[NSRCA-discussion] Receiver packs

Sat Feb 14 11:17:10 AKST 2009

Hi Rex, I am on the opposite end of this. I still rely on the abuse and
neglect tolerant NiCad. 30 years ago NiCad's weren't as reliable as they are
now but I have yet to loose an airplane due to battery problem. The bottom
line is to know your equipment.
Jim

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Rex
Sent: Saturday, February 14, 2009 11:13 AM
To: NSRCA-discussion
Subject: Re: [NSRCA-discussion] Receiver packs

I've been using 2 cell lipo's for quite a few years for my receiver/servo
power.  I treat them just like any
other part that goes into a $3k plane...  I break them in and test them in a
little foamie plane.  I torture
them enough to see that they have the capacity that they should.  I
generally fly them five or six cycles
before I actually put them in the pattern ship.   I use them for two
seasons, then change them out for
new ones.  I haven't had any reliability problems whatsoever, using lipos in
this manner.

Rex

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From: pamrich47 at hotmail.com
To: nsrca-discussion at lists.nsrca.org
Date: Sat, 14 Feb 2009 12:37:42 -0600
Subject: Re: [NSRCA-discussion] Receiver packs

Jerry--just a couple thoughts:  I will probably never use a battery for a
receiver/flight pack again that I haven't been in charge of its history.  If
you've been paying attention to its characteristics since new, we can
generally tell when they start to lose capacity--and for me, there was a
point on the ESV when it got there, I got a little nervous about going up
'one more time'.  When it would approach that point after about five
flights, then I would figure it was 1. if early in its career--then to cycle
and 2. if in to the second or third year(sometimes longer) it was time to
retire it.  Nicads for me have been pretty reliable that way and I've been
comfortable running one pack.  You can still go to five cells in nicads for
additional capacity and power with a regulator and still have that
reliability.  I think most of the guys that have gone to lipos can enjoy the
increased capacity and power along with an increased discharge rate in a
smaller, lighter package.  But I don't get the impression that they trust
them like nicads.  Probably the best thing to do is monitor your batteries
of any type with a good, loaded ESV to keep an eye out for any unusual
battery behavior.  The two battery debate is a little like the single versus
twin debate in full scale airplanes--some guys think twins just have double
the chances to fail.
All that said, I understand some of the new receivers are a little touchy
regarding low voltage situations.  I had an older receiver in an airplane
that I bought used with a 'new' battery--turned out the battery was bad--but
got a warning(hold) and was able to land--but showed NO volts afterward.
Chances are with the newer stuff, it may not have made it back on the ground
in one piece.  So using a 5 cell nicad or 2 cell lipo with regulator may not
be a bad idea and monitor with a good loaded ESV.
FWIW
Richard

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From: jjvoth at mtelco.net
To: nsrca-discussion at lists.nsrca.org
Date: Fri, 13 Feb 2009 20:32:46 -0600
Subject: Re: [NSRCA-discussion] Receiver packs

Thanks for the info guys
----- Original Message -----
From: Vicente "Vince" Bortone <mailto:vicenterc at comcast.net>
To: General pattern discussion <mailto:nsrca-discussion at lists.nsrca.org>
Sent: Friday, February 13, 2009 8:28 PM
Subject: Re: [NSRCA-discussion] Receiver packs

Hi Jerry,

I have been using two li-po using the tech-aero double regulator
http://www.tech-aero.net/plr5-dr2.htm  The capacity I am using now is 930
mah, 2 cells  batteries.  I know that I can fly at least 6-8 times.  After
that, I am brain dead.

VB

----- Original Message -----
From: "Richard Strickland" < pamrich47 at hotmail.com
<mailto:pamrich47 at hotmail.com> >
To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>
Sent: Friday, February 13, 2009 8:01:03 PM GMT -06:00 US/Canada Central
Subject: Re: [NSRCA-discussion] Receiver packs

Jerry, I think the short answer is no.  But there has been much discussion
regarding dual packs for back-up.  An example ot single pack usage is using
a 2 cell lipo at around 780-800ma for practice and 340-380ma for contests to
make weight.  These are used with voltage regulators with variing outputs.
RS

> From: jjvoth at mtelco.net
> To: nsrca-discussion at lists.nsrca.org
> Date: Fri, 13 Feb 2009 17:32:25 -0600
> Subject: Re: [NSRCA-discussion] Receiver packs
>
> Sorry, I said that wrong. I meant are two packs needed to power the flight
> pack.
> ----- Original Message -----
> From: "Jerry Voth" <jjvoth at mtelco.net>
> To: "NSRCA" <nsrca-discussion at lists.nsrca.org>
> Sent: Friday, February 13, 2009 5:23 PM
> Subject: [NSRCA-discussion] Receiver packs
>
>
> > This has probably come up many times but I'd like to know if it's
> > necessary
> > to use two Li-Fe packs for the radio and servos
> > _______________________________________________
> > NSRCA-discussion mailing list
> > NSRCA-discussion at lists.nsrca.org
> > http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
> >
>
>
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