<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
My 350 mah 2s battery with some velcro is 30 grams. A tech-aero
regulator with switch wired with a jst connector for the battery and
no charge cable weighs 25 grams. <br>
This is not the standard configuration but Ed will wire it this way
if you ask. I use a jst as most batteries in this size (250-500 mah
2s) come pre-wired with a jst connector, therefore no rewiring or
splices.<br>
<br>
John<br>
<br>
<br>
On 1/24/2012 10:48 AM, Wayne Galligan wrote:
<blockquote cite="mid:020BAD2AD2204ECFA816B854DA1E695B@WaynePC"
type="cite">
<style><!--
.hmmessage P
{
margin:0px;
padding:0px
}
body.hmmessage
{
font-size: 10pt;
font-family:Tahoma
}
--></style>
<div dir="ltr">
<div style="FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE:
12pt">
<div>How much does a redundant LiPo and regulator weight?</div>
<div>I guess I have been away from this stuff too long...
these electrons are heavy things.</div>
<div> </div>
<div style="FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE:
12pt">Wayne Galligan<br>
</div>
<div style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY:
'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT:
normal; TEXT-DECORATION: none">
<div style="FONT: 10pt tahoma">
<div> </div>
<div style="BACKGROUND: #f5f5f5">
<div style="font-color: black"><b>From:</b> <a
moz-do-not-send="true"
title="anthonyr105@hotmail.com"
href="mailto:anthonyr105@hotmail.com">Anthony Romano</a>
</div>
<div><b>Sent:</b> Tuesday, January 24, 2012 10:38 AM</div>
<div><b>To:</b> <a moz-do-not-send="true"
title="nsrca-discussion@lists.nsrca.org"
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>
</div>
<div><b>Subject:</b> Re: [NSRCA-discussion] Main battery
redundant lead for receiver</div>
</div>
</div>
<div> </div>
</div>
<div style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY:
'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT:
normal; TEXT-DECORATION: none">
<div dir="ltr">Because an 1100mah A123 is 39g for the cell
alone!<br>
<br>
Anthony<br>
<br>
<div>
<hr id="stopSpelling">
From: <a class="moz-txt-link-abbreviated" href="mailto:wcgalligan@att.net">wcgalligan@att.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: Tue, 24 Jan 2012 11:30:08 -0600<br>
Subject: Re: [NSRCA-discussion] Main battery redundant
lead for receiver<br>
<br>
<meta name="Generator" content="Microsoft SafeHTML">
<div dir="ltr">
<div style="FONT-FAMILY: 'Calibri'; COLOR: #000000;
FONT-SIZE: 12pt">
<div>After all this discussion about extra wire
connectors and regulators, etc., etc.
Interesting as it seems.</div>
<div>Why not use an 1100 mil A123 pack for the
receiver without the regulator.<em> </em>I
haven't weighed the difference but it couldn’t be
that much.</div>
<div>Sounds like your going for a lot extra work to
save a few “Grams”. </div>
<div> </div>
<div>Simplicity rules.</div>
<div> </div>
<div style="FONT-FAMILY: 'Calibri'; COLOR: #000000;
FONT-SIZE: 12pt">Wayne Galligan<br>
</div>
<div style="FONT-STYLE: normal; DISPLAY: inline;
FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE:
small; FONT-WEIGHT: normal; TEXT-DECORATION: none">
<div style="FONT: 10pt tahoma">
<div> </div>
<div style="BACKGROUND: #f5f5f5">
<div style="font-color: black"><b>From:</b> <a
moz-do-not-send="true"
title="khoard@gmail.com"
href="mailto:khoard@gmail.com">Keith Hoard</a>
</div>
<div><b>Sent:</b> Tuesday, January 24, 2012
10:01 AM</div>
<div><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><b>Subject:</b> Re: [NSRCA-discussion]
Main battery redundant lead for receiver</div>
</div>
</div>
<div> </div>
</div>
<div style="FONT-STYLE: normal; DISPLAY: inline;
FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE:
small; FONT-WEIGHT: normal; TEXT-DECORATION: none">Anthony,<br>
<br>
On a typical flight, I'm guessing the radio
only uses around 100-150Mah of power, while the
motor is using 4000Mah, so that's about 4% more
draw on those two cells. In practice, I haven't
been able to see any difference in the radio cells
when I hook them up to my charger at the end of a
flight. Sometimes cells #1 & #2 are the high
cells after a flight, so I think the power draw of
the radio is negligible to our motor packs.<br>
<br>
The problem with two regulators plugged into the
same 10S (or 5S) pack is that you are creating a
dead short between the cells thru the ground wires
(typically a straight wire thru the regulator). <br>
<br>
Say you plug Regulator #1 into cells #1&2, and
Regulator #2 into cells #6&7. The regulator's
