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<DIV><EM>I use Thunder Power Lipo 2 cell 350 mAh for reciever
packs.</EM></DIV>
<DIV><EM></EM> </DIV>
<DIV><EM>Matt</EM></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=joddino@socal.rr.com href="mailto:joddino@socal.rr.com">James
Oddino</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">General pattern discussion</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, February 14, 2009 3:55
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Receiver
packs</DIV>
<DIV><BR></DIV>I'll second that. I see a bunch of folks that are not
near as knowledgeable as pattern folk flying all kinds of aircraft and they
don't seem to have problems with LiPos. I believe the loss of planes due
to NiCds and NiMHs was/is a lot higher than those lost to Lithiums (excluding
those early Duralites).
<DIV><BR></DIV>
<DIV>Jim O</DIV>
<DIV><BR></DIV>
<DIV><BR>
<DIV>
<DIV>On Feb 14, 2009, at 1:26 PM, Ed Alt wrote:</DIV><BR
class=Apple-interchange-newline>
<BLOCKQUOTE type="cite"><SPAN class=Apple-style-span
style="WORD-SPACING: 0px; FONT: 18px Helvetica; TEXT-TRANSFORM: none; COLOR: rgb(0,0,0); TEXT-INDENT: 0px; WHITE-SPACE: normal; LETTER-SPACING: normal; BORDER-COLLAPSE: separate; orphans: 2; widows: 2; webkit-border-horizontal-spacing: 0px; webkit-border-vertical-spacing: 0px; webkit-text-decorations-in-effect: none; webkit-text-size-adjust: auto; webkit-text-stroke-width: 0">
<DIV class=hmmessage style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana"
bgcolor="#ffffff">
<DIV><FONT face=Arial>Jerry:</FONT></DIV>
<DIV><FONT face=Arial>Using A123 batteries requires extra vigilance, since
they have a very flat discharge curve for most of their capacity (after an
initial quick drop), right up to the point where you have little usable
capacity left. As a result, you won't be able to gauge remaining
capacity with a meter, although you can estimate it once you can experience
with typical discharge characteristics. As long as everything with
your servo current drain remains consistent and healthy, you can pick a
reasonable quitting point after X flights. I'm not sure what the
appeal of these batteries is for a flight pack application. One drawback is
that you run the servos at a fairly high voltage, which might damage some
servos. If you add regulators, that problem is
alleviated, but overall you have a heavier solution than with a LiPo
set. Enhanced charging safety is really all that you are
buying. </FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>I think the thing that should be realized is that a
set of 2 cell 480 or 730 mAh LiPo's have an extraordinarily easy life when
all they are doing is powering a flight pack. You can get many more
cycles out of then than NiCad or NiMH packs and they have much better end of
life performance. I just don't see what the concern is.</FONT></DIV>
<DIV> </DIV>
<DIV>Ed</DIV>
<DIV> </DIV>
<DIV>----- Original Message -----</DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(0,0,0) 2px solid; MARGIN-RIGHT: 0px">
<DIV
style="FONT: 10pt arial; BACKGROUND-COLOR: rgb(228,228,228); webkit-background-clip: initial; webkit-background-origin: initial"><B>From:</B><SPAN
class=Apple-converted-space> </SPAN><A title=jjvoth@mtelco.net
href="mailto:jjvoth@mtelco.net">Jerry Voth</A></DIV>
<DIV style="FONT: 10pt arial"><B>To:</B><SPAN
class=Apple-converted-space> </SPAN><A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">General pattern
discussion</A></DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B><SPAN
class=Apple-converted-space> </SPAN>Saturday, February 14, 2009 4:11
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B><SPAN
class=Apple-converted-space> </SPAN>Re: [NSRCA-discussion] Receiver
packs</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial>Richard,</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>I was thinking more about using A-123 batteries.
They're supposed to be safer. My memory is what scares me about
Lipos.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Also, what would the effect be on an ESC using A-123
batteries in place of Lipos? I've read there are some issues.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Jerry</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(0,0,0) 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message -----</DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND-COLOR: rgb(228,228,228); webkit-background-clip: initial; webkit-background-origin: initial"><B>From:</B><SPAN
class=Apple-converted-space> </SPAN><A title=pamrich47@hotmail.com
href="mailto:pamrich47@hotmail.com">Richard Strickland</A></DIV>
<DIV style="FONT: 10pt arial"><B>To:</B><SPAN
class=Apple-converted-space> </SPAN><A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">General pattern
discussion</A></DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B><SPAN
class=Apple-converted-space> </SPAN>Saturday, February 14, 2009
12:37 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B><SPAN
class=Apple-converted-space> </SPAN>Re: [NSRCA-discussion] Receiver
packs</DIV>
<DIV><BR></DIV>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.<SPAN class=Apple-converted-space> </SPAN><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>
<HR id=stopSpelling>
From:<SPAN class=Apple-converted-space> </SPAN><A
href="mailto:jjvoth@mtelco.net">jjvoth@mtelco.net</A><BR>To:<SPAN
class=Apple-converted-space> </SPAN><A
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>
<DIV><FONT face=Arial size=2>Thanks for the info guys</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(0,0,0) 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message -----</DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND-COLOR: rgb(228,228,228); webkit-background-clip: initial; webkit-background-origin: initial"><B>From:</B><SPAN
class=Apple-converted-space> </SPAN><A
title=vicenterc@comcast.net
href="mailto:vicenterc@comcast.net">Vicente "Vince" Bortone</A></DIV>
<DIV style="FONT: 10pt arial"><B>To:</B><SPAN
class=Apple-converted-space> </SPAN><A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">General pattern
discussion</A></DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B><SPAN
class=Apple-converted-space> </SPAN>Friday, February 13, 2009
8:28 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B><SPAN
class=Apple-converted-space> </SPAN>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<SPAN
class=Apple-converted-space> </SPAN><A
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
href="mailto:pamrich47@hotmail.com">pamrich47@hotmail.com</A>><BR>To:
"General pattern discussion" <<A
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>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:<SPAN
class=Apple-converted-space> </SPAN><A
href="mailto:jjvoth@mtelco.net">jjvoth@mtelco.net</A><BR>> To:<SPAN
class=Apple-converted-space> </SPAN><A
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>><SPAN
class=Apple-converted-space> </SPAN><BR>> Sorry, I said that
wrong. I meant are two packs needed to power the flight<SPAN
class=Apple-converted-space> </SPAN><BR>> pack.<BR>> -----
Original Message -----<SPAN
class=Apple-converted-space> </SPAN><BR>> From: "Jerry Voth"
<<A
href="mailto:jjvoth@mtelco.net">jjvoth@mtelco.net</A>><BR>> To:
"NSRCA" <<A
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>><SPAN
class=Apple-converted-space> </SPAN><BR>><SPAN
class=Apple-converted-space> </SPAN><BR>> > This has
probably come up many times but I'd like to know if it's<SPAN
class=Apple-converted-space> </SPAN><BR>> >
necessary<BR>> > to use two Li-Fe packs for the radio and
servos<BR>> >
_______________________________________________<BR>> >
NSRCA-discussion mailing list<BR>> ><SPAN
class=Apple-converted-space> </SPAN><A
href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</A><BR>>
><SPAN class=Apple-converted-space> </SPAN><A
href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</A><BR>>
><BR>><SPAN
class=Apple-converted-space> </SPAN><BR>><SPAN
class=Apple-converted-space> </SPAN><BR>>
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