01-2007 10:04 PM  10 years agoPost 2
cookie monster

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Los Angeles

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I have the same set up and it works sweet. No problims so far

Miniature Aircraft fury extreme 90 710 radix Y.S 91

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12-01-2007 11:07 PM  10 years agoPost 3
TankDirt

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Illinois

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make sure you use a step-down regulator for the tail servo...you MUST use one.

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12-01-2007 11:19 PM  10 years agoPost 4
mont_blanc

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UK

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You don't need the step down. I've been running the 611's servo off the align 2 in 1 (5.8v) and no problems. Even had it confirmed ok by Futaba support.

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12-01-2007 11:38 PM  10 years agoPost 5
TankDirt

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Illinois

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the align step down is 3 bucks,I would HIGHLY recommend it.

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12-02-2007 12:13 AM  10 years agoPost 6
MJHiscott92504

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James Hiscott , Germany for past 11 months

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Step..

Step the voltage down, there is no benefit to running 6v through your tail servo. The 9256 is already a fast servo and the tail on the 600N is extremely fast already.

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12-22-2007 07:42 AM  9 years agoPost 7
MolokaiBoy

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Lahaina, Maui,Hawaii USA

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I too use a step down to my servo

Les
Maui RC Modeler's, Big Island RC Helis, http://www.facebook.com/mauirc

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12-22-2007 11:19 AM  9 years agoPost 8
heli-hurley

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st.neots

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I brought the servo separately and on the box it states 4.8v only

My heli works as an ornament.......at least it stays in one piece!!!

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12-22-2007 02:25 PM  9 years agoPost 9
JRjoe

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Jonesville , IN USA #1

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Use the step down or get an Arizona Reg.....


JRjoe.....
Indoor plumbing??? No, we don't need that!!!

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12-22-2007 04:13 PM  9 years agoPost 10
Eury

rrProfessor

Dover NH

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As if you needed to hear it again, use the step down. I've got the stepdown on both of mine. Why operate it above specs and risk burning out a $100+ servo when there's no performance reason for it, and you only need a $3 part to set it up right?

Nick Crego

Citizen #0168

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12-22-2007 04:21 PM  9 years agoPost 11
MolokaiBoy

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Lahaina, Maui,Hawaii USA

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I brought the servo separately and on the box it states 4.8v only
You are correct but I think a fully charged 4.8v nicd pack is well over 5.0+ when fully charged so I would assume using the 2 in 1 and step down to 5.1 v to the tail servo should do just fine

Les
Maui RC Modeler's, Big Island RC Helis, http://www.facebook.com/mauirc

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12-22-2007 05:46 PM  9 years agoPost 12
BarracudaHockey

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Jacksonville FL

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4 cell packs charge to 5.3v

You really want to use a step down.

Andy
AMA 77227
http://www.jaxrc.com

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12-22-2007 06:58 PM  9 years agoPost 13
rexxigpilot

rrProfessor

Florida

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Ben,

COOKIE MONSTER and MONT_BLANC (he got an OK from Futaba) already gave you your answer. A fully charged 4 cell NiCd or NiMh is approximately 5.8 volts. A 4 cell has a nominal voltage of 4.8 volts, but it starts out at almost the exact same voltage as the Align regulator's output. Anyone wonder why Align would set their regulator output at 5.8 volts?????

Also, the GY611 manual does specify an operating range of 3.8 - 6.0 volts. While I haven't seen the electrical schematics for the GY611, the AMPLIFYER part of the gyro may do more than boost the rudder signal. It would make sense for Futaba to have included voltage regulation/limiting of the power leads as well. But, maybe not. Has anyone checked the output voltage from the gyro amp when using a 5.8 volt input?

The voltage specs the S9256 servo is 4.8 volts, but this is a nominal voltage specification. As we all know, batteries lose voltage as they discharge. Futaba would not designed a servo to fail because someone fully charged their 4 cell NiCd pack completely.

Bottom line, I have flown without any problems whatsoever with the same and similar 5.8 volt setups with my GY611 for the last 9 months (note: the Align RCE-B6X and B3X also have an output voltage of 5.8). I switched over to the BLS251 tail servo a few weeks ago with no problems. It is also specified to use 4.8 volts.

I hope this has allayed you concerns. I know there will still be some, like TankDirt, who beleive it is better to pay $3 for the step down regulator just to be safe. However, this needlessly adds complexity and potential failure points (connectors and resistor) to you system. This is always a bad idea. Anyone ever heard of the KISS principle (KISS - keep it simple, stupid). But then again, doesn't the use of the Align 2 into 1 regulator violate the KISS principle?

