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Minimum reciever voltage?

Old 09-09-2010, 08:27 PM
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1wrangler
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Default Minimum reciever voltage?

I just recieved my fancy new 6 volt reciever battery and I am wondering at what voltage Ishould stop flying. My voltmeter has a "green" (safe) range from 4.8 to 5.7 volts. With my 4.8 volt pack, I fly until 4.8 is indicated with the volt meter. Is it the same with this new 6 volt? BTW, I am running Futaba Faast 2.4. Thanks!
Old 09-09-2010, 08:30 PM
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DMcQuinn
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Default RE: Minimum reciever voltage?

If you stop flying at 6.0 volts you will be very, very safe. A good condition 5-cell battery (NiMh) will probably hit 6.0 volts when it is about half used up. So you'll have a big safety margin.
Old 09-09-2010, 08:41 PM
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1wrangler
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Default RE: Minimum reciever voltage?

Hmm, I guess what I'm asking is: would it be bad to run this 6 volt battery down to 5 volts before calling it quits?
Old 09-09-2010, 09:10 PM
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Default RE: Minimum reciever voltage?

I have never tried to see how far down it would go but I have been known to get them at 5.2 without crashing.
Old 09-09-2010, 09:16 PM
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1wrangler
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Default RE: Minimum reciever voltage?

Got it, thanks guys!
Old 09-10-2010, 05:36 AM
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Default RE: Minimum reciever voltage?

A good rule of thumb to follow with Nickel (Nimh or NiCd) is 1.1 volts /cell is fully discharged. With a 6 volt battery, there are 5 cells.

The typical discharge curve for these batteries has a fully charged voltage of about 1.45 volts/cell, which quickly drops down to around 1.25 volts per cell while using. They then discharge fairly linearly down to about 1.15 volts/cell . After that they drop quickly. If you discharge a 5 cell battery down to 5 volts, you're going below the normal fully discharged curve. Depending on your current draw, you may pull it down below 3 volts in flight and your reciever will cease to function. Your "time to quit" voltage with a 6 volt battery should be around 5.7-5.8 volts.

The voltwatch your using is for a 4 cell pack. You should replace it with one designed for the 5 cell (6 volt) battery.

Brad
Old 09-11-2010, 09:27 AM
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Roo Man
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Default RE: Minimum reciever voltage?

Is the voltage you refer to, with load or without?

Gary
Old 09-11-2010, 09:44 AM
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LesUyeda
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Default RE: Minimum reciever voltage?

With load. Without load, the cells will very rapidly return to normal voltage.

Les

p.s. And exercise the servos while you are doing it.
Old 09-11-2010, 09:51 AM
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Default RE: Minimum reciever voltage?

Thanks,

Gary

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