[lektrik_flyers] Re: (No To: lektrik_flyers@freelists.org
- From: Bill Beavers <bbeavers57@xxxxxxxxx>
- To: lektrik_flyers@xxxxxxxxxxxxx
- Date: Tue, 29 Mar 2005 07:51:04 -0800 (PST)
Ok... well that is a good place to start because that
"C" rating was my same concern when I first started
messing with Li-Po batteries. Basically, it is pretty
straight forward when you kind of get the hang of it,
but it took me a long time to to fully understand what
they were talking about. the C stands for Capacity of
the battery, and it is important in both the charge
rate (the speed at which you can charge a Li-po
without blowing it up), and the disCharge rate (the
rate as to how fast you can suck the juice out of that
battery without overheating it or blowing it up).
Batteries are rated in Amp Hours, or in the case of
the size batteries we use, mAh (milli amp hours). So
lets say you have a 1000 mah (1000 milli amp hour)
battery. the charge rate for this battery at 1C (1 C
is the charge rate to charge it to capacity at normal
speed basically) would be 1.0 Amps at voltage rating
(ie 7.4 or 11.1, etc.) for the recommended time for
the charger used. Since I use a Triton charger, all I
do for a Li-Po battery that is say 1000mah like the
example used, is set the charger to the voltage type
(ie 7.4v or 11.1v), set the amperage to 1.0 amps (this
is calculated by the charger and yields the milliamps
needed for charging). Then the charger does the rest.
These same charge traits apply to NiCD and NiMH
(Nickel Cadnium and Nickel Metal Hydride) batteries
too, but they can be tampered with more on non Li-po
batteries. You don't really want to try to quick
charge a Li-Po. They are volitile! I may not have
explained that as well as I would like to have above,
but if that above doesn't make sense, maybe we can get
you to the airfield and go over some of that.
--- Gordon and Betty Bailey <baileyark@xxxxxxxxx>
wrote:
> Thanks Bill,
> Well, to start with, I bought a watt meter (watts up
> brand) and need to know how to use it......there are
> 20 plus pages of instructions only two of which seem
> to make any sense at all as far as getting useful
> information from the machine. I have been able to
> figure out estimated flight time, but the other
> things like efficiency, the likelihood of burning
> something up and everything else escape me. Maybe
> it is my old fossilized mind.....67. I have been
> told that all lipo batteries have a C
> rating........news to me and I have read lots of
> magazines and chat room threads. What does C stand
> for and how do I find out what it is?
>
> Enough for now.......will try to come see you guys
> soon.
>
> Gordon
> ----- Original Message -----
> From: Bill Beavers
> To: undisclosed-recipients:
> Sent: Tuesday, March 29, 2005 9:08 AM
> Subject: [lektrik_flyers] Re: (No To:
> lektrik_flyers@xxxxxxxxxxxxx
>
>
> Hmmmm... Gordon, there probably are, but for me I
> have
> always learned this stuff by just digging around,
> and
> when I see a term I don't understand, I just hit
> the
> Internet and find related topics about it, or just
> brace up, cover my embarrassment and ask my fellow
> flyers <blush>... for example, I keep forgetting
> what
> NOTAM means that John Cooper uses everytime he is
> ready to hit the field (I think that is an old
> military term used a LOT by guys like Captain
> Cooper
> <grin>) and had to ask David Reid the other day
> again
> the other day to finally remember that it is
> NOtice To
> AirMen, or something close to that! :D
>
> Tell you what, feel free to throw ANY and ALL
> terms,
> Acronyms, etc., you want onto this list, and I am
> sure
> we can ALL give you 5 or 6 different versions of
> what
> that means! :D hee hee... just because we
> sometimes
> understand some of this stuff slightly
> differently. I
> haven't been much of a book person on this stuff,
> it
> is by the seat of your pants mostly, and talking
> to
> your fellow flyers.
>
> If you can get with us at the airfield your
> knowledge
> bank will go up quickly, or become totally corrupt
> depending on our own understanding of stuff! hee
> hee
>
> --- Gordon and Betty Bailey <baileyark@xxxxxxxxx>
> wrote:
> > Guys,
> > Are there any books available that go into the
> > basics of this RC flying game?? I need the
> > kindergarten stuff... Like terminology,
> > electronics, aircraft design and function. My
> > experience with other fields this complicated is
> > that the "books for beginners" tend to be too
> > advanced to do an ignorant guy like me any good,
> or
> > they are mainly just pretty pictures.
> >
> > thanks,
> > Gordon
> >
> >
>
> Bill Beavers
> Director of Technology and Distance Learning
> Arch Ford Education Cooperative
> bbeavers@xxxxxxxxxxxxxxxxx
> http://af1.afsc.k12.ar.us
>
>
>
> __________________________________
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>
>
>
>
Bill Beavers
Director of Technology and Distance Learning
Arch Ford Education Cooperative
bbeavers@xxxxxxxxxxxxxxxxx
http://af1.afsc.k12.ar.us
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