Probably a dumb question that was asked at the Flying field today, but no one had an answer!

When you are using a 4.8 Volt/4 Cell Pack and generally when the pack reaches say for example 4.2 Volts, you can still fly but need to consider recharging the pack thereafter; so on a 6.0 Volt/5 Cell pack, can you fly if this pack gets down to 4.2 volts as well?

Sorry in advance if its a dumb question!

Not a dumb question and no dumping a six cell pack that low would be less than the total discharged state per cell and even possibly cause one or more cell reversals.

I find all my five cell packs in a fresh charge state usually show just over about seven volts and being quite conservative I like to not go lower than about six point four.

John

I hate to disagree with John as he is most always correct but I have found that it is safe to drop down to 1.1 volt per cell if using Nixx type cells; they still have about 5 to 10% of their energy at that voltage. Of course discretion is the better part of valor though so it does not hurt to be a bit on the conservative side.

To directly answer the question in one word............NO
Now then, I'll kinda split the difference between John and Rodney's minimum voltage levels, but then I do like to go on the more conservative side.
That said, I don't fly any of my gas/glow planes with Nixx packs anymore
Pete

And 1.1 volts per cell is still 5.5 volts or well above the 4.2 the OP was asking about. Either way, that is getting very close to being completely discharged as 1.1 v is considered fully discharged for testing purposes. When using these batteries, I was much more conservative than that and for a 5 cell pack, 6 volts seemed like a good place to stop and recharge.

Like pilotpete2 though, I've pretty much changed everything but a few transmitters over to A123 LiFe batteries these days so the Nixx info is becoming a distant memory.