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12-22-2007 07:37 PM  9 years agoPost 14
BarracudaHockey

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Jacksonville FL

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The higher the voltage the lower the dead band. These tail servos run a very narrow dead band to begin with which is why its not a good idea to run them at that voltage.

Its your 100 dollar servo though, do as you please.

Andy
AMA 77227
http://www.jaxrc.com

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12-22-2007 09:23 PM  9 years agoPost 15
rexxigpilot

rrProfessor

Florida

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Deadband?

Yes, reduction in deadband is a good thing. That's why JR likes to claim "zero" deadband for their newest servos. Reduced deadband increases the servo's accuracy, smoothness and holding power while reducing the lag time to full power. This is particularly usefull in a tail servo where the servo spends a great amount of its time at low control signal to hold the rudder. That's why we use digital servos!

The possible problem with the higher voltage is increased heat. Beacause they operate with reduced deadband, all digital servos use more power and, therefore, generate more heat than a standard servo. The S9256 and BLS251 are both equipped with large heat dissipation measures built into their cases.

The Align regulators are a linear type regulator instead of the digital switching kind. The voltage from a linear regulator is fairly constant, 5.8 volts with the Align.

If you use a digital regulator, you definitely should use the 5.1 volt step down regulator. The applied voltage (typicallly, the same voltage as the instantaneous battery voltage) is swithed on and off to provide an average voltage over a short time interval equal to whatever the regulator specifies. This means that a digital regulator using a fully charged 2S lipo could deliver electrical pulses with an instantaneous voltage of 8.4.

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12-22-2007 10:07 PM  9 years agoPost 16
dannyh5

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England

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Align regulators are not linear. They use pulse width modulation PWM with high speed transistors ( the 4 DPAK packages ). They are switching regulators that use several components in place of a single switching regulator package. I have made regulators in this way myself. I stripped down the first 2 in 1 I got after replacing it with the version 2. The PWM is a PIC and there are 4 high speed 3 amp transistors that make up the major part of the circuit. As a matter of fact the 2 in 1 regulator has NO regulator packages in it at all. It is all done with PWM. Which is far better, more efficient and accurate than purpose built switching or linear packages. Yes that means the 2 in 1 IS better than the Arizona regulator ( any problems that align are having are due to quality only not the circuit), it runs cooler and this is why it uses a smaller heat sink. More efficient = less waste as heat= smaller heat sink required. The Arizona regulator is a couple the $2 switching regulator packages shoved on a board and sold to people that know no better, a total rip-off. They could be knocked up by at home in a couple of hours.

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12-22-2007 10:45 PM  9 years agoPost 17
rexxigpilot

rrProfessor

Florida

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4 cell pack voltage

Barracuda,

If you get only 5.3 volts from a fully charged 4 cell NiMh pack, you need a new pack. Granted, a NiCd pack is approx. 5.3-5.4V fully charged, but not many use NiCd anymore for receiver packs. The peak charge per cell for NiMh is 1.47V, give or take a hundreth of a volt. This produces a 4 cell NiMh pack with 5.88 volts. If you don't believe me, please go to pages 15 and 16 of the following reference. http://www.hardingenergy.com/pdfs/NiMH.pdf

How many people do you think ignore the the Futaba warning placed in the instructions and on the box for many of their servos stating, "Use Ni-Cd Only?" How many pilots using 4 cell NiMh packs have had a problem due to too high a voltage? Not many that I am aware of.

Like I said, I have been using the GY611/S9256 & BLS251 with an Align 2 in 1 (HE50H11 - B6T) without ANY problem. That is the answer to Ben's original question.

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12-22-2007 10:58 PM  9 years agoPost 18
rexxigpilot

rrProfessor

Florida

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Thanks for the correction on the Align 2 into 1 DannyH5. The use of a heat sink at all with a PWM device threw me off. I was referring to a single/simple switching device needing a regulator. The Align doesn't need it.

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12-22-2007 11:20 PM  9 years agoPost 19
benlevy3

rrNovice

Houston, TX - USA

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Thanks for all your input. I should have posted sooner. I called Futaba and the guy said that I should run the step down. Although, he really did not seem to know what he was talking about. Anyway, I used the Align stepdown and everything is working great. The gyro/servo combo is unbelievable. The servo is so smooth and it stops on a dime. I am flying HiTech servos (other 4), but I think next time, I am going to upgrade to the Futaba brushless servos.

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12-22-2007 11:55 PM  9 years agoPost 20
BarracudaHockey

rrMaster

Jacksonville FL

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I saw the brushless Futaba's in action today and they are nutz.

Andy
AMA 77227
http://www.jaxrc.com

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HelicopterAlignOther › GY611 with 6 volts (Align 2 in 1 - BT6)
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