[NSRCA-discussion] electric brain fart have a nice chuckle

[Chad Northeast]

I didnt mean to imply that you cant 2 or 3C charge, I have been doing it 
on 3s 2100's from charge #1 (mostly 2C rate) :)  Definately fast!  I am 
just not convinced yet that there is no damage to the packs from doing 
it!  I only have 15 cycles on them though so it will be a while yet 
before I know.  I am now comfortable in leaving the packs over the 
winter, which in our climate is an important piece of info as most will 
be forced into that situation :)  Those of you in the south are lucky! :)

I have my packs all wired up permanently as 10s packs, so >1C charging 
is not an option unless I rewire the packs.  At a contest I agree you 
dont need that many packs to get through the rounds easily...provided 
you remember to charge them lol.  For me I really hate charging at the 
field, and often I dont have time to do it anyways....so I went the lots 
of packs route.  Hopefully they hold up well over time.

Chad

Steven Maxwell wrote:

>  Good points Chad, my point was more of monetary of startup cost for 
> some that feel it's just to expensive, money that could spent on 
> generators or family. The newest Safety Instructions from Thunder 
> Power states that "3c charging can be done on only prolite 
> 910,1320,2000,and 2100 using only the TP 1010 charger in conjunction 
> with TP balancer" as you know that the 5300 is made up of 4 1320's.
>  I know of one person that is charging at1.5C without any problems.
> * I'm in no way suggesting that everyone try this, *only people with 
> experience, knowledge, and good safety practices try this. Also in the 
> hope that this will spark someone to get some real data.
>  Today with 2 packs and only one charger I flew as much as I wanted in 
> fact my biggest thing was waiting for the motor to cool to ambient 
> before I could fly again.
>  I'm not a chemical engineer so I'm not sure how all this plays out 
> discharge at 35-65 amps and can only charge at 5 amps just don't make 
> sense to me, the future will tell how all this plays out.
>  Everyone please be careful when doing anything out of the ordinary 
> and never charge at wrong volts (cell count).
>  Thanks for your reply Chad I was hoping to get many involved in this 
> discussion with as much experience as you.
>
> Steven Maxwell
>  
>  
>
>
> > [Original Message]
> > From: Chad Northeast <chad at f3acanada.org>
> > To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
> > Date: 6/12/2006 11:12:52 PM
> > Subject: Re: [NSRCA-discussion] electric brain fart have a nice chuckle
> >
> > Regarding shelf life...
> >
> > I just got a couple of new sets of 5300's....and compared them to my
> > packs from last year with the micro logger (in flight data)....the 
> packs
> > sat around all winter with basically no use, and very little control of
> > storage voltage.
> >
> > The old packs perform identical to the new ones, in air performance is
> > not different enough tell them apart really.  The packs that sat over
> > winter did take a few cycles to get back up to par! though.
> >
> > Soooo....I dont think packs sitting for a winter is all that bad for
> > them.  It can probably be argued that 2C charging is more harmful to 
> the
> > lifespan than sitting on the shelf is....but there is not enough
> > information to form that as a factual conclusion :)
> >
> >
> >
> > Steven Maxwell wrote:
> >
> > >  I have about 38 flight on the new electric Smaracea (smaragd wings
> > > and stab and Panacea fuse) Hacker C50-14XL, Jeti 90 controller, TP 
> 10s
> > > 5300, made my third flight today in about 13 MPH winds for some 
> reason
> > > I felt I was losing power starting at the 1/2 hourglass ( P-07) so on
> > > landing ran the throttle trim back to center to stop motor as usual
> > > and for some reason I went up front to spin the prop man it's tight,
> > > just regreased with new grease 6 flights ago, dejected to say the
> > > least that ! something was wrong, carried it back to the flight 
> stands
> > > ; unplugged big batteries and receiver battery, went back up front to
> > > spin the prop again, smooth as silk, well crap whats this, Denny my
> > > flying buddy said could it be programming, Duh we have brake active,
> > > plugged everything back in included watt'sup meter and ran throttle
> > > trim up took meter reading and 65.75 amps same as new, brought trim
> > > back to center and yes the motor was tight again, the brake works 
> well
> > > LOL, hope youal! l get a good laugh out of this we did.
> > >  As  side note I'm convinced that if you at contest that fly's every
> > > class one round at a time you can get by with one set of batteries 
> for
> > > pattern, this has to be done with 2 chargers capable 10 amps and cell
> > > balancing, charging at 2c, charging in less that 30 minutes, no cool
> > > down after flight *(if batteries are not really hot under say 140
> > &g! t; degrees F and never fly more than one pattern (P-07)* I've 
> tested this
> > > and works well, so the expense is much lower than expected, chargers
> > > are cheaper than batteries, this will also do other things like 
> better
> > > shelf life for batteries, it's been my felling that having to many
> > > packs that you can't get enough flights for many years to get full
> > > value out of batteries. Using just one set a year will bring cost 
> down
> > > to less than buying fuel for most people, I would love to prove this
> > > but we fly back to back rounds at our contest so I have to have 2
> > > packs. Would love to hear others comments.
> > > 
> > > Steven Maxwell
> > > 
> > >
> > 
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