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Having had some battery problems in the past, I am now using two
completely independent battery circuits with two tech-aero
switch/regulators set to the same value. Using the switches I confirm
that each circuit is working prior to takeoff. When recharging, I
confirm that the ratio of charge used from each battery is relatively
constant.<br>
This insures that I will never take off with only one system
functional, and I will notice a weakening battery immediately after
recharging. I'm using two 800 mah lipos.<br>
<br>
John<br>
<br>
Rex wrote:
<blockquote cite="mid:BAY119-W216B295A6DDA33501F2B9BCCB90@phx.gbl"
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</style>I've been using 2 cell lipo's for quite a few years for my
receiver/servo power. I treat them just like any<br>
other part that goes into a $3k plane... I break them in and test
them in a little foamie plane. I torture <br>
them enough to see that they have the capacity that they should. I
generally fly them five or six cycles <br>
before I actually put them in the pattern ship. I use them for two
seasons, then change them out for <br>
new ones. I haven't had any reliability problems whatsoever, using
lipos in this manner.<br>
<br>
Rex<br>
<br>
<br>
<hr id="stopSpelling">
<br>
From: <a class="moz-txt-link-abbreviated" href="mailto:pamrich47@hotmail.com">pamrich47@hotmail.com</a><br>
To: <a class="moz-txt-link-abbreviated" href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a><br>
Date: Sat, 14 Feb 2009 12:37:42 -0600<br>
Subject: Re: [NSRCA-discussion] Receiver packs<br>
<br>
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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.<br>
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. <br>
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.<br>
FWIW<br>
Richard<br>
<br>
<br>
<hr id="EC_stopSpelling">
<br>
From: <a class="moz-txt-link-abbreviated" href="mailto:jjvoth@mtelco.net">jjvoth@mtelco.net</a><br>
To: <a class="moz-txt-link-abbreviated" href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a><br>
Date: Fri, 13 Feb 2009 20:32:46 -0600<br>
Subject: Re: [NSRCA-discussion] Receiver packs<br>
<br>
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<div><font face="Arial" size="2">Thanks for the info guys</font></div>
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<div
style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">-----
Original Message ----- </div>
<div
style="background: rgb(228, 228, 228) none repeat scroll 0%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial; font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>From:</b>
<a moz-do-not-send="true" title="vicenterc@comcast.net"
href="mailto:vicenterc@comcast.net">Vicente "Vince" Bortone</a> </div>
<div
style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>To:</b>
<a moz-do-not-send="true" title="nsrca-discussion@lists.nsrca.org"
href="mailto:nsrca-discussion@lists.nsrca.org">General pattern
discussion</a> </div>
<div
style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>Sent:</b>
Friday, February 13, 2009 8:28 PM</div>
<div
style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>Subject:</b>
Re: [NSRCA-discussion] Receiver packs</div>
<div><br>
</div>
<div
style="font-size: 12pt; color: rgb(0, 0, 0); font-family: Arial;">Hi
Jerry,<br>
<br>
I have been using two li-po using the tech-aero double regulator <a
moz-do-not-send="true" href="http://www.tech-aero.net/plr5-dr2.htm">http://www.tech-aero.net/plr5-dr2.htm</a>
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.<br>
<br>
VB<br>
<br>
<br>
----- Original Message -----<br>
From: "Richard Strickland" <<a moz-do-not-send="true"
href="mailto:pamrich47@hotmail.com">pamrich47@hotmail.com</a>><br>
To: "General pattern discussion"
<a class="moz-txt-link-rfc2396E" href="mailto:nsrca-discussion@lists.nsrca.org"><nsrca-discussion@lists.nsrca.org></a><br>
Sent: Friday, February 13, 2009 8:01:03 PM GMT -06:00 US/Canada Central<br>
Subject: Re: [NSRCA-discussion] Receiver packs<br>
<br>
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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.<br>
RS<br>
<br>
> From: <a class="moz-txt-link-abbreviated" href="mailto:jjvoth@mtelco.net">jjvoth@mtelco.net</a><br>
> To: <a class="moz-txt-link-abbreviated" href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a><br>
> Date: Fri, 13 Feb 2009 17:32:25 -0600<br>
> Subject: Re: [NSRCA-discussion] Receiver packs<br>
> <br>
> Sorry, I said that wrong. I meant are two packs needed to power
the flight <br>
> pack.<br>
> ----- Original Message ----- <br>
> From: "Jerry Voth" <a class="moz-txt-link-rfc2396E" href="mailto:jjvoth@mtelco.net"><jjvoth@mtelco.net></a><br>
> To: "NSRCA" <a class="moz-txt-link-rfc2396E" href="mailto:nsrca-discussion@lists.nsrca.org"><nsrca-discussion@lists.nsrca.org></a><br>
> Sent: Friday, February 13, 2009 5:23 PM<br>
> Subject: [NSRCA-discussion] Receiver packs<br>
> <br>
> <br>
> > This has probably come up many times but I'd like to know if
it's <br>
> > necessary<br>
> > to use two Li-Fe packs for the radio and servos<br>
> > _______________________________________________<br>
> > NSRCA-discussion mailing list<br>
> > <a class="moz-txt-link-abbreviated" href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a><br>
> > <a class="moz-txt-link-freetext" href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a><br>
> ><br>
> <br>
> <br>
>
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