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12-04-2005 07:50 AM  12 years agoPost 1
shmulik_g

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tel aviv Israel

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is there any probleme with that or should i use only Nicd?
tnx
Shmulik

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12-04-2005 07:55 AM  12 years agoPost 2
spritefiend

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Camarillo, CA

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i run 2 helis with 9253's and 1 with 9254 on high capacity nimhs. 4000mah 4/3au cells, works dandy.

i am planning a change to sub-c's however, but id imagine that size cell is better than what i am already using.

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12-04-2005 05:41 PM  12 years agoPost 3
perfesser zero

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Dublin, VA., USA

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NIMH...

I'm using 2400mah NIMH on two heli's here with 9253's and have had no problem "YET". However, I usually only fly each heli three times on an outing before they get packed up and taken home. I'm also not doing any 3D stuff. I'm just doing mild aerobatics right now (loops, rolls and some stall turns). If I do fly them more than three times each, I field charge the batteries after the third flight. I may be pushing my luck with the 2400mah batt's, which is why I've been working up some 4/3ah batteries here for the helis. I've not tried them yet as the weather here is not good for flying right now. I've cycled the 4/3ah batt's and find I can get more than 120+ minutes out of them at the 500mah discharge rate. Which in my case should be enough to get by with, as I fly each heli for a good 20 minutes each flight for a total of 60 minutes each.

Later...

Tiger 50 - OS 50SX-H
Hawk Sport - OS 37SZ-H
Raptor 30 - OS 37SZ-H
JR 10X/R950S

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12-04-2005 05:54 PM  12 years agoPost 4
playfair

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Rochester, NY

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Sub C, A, and sub A NiMh cells generally have low internal resistance and good discharge capabilities. Not sure about the longer A size, (4/3). Stay away from AA cells.

Perfessor, if you're testing cell capacity, you should discharge at 1 amp MINIMUM, 1.5-2.0 is better. "Enough to get by with" should not be our goal with a $1k flying machete!


The sky is our canvas

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12-04-2005 06:03 PM  12 years agoPost 5
nojohnny101

rrElite Veteran

10 miles north of Cincy, OHIO

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hey
i got a 3300 NIMH pack....sub-c.....been running the 9253 for over a year now....no problemo!

Thanks
~Will~

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12-04-2005 06:59 PM  12 years agoPost 6
Nigel Gordon

rrApprentice

United Kingdom

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NIMH

Just be a bit careful as the NIMH in my experience will drop off at the end very quick, I fly with Sanyo Graupner 3300NIMH battery packs in 2 of my machines, with digitals alround and GV-1's with 601 gyros.
Generally I get around five or six flights from them in 90 size ships then go for a charge, they take between 1800 / 2100 ma to top them right up so when flying I am taking out about 400 - 500 mah per 13 minute flight.
Hope this helps a little.

Nigel

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12-04-2005 08:11 PM  12 years agoPost 7
perfesser zero

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Dublin, VA., USA

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playfair...

[quote]
Sub C, A, and sub A NiMh cells generally have low internal resistance and good discharge capabilities. Not sure about the longer A size, (4/3). Stay away from AA cells.
[quote]

Just what is the problem with the AA cells? Been using them for some time now and have either been lucky, stupid or both!!! Where can I find info on the 4/3 A's? I have a pile of them here.

[quote]
Perfessor, if you're testing cell capacity, you should discharge at 1 amp MINIMUM, 1.5-2.0 is better. "Enough to get by with" should not be our goal with a $1k flying machete!
[quote]

I agree on the flying machete...the tips of the CF blades I'm running are really sharp!!! I don't fly enough on a pack before I recharge it and it's usually just one or two more flights anyway. I keep a good eye on the packs from flight to flight. If in doubt I charge them. Of course this doesn't help any if they go bad in flight, but then nothing will. This is why I'm looking into the 4/3 A's, to see if they have anything that will help on the discharge time length between flights. I don't fly with but one digital anyway...if that makes any difference. My charger/cycler doesn't do anymore than 500mah discharge rate. I'll either need a new charger/cycler or find a cycler that will monitor that kind discharge rate. Thanks for the info though!

Later...

Tiger 50 - OS 50SX-H
Hawk Sport - OS 37SZ-H
Raptor 30 - OS 37SZ-H
JR 10X/R950S

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12-05-2005 01:42 AM  12 years agoPost 8
spritefiend

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Camarillo, CA

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4/3s a cells have been pretty good to me, i use the 4000mah packs from radicalrc.com and theyre pretty decent batteries, even on full digital setup. though they werent so great that i regret getting duralites and flying all day on a single charge. that i dont think you will get out of any non lithium battery in a digital setup.

the only reason im going to sub-c's is the fact my helicopters are still a little light in the nose so i need a tad more weight.

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12-05-2005 07:17 AM  12 years agoPost 9
shmulik_g

rrNovice

tel aviv Israel

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i got the massege....

i will keep on flying with my 1500mh Nicd
any recommendation for a good field charger?
tnx
Shmulik

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12-05-2005 12:58 PM  12 years agoPost 10
perfesser zero

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Dublin, VA., USA

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spritefiend...

So you like the 4/3 A's? If they are doing fine for you, I may just go ahead and use the ones I have here. I have three packs made up and they all show up very close to 3000mahs on the discharger. They are 3000mah rated, so I should be good with these until I find out differently.

Later...

Tiger 50 - OS 50SX-H
Hawk Sport - OS 37SZ-H
Raptor 30 - OS 37SZ-H
JR 10X/R950S

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12-05-2005 04:37 PM  12 years agoPost 11
spritefiend

rrKey Veteran

Camarillo, CA

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yea theyre good batteries.

on my 9402/9202 setup i get 4-5 flights before recharge on a 4000mah pack, which is acceptable for what im using them for.

3000mah is a pretty respectable pack just keep an eye on your voltage with a meter(preferably with load) and if they put out to your liking your set. i keep mine above 4.85v on a 1a load, wont fly it lower than 4.90v w/ 1a load.

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12-05-2005 07:17 PM  12 years agoPost 12
perfesser zero

rrKey Veteran

Dublin, VA., USA

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4/3 A's...

Well I'm only flying with one digital servo at the moment, so I'm not really sure this effects me to the same degree it does someone who flying all digitals. I'll keep this in mind later when I've got more digitals on board. Thanks for the info.

Later...

Tiger 50 - OS 50SX-H
Hawk Sport - OS 37SZ-H
Raptor 30 - OS 37SZ-H
JR 10X/R950S

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12-13-2005 04:47 AM  12 years agoPost 13
perfesser zero

rrKey Veteran

Dublin, VA., USA

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New development on the need for better...

NIMH batt's! I've gone and bought a set of digitals for the Hawk. I'm hoping this will help a little with the centering of the pitch and roll axis on the heli. At this time I have standard servos and it will not stay still very long in a hover. It'll drift off rather quickly and trimming it makes no difference. The servos are dual BB and are still very tight, but obviously they don't center to well. We'll see how the new digitals work on the Hawk. Since the weather here is "Frightful". I'll not be flying for a while. Maybe during Christmas break.

Later...

Tiger 50 - OS 50SX-H
Hawk Sport - OS 37SZ-H
Raptor 30 - OS 37SZ-H
JR 10X/R950S

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