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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › Setup thoughts 4.8v to 6v
01-02-2013 02:35 AM  7 years ago
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mustang67ford

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Central Pennsylvania

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Setup thoughts 4.8v to 6v
I have 3 helis I am thinking of converting from 4.8v to 6v. Need to update the batteries, so why not go with a little more buffer for voltage drop. The 2 batteries I am considering are a hobbico hydrimax 6V, AA-cell, 2000mAh (cat #LXNHS4 on tower hobbies), or a hobbico hydrimax 6V, C-cell, 4200mAh (cat #LXMTX4 on tower hobbies). My 3 heli setups are as follows with all futaba gear:

Heli 1: R617FS receiver, GY520 gyro, S3151 rudder servo, S3010 all other servos.

Heli 2: R617FS receiver, GY520 gyro, S3050 all servos including rudder.
 
Heli 3:  R617FS receiver, GY401 gyro, S3010 rudder servo, S3152 all other servos.

What I don't know, is the gear says 4.8-6v, but an actual 6v battery puts out more than 6v. Also the s3151 servo does not list data for 6v so not sure if it will work at 6v.

Can anymore experienced with 6v setups offer some input?
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01-02-2013 02:28 PM  7 years ago
Four Stroker

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Atlanta

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The Futaba equipment that you listed does not need an additional voltage buffer. If you are really after more umph, use a voltage regulator set to maybe 5.7~6.0 volts and a 2S LiPo or LiFe.
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01-02-2013 05:17 PM  7 years ago
mustang67ford

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Central Pennsylvania

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What I am thinking is as the 6V can drop much more that the 4.8V can as the battery drains. 6V drain will put it into the 4.8V range. 4.8V drain could cause a crash. A little safety factor with 6V lets say.

I want to go with a permenant pack and not LiPo or LiFe.
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01-02-2013 06:20 PM  7 years ago
Four Stroker

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Atlanta

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I think you have a misconception here. Futaba stuff is good down to 3.2 volts. The old Spektrum stuff would dump at 3.8 volts.
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01-02-2013 09:41 PM  7 years ago
mustang67ford

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Central Pennsylvania

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I was going by the equipment specs. For the receiver as an example it says Power requirements: 4.8v-6v. So I thought it would be better to start running at 6v since I need to upgrade some batteries anyways.Team HeliProz - Retired
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01-26-2013 04:18 PM  7 years ago
Zaneman007

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Texas - USA

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Speaking for myself?
Most of us with 6V experience are using a regulator to drop a 7.2 volt lipo to a constant 6 volts, and some are using LiFe's witch drop to 6.6volts unregulated when loaded.

I agree that you need a little bit of a safety margin when running a 2.4Ghz system on 4.8V. It is not something that I would do. A power surge/spike on a 4.8V system would cause almost any 2.Ghz system to power off.
What I don't know, is the gear says 4.8-6v, but an actual 6v battery puts out more than 6v. Also the s3151 servo does not list data for 6v so not sure if it will work at 6v.
As you know a nicad rated at 4.8v, puts out more than 4.8 volts. With that said, I would think that a 6V servo on a 6V battery would be just fine.

If there is no information on the servo above 4.8V, then that would indicate that it is not rated for anything higher than a 4.8V battery. I personally burned out a 4.8V tail servo in short order, when I hooked it up to a constant 6V regulator.

You might consider looking into adding a capacitor to your layout, just in case. Spectrum sells them or you can make your own.

I hoped that helped.
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01-26-2013 05:57 PM  7 years ago
aadams1278

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Wilson, NC - USA

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I'm in almost the same position as the OP. I just upgraded my batteries to LiFE at 6.6v and all my equipment is good for 6v except my futaba 9254 tail servo. I currently have 2 in line drop down regulators i'm planning on running to the tail servo. They drop the voltage down to 5.47v when the helicopter is sitting still and less when I rotate the sticks.

Does anybody know how much voltage a 9254 can actually handle before it starts to damage it? Obviously it's higher than exactly 4.8v, but is 5.47 too high?
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01-26-2013 07:17 PM  7 years ago
mustang67ford

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Central Pennsylvania

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I read thru futaba's question/answers online. One thing it stated, was running their equipment at 6v would reduce the life of the equipment. I therefore decided to stay with 4.8v.Team HeliProz - Retired
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01-26-2013 07:52 PM  7 years ago
DougV

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Miramar, Florida - USA (Ft. Lauderdale)

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To the OP,
If you are getting new packs, Go with A123 pack, no regulator that's all you need with your setup.
9254 is a 4.8v servo.

Doug.
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01-27-2013 02:57 PM  7 years ago
Dr.Ben

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Richmond, VA, USA

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Though my personal preference would be around 5.2v, there is minimal likelihood that 5.5 v regulated or stepped down will cause harm to a 9254. The quickest way to harm that servo in the specified voltage range is to run excessive gyro gain in a model which is not operating smoothly. Futaba has an inline voltage reg that is specifically designed for applications such as yours to place voltage to the servo in the safe range.

Side note: Due the nonlinear relationship between power consumption and voltage increases, a few tenths of a volt does matter. Back last year when we were examining the problem of overvolting and thus overheating servos with the CGY 750, pushing right to 6 volts or worse running a Life pack with 4.8v NOMINAL servos was when problems really showed up. Keep at or comfortably below the typical peak voltage of a 4.8v NiCd with servos rated for less than 6 v, and things typically play well.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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01-30-2013 03:45 AM  7 years ago
dkshema

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Cedar Rapids, IA

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The S9254 is good to +5.8VDC.-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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01-30-2013 01:58 PM  7 years ago
aadams1278

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Wilson, NC - USA

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thanks for the reply dkshema
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01-30-2013 08:06 PM  7 years ago
czorzella

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Brazil, São Paulo, Sao Paulo

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I'm using a WR Tail Servo Step-Down Voltage [WRL-STVRL] on my T-REX 500 to drop voltage for the S9257 tail servo from 6V to 5.4V, but not to the maximum 5.2V as Futaba recommends.

Futaba replied to my inquire as follows: "You can set your ESC to 5v and the S9257 will operate just fine. You would not want to go over 5.2v or lower than 4.8v."

Reading Futaba's reply, I'm really concerned that I might be pushing the tail servo beyond its voltage limits. What should I do?
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01-31-2013 02:33 PM  7 years ago
doorman

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Sherwood, Arkansas

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Batteries????
Keeping it simple, I would suggest that you use a 6volt pack and put a inline step down for the tail servo.. align makes one for a couple of bucks...
OR use a 6 volt pack and run it through a voltage regulator prior to supplying power to the rx... adjust it to 5.2 to 5.8. (I like the 5.8 and the the step down on the tail servo!!)
The packs that I like to use are NICAD sub C 2400 packs from NO BS Battery.. used these for years without incident and still use them... nicads are OLD SCHOOL and so am I but they do work!!!! I do not like nickel metal because of the straight line discharge and then a sudden fall off... I have used 3 in the past and lost or almost lost all 3 machines.. no more problems with the sub c set up...
This is how I do it and think it answers your OP..

Good Luck, Stan
AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft
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02-05-2013 05:00 AM  7 years ago
Dr.Ben

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Richmond, VA, USA

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By virtue of circuit design and inherent efficiency issues, many regulators require at least a 6cell NiCd/NiMH to regulate down to desired supply voltage. Western Robotics makes among the best BEC/regs in the business. Their stuff on average wants the input voltage to be several volts minimum above desired output voltage.

Remember NiCd's are effectively out of production, so watch date codes carefully when you are buying what you think is "new".

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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