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HomeAircraftHelicopterHelicopter Main Discussion › Question when batts go low.........
10-13-2005 01:53 AM  13 years agoPost 1
Dblex

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Texas

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I finally have the ability to fly 4 tanks or so without "losing" it mentally or getting the shakes too bad...LOL

After the 4th tank the engine was acting funny and when flipping the heli, got flutter for the first time all evening.....

so getting nervous, I bring her back around and notice my batt indicator light has hesitation in it...meaning low batt soon!!!

so bring her back and call it a night.

So, my question is...when the batteries get low does the heli act sluggish with all movements? this was a first for me, but I did notice throttle response was a bit slow...blade flutter coming when I gave hard collective.

is all this pretty normal? just a learning experience for me....and Im not afraid to ask.

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10-13-2005 02:09 AM  13 years agoPost 2
E30TECH

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Jefferson, New Jersey

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according to Rays manual, you have about 30 seconds after that point before you lose all control.

I just read it last night. I have to go back and reread the whole book since I took a year off.

I would consider a larger capacity battery if you are only getting 4 flights.

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10-13-2005 02:16 AM  13 years agoPost 3
HERRORHH

rrNovice

North Carolina

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4 Flights per charge???
Is there not a way to do a battery change easily between flights?

If you don't have time to do it right the first time...When will you have time to do it again?

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10-13-2005 02:30 AM  13 years agoPost 4
Dblex

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Texas

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No...I had flown the day before and forgot to charge...checked batteries in heli with my BR-2000 and it showed good...she must have dropped fast...you see Im finally flying her hard and I assume this too is eating the batts up...but as for getting a bigger pack....


HECK YA!!

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10-13-2005 02:39 AM  13 years agoPost 5
B.T.D.T.

rrElite Veteran

NY

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When taking a voltage reading on your BR-2000, make sure you start the discharge at 1 amp to put a load on the batteries for a true reading. Otherwise you have not load and only reading a surface valtage. Don't leave it on discharge mode too long or you will be draining your battery.

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10-13-2005 02:40 AM  13 years agoPost 6
Dblex

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Texas

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good tip! thanks!

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10-13-2005 02:58 AM  13 years agoPost 7
MicroDOC

rrVeteran

Goleta, CA

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What battery are you using? I use a 4.8v 2100 mAh NiMh and don't have any problems after a half day, but I don't do any heavy duty 3D or tax the servos. I also generally have a fully charged backup battery pack that I can swap out if it gets low. I've never had to do that yet.

Experience is something you don't get until just after you need it!

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10-13-2005 03:26 AM  13 years agoPost 8
Helibras

rrApprentice

São Paulo, Brazil

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4 flight for me either using a GY401/ 9254 combo and one KO 2001FET with a 1500mAh NiCd. Other servos are standards JR531.


Is it too low?


Gravity... the force to be defeated
Raptor 50SE; Hyper
Vigor CS; OS 91C-Spec MPII

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10-13-2005 03:28 AM  13 years agoPost 9
Dblex

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Texas

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4.8 1000 mah, i know i know

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10-13-2005 04:36 AM  13 years agoPost 10
darkfa8

rrElite Veteran

Brick, NJ - USA

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I have a BR2000 as well, and putting it into discharge mode for 3-5 seconds is a good test for the battery.

I'm running a 6vdc Sanyo CP-2400SCR pack through a Fromeco Arizona regulator regulated to 5vdc for all avionics.

With the 1amp BR2000 discharge it took over an hour for the Rx pack to drop from 7.1vdc to 6.0vdc..should be good for 5-6 flights, maybe more with my eCCPM Tiger 50.

I use a Sirius Pro Plus charger for the Rx & Tx batteries. Just keeps my battery system simple.

- Dan Goldstein
Team Revolectrix

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10-13-2005 01:05 PM  13 years agoPost 11
Rui_JC

rrVeteran

Portugal

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Guys, i have a 1400mah NiCd pack and after a 8 minutes flight my indicator gets instable.

I recently experienced some tail vibration ( up & down ) ( all mechanics ok ) and i think it's the gyro failing due to low battery.

I have installed a second 1400mah pack and will use them both in parellel !!!!

Are NiMh pack ok to use with Futaba electronics?
My futaba 3010 servo manuals say to use only NiCd !!!!!!!
Why ?????

Keep it up...literally

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10-13-2005 02:07 PM  13 years agoPost 12
BarracudaHockey

rrMaster

Jacksonville FL

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Most of the modern NiMH don't suffer the low discharge rates that the first generation did, thats where that warning came from, they couldn't deliver the amps that NiCads could.

1000 mah and you got 4 flights? You were really pushing your luck. As someone said, always check a battery before the first flight and post flight thereafter with a load to get an accurate idea. If you let it sit a while between flights the voltage will creep back up.

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

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