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HelicopterMain Discussion › How low before you stop flying?
04-26-2004 05:46 PM  13 years agoPost 1
yugi

rrVeteran

Maryland

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What is the recommended voltage to stop flying at, on a 2400Mah, 4.8 volt Nicd with ALL JR 8411 servos? When using a volt meter load tester under a 2.0a load on a full charge it is around 4.8 to 4.9 already, With no load it’s around 5.5 to 5.6?


Thanks,

yugi

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04-26-2004 07:22 PM  13 years agoPost 2
G4YVM

rrApprentice

Salisbury, Wilts. England.

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When the on-board nicad chequer shows amber I recharge with the field charger. I don't care about volts...too hard. I understand GREEN and AMBER.

David

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04-26-2004 07:50 PM  13 years agoPost 3
allns47

rrKey Veteran

Richmond IN.

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I have the same set-up on my raptor 30..I fly about six ,6 min. flights and then quick charge it before I fly again....Those digital servos use alot of juice even more when you use a hh gyro and digital servo on the tail rudder.......

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04-26-2004 08:30 PM  13 years agoPost 4
Dr Lodge

rrElite Veteran

Guildford, Surrey - UK

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If your charger discharges and tells you the amount of capacity taken out and put in, simple:
- fly x number of flights on a fresh pack
- discharge at 1 amp or so and see what capacity remains
- work out how many flights you can get out of a pack

on my 2400mAh, say I get that capacity.
I do 3 flights, then discharge to empty (3.6 volts) and charge takes out another 1200mAh, so theoretically I can get 6 flights.

So I limit that to 5 max.

If under 2amp load, the voltage is 4.8 volts, you probably have plenty left, I would suggest its over 1/2 full. But above test tells you exactly how much.

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04-26-2004 08:47 PM  13 years agoPost 5
Chuckie

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Crofton Maryland

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I agree with Dr Lodge,

I’m using the new Sanyo 2400mah C cells in my Furys which are equipped with 4 futaba 9252s, 601 gyro/9251 servo, and GV-1. I can fly 6 flights and only use 2000mah. My other packs were 1800mah and I would only get 3 to 4 flights on a fully charge.

I use a measure of amount of time flying, which give me mah used per flight, versus the fully charged battery state to indicate when I should recharge or stop flying. I use the voltage indication as a backup for when a cell dies or as a second check.

Chuckie

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04-26-2004 11:07 PM  13 years agoPost 6
jag01

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Pennsylvania

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4.4 volts is the time to recharge for nicad packs.


Keep them blades turning !

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04-27-2004 12:43 AM  13 years agoPost 7
Jeff H

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Cincinnati, OH

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I put my packs under a 500mah load (the max that my volt meter can do) before flight, if it can't sustain a voltage in the green, its time to recharge. I usually get just 2 flights on a 1800 ni-cad pack. Sure this is a conservative approach, but my reasoning is that if the pack can't maintain a decent voltage under a small load, what kind of voltage does it drop to under a high stress in flight condition.

Consequently, I've never had any battery related issues


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HelicopterMain Discussion › How low before you stop flying?
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