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HelicopterRadio - Servo - Gyro - Gov - Batt › A123/LiFePO4 powering Reactor?
01-02-2010 02:23 AM  7 years agoPost 1
Kristian M

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Norway

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I wonder if i can use theese types of batteries to power my Scott Gray Reactors? If not as 2s, maybe as a 3s configuration? I don't like the idea of having Li-ion/li-po cells inside my Staysee fuselages...

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01-02-2010 02:35 AM  7 years agoPost 2
PC12DRVR

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USA

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There should be no reason why you cannot, those packs fall within the reactors operating range. Li Ion cells are pretty stable I would not worry about them, but LiPo would concern me too.

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01-02-2010 11:25 PM  7 years agoPost 3
Kristian M

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Norway

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6,6V

Are you shure they are in the Reactors operating range? Scott Grays Reactor X2 site says it handles 7,2-8,4V... As far as i know the A123 cells puts out 6,6V... I just want to be shure before i order batteries.

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01-03-2010 12:59 AM  7 years agoPost 4
rexxigpilot

rrProfessor

Florida

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Yes, it will work just fine. The only thing to remember is that if you select 6.8V (or 8.4V for Reactor X2) for the CCPM Bus it will only deliver whatever voltage the batteries are providing - approx. 6.8 to 6.4V in the case of the 2S A123 pack under load.

The Reactor will only limit the voltage to whatever you set it to on the CCPM Bus. If the battery voltage is lower, it simply passes this voltage through unregulated.

My question is why do you want to use the Reactor with A123's? I run them straight without a regulator and add a diode step down for the rudder servo. Can your servos not handle 6.8 volts?

The A123's don't hold their fully charged voltage of 3.6V per cell very long after the charge. They really have an operating range of between 3.4 and 3.2V per cell. Once you turn on the heli's equipment, the A123's will be at about 6.8V on a full 2S pack.

Hope this helps.

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01-03-2010 01:24 AM  7 years agoPost 5
Kristian M

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Norway

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Thanks for the replies!

I dont know what my servos can handle. I use Futaba 9255 on cyclic and 9202 on throttle and a Futaba governor. I posted a thread about the subject, and didn't get any viser... I dont know what to belive.

https://rc.runryder.com/helicopter/t543686p1/

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01-03-2010 04:13 AM  7 years agoPost 6
rexxigpilot

rrProfessor

Florida

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The 9255 is the higher torque version of the 9252 standard digital servo. No doubt they are very similar with slightly different gear ratios.

I read the responses on your linked post. As Tank Dirt indicated, many are using the 9252's above 4.8V. But it is typically done on a regulated 2S (typically 5.7-5.8V), which is close to the voltage of a fully charged 4 cell NiCd/NiMh pack. I have done so myself without any problems.

I don't know of anyone using 9252's with a 6 cell NiXX (approx. 6.8V at full charge). This is about the same as a 2S A123 pack.

I run 4 helis on straight A123's. However, I'm using all BLS servos for cyclic. They are 6.0V nominal rated.

You probably should heed Ben Minor's advice and not push the voltage too high with your 9255's. They may be OK on a straight A123 pack, but since no one can say they tried it and you have the Reactor, use it. The 6.0V setting on your Reactor should be fine since it is regulated and far lower voltage than a fully charged 6 cell NiXX pack.

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