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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Need advice on replacing RX packs.
05-03-2005 09:32 AM  13 years agoPost 1
Tek

rrVeteran

Yukon, OK USA

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I currently run 1800-2400 C Nicads and need replacements for the upcoming season. I am not ready to try lipos yet. I will be runnning 3XS9252s, 1XS9254, 1XGY401, and a GV-1.

-------Does it fly?-------

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05-03-2005 01:22 PM  13 years agoPost 2
mcoccia

rrKey Veteran

Central Jersey

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Hi,

I have a JR Extra 2400 Nicad Sub C pack I can sell you. Only used it twice before I went to Lipo's.


P.S. You can't go wrong with the Lipo solution.

I am running:
UBEC & TP 1900 3S
4 JR 8311 Digi Servo's
Gy401 & 9254

Easy 10 flights.

P.M. about the JR battery pack if interested I will take a Pic and send it to you.

Thanks
Mark

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05-03-2005 06:46 PM  13 years agoPost 3
Tek

rrVeteran

Yukon, OK USA

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I already have a few 2400 Nicad packs and will buy new packs. I am looking to replace them with something better like NIMH. I have never used NIMH in my helis and am not familiar with the advances or which ones are suitable. I might even go lipos if the price was not at 200.00 a set.

-------Does it fly?-------

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05-04-2005 05:12 AM  13 years agoPost 4
Tri135

rrApprentice

San Diego, CA

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I just started flying a 2400mAH Li-Ion pack from Fromeco with their regulator programmed at about 5.75 volts. As far as I can tell, I can get about an hour and a half of flight time (nine flights) with a good reserve. I am flying a Raptor-50, 3-JR 8231's, Futaba 401 w/9253, and JR 811. At this point, I am impressed with this system. PM me if you would like to see discharge curves for this battery that I have run.

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05-04-2005 07:00 AM  13 years agoPost 5
Tek

rrVeteran

Yukon, OK USA

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Do you have a link to those packs? I might just have to try some Li-pos.

-------Does it fly?-------

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05-04-2005 07:10 AM  13 years agoPost 6
Tri135

rrApprentice

San Diego, CA

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fromeco.org

The packs are Li-Ions, but for radio packs they are preferable.

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05-04-2005 11:23 PM  13 years agoPost 7
skyhawk172n

rrNovice

Forest, MS USA

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Not trying to hijack a thread, but does anyone know why a F401 gyro and F9254 servo specify 4.8 volts and nicds only vs. 6.0 and lipos? The equipment shouldn't know where DC voltage is coming from. I have used 6.0 on analog Futabas for years without trouble, but this will be my first shot at digitals so don't want to see any smoke!

Roy

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05-05-2005 01:35 AM  13 years agoPost 8
Tek

rrVeteran

Yukon, OK USA

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They do not recommend over 4.8v on the GY401 because it was not made to handle more voltage. It will probably still work, but the life of the electronics will be diminished if it does not fry.

-------Does it fly?-------

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05-05-2005 02:25 AM  13 years agoPost 9
Tri135

rrApprentice

San Diego, CA

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I don'tnow why you say they don't recomend more than 4.8 volts, when the instructions for the GY-401 state that the operating voltage range is 4-6VDCV.

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05-05-2005 04:15 AM  13 years agoPost 10
skyhawk172n

rrNovice

Forest, MS USA

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TRI135,

On the back of the packages for the 401 and the 9254, instructions state for 4.8volts, nicd only. I didn't look at the paperwork inside the box.
Besides, who reads the directions ! I guess since we only run 5 servos in a heli 4.8 is ok. In most of my planes, I have 5 or more high torquer's, and weight is not so critical; I've ran 6.0 for a long time and didn't think about modern equipment not being set up for it. I'm flying Li-polys in my electrics, and am beginning to switch to them in glow planes, using a regulator, of course (6.0vdc) The NiCd only statement surely buffalos me, because DC power is the same out of a NiCd or the accessory drive of a turbine powered Jetranger. Could both of these requirements have anything to do with too many attorneys with too little (productive work) to do?
Just a thought...

Roy

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05-05-2005 04:25 AM  13 years agoPost 11
Tri135

rrApprentice

San Diego, CA

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That is interesting. I don't have the package anymore. I just looked at the Futaba website. That is where I got the info. You are probably right about the lawyers.

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05-05-2005 05:51 AM  13 years agoPost 12
rcheliflyer

rrKey Veteran

calif., usa

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There are some posts somewhere, but as I understood it the 6v thing
was that a freshly charged pack is way over 6v and that's where the prob is, a regulated 6v pack is ok.

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05-05-2005 04:59 PM  13 years agoPost 13
cdyckes

rrVeteran

Nr. Yeovil, Somerset - UK

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Almost certainly because Futaba optimised the closed-loop response of the servo/motor electronics for 4.8v. Going to 6V may be OK (haven't tried it) as far as the electronics standing it, but the faster motor movement is likely to give a less stable response following a movement command (overshoot/ slight oscillation about new servo position).

There are a lot of factors to take into account when designing closed loop servo systems!

Colin

Colin

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05-05-2005 05:35 PM  13 years agoPost 14
skyhawk172n

rrNovice

Forest, MS USA

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Ok, that sounds good enough to me. I'll stick with a large 4.8 and not tempt disaster.
Thanks,
Roy

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05-05-2005 05:56 PM  13 years agoPost 15
Tek

rrVeteran

Yukon, OK USA

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Thanks everyone for hijacking my thread. Please make a new one next time.

-------Does it fly?-------

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05-05-2005 11:20 PM  13 years agoPost 16
skyhawk172n

rrNovice

Forest, MS USA

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Won't happen again. Hoped I was adding to the discussion, not detracting. Sorry!
Roy

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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Need advice on replacing RX packs.
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