<b><i>ground </i></b>wires now have 5 cells of
voltage potential (5 X 4.2V = 21Volts) between
them since they are plugged into cells # 1 and
#6. When those two ground wires are then plugged
into your receiver either thru a switch or direct
connection the magic smoke will escape and your
retailer will rejoice.<br>
<br>
Also, if you have both of your regulators plugged
into your motor pack and the packs eject like
Goose in Top Gun, you've lost both of your
redundant power sources. However, if you use a
tiny 2S LiPo that is physically separated and
secured inside your plane, you have both
electrical and physical redundancy. <br>
<br>
Hmmm, just thought of something . . . maybe we
should tie down the receiver so the main regulator
can't take the receiver out with it. . . so many
contingencies, so little weight . . .<br
clear="all">
<br>
Keith Hoard<br>
Collierville, TN<br>
<a moz-do-not-send="true"
href="mailto:khoard@gmail.com">khoard@gmail.com</a><br>
<br>
<br>
<br>
<br>
<div class="ecxgmail_quote">On Tue, Jan 24, 2012
at 8:15 AM, Anthony Romano <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:anthonyr105@hotmail.com">anthonyr105@hotmail.com</a>></span>
wrote:<br>
<blockquote style="BORDER-LEFT: #ccc 1px solid;
PADDING-LEFT: 1ex" class="ecxgmail_quote">
<div>
<div dir="ltr">Seems like a great idea but I
have two questions. Do the packs come down
out of balance since two cells are serving
extra load? Is there a problem with
parallel operation of two regulators?<br>
<br>
Thanks,<br>
<br>
Anthony<br>
<br>
<div>
<hr> From: <a moz-do-not-send="true"
href="mailto:joddino@socal.rr.com">joddino@socal.rr.com</a><br>
Date: Mon, 23 Jan 2012 15:25:00 -0800<br>
To: <a moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a><br>
Subject: Re: [NSRCA-discussion] Main
battery redundant lead for receiver<br>
<br>
I've been using this setup for sometime
and it is working great. I have my two
cell LiPo charged to 7.5 volts and it is
connected to a 6.0 volt regulator into
the receiver. The cable connected to
the balance connector on the "bottom" 5S
is connected to a 6.3 volt regulator so
it supplies all the current to the
system and the 2S pack never needs
charging. I'm using an 800 mAh pack but
it could be even smaller.
<div> </div>
<div>Jim O<br>
<div> </div>
<div>
<div> </div>
<div>
<div>On Jan 23, 2012, at 2:09 PM,
Scott McHarg wrote:</div>
<br>
<blockquote>Guys,<br>
Chris Moon just e-mailed me
about some leads that were done
at the factory. These leads run
off your balance leads to a
voltage regulator and allow your
main battery pack to be utilized
as a redundant receiver
battery. It is NOT meant to be
a primary but it will save 20+
grams if you're running 2 rx
batteries. You still have to
run the 2nd regulator for true
redundancy but you eliminate the
2nd battery. These leads are
factory made and eliminate the
need to make them yourself with
the concern about plugging in to
the wrong cell. I know in my
article, I was pretty much
against doing this as a backup
but, with Chris having this made
at the factory, he has all but
eliminated making a mistake by
tying to the wrong cell. I have
the link that I'll e-mail you
off-list or you can just go to
his website. I don't want to
break the NSRCA list rules by
advertising for him even though
he advertises with the NSRCA.
The leads are only $3.99 each
and are found under the
Connectors/Adapters listing.<br>
<br>
Thank,<br>
Scott<br clear="all">
<br>
-- <br>
<b style="COLOR: rgb(51,51,255)"><font
style="FONT-FAMILY: comic
sans ms,sans-serif" size="4">Scott
A. McHarg</font></b><br>
<br>
_______________________________________________<br>
NSRCA-discussion mailing list<br>
<a moz-do-not-send="true"
href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a><br>
<a moz-do-not-send="true"
href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion"
target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a></blockquote>
</div>
<div> </div>
</div>
</div>
<br>
_______________________________________________
NSRCA-discussion mailing list <a
moz-do-not-send="true"
href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a>
<a moz-do-not-send="true"
href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion"
target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a></div>
</div>
</div>
<br>
_______________________________________________<br>
NSRCA-discussion mailing list<br>
<a moz-do-not-send="true"
href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a><br>
<a moz-do-not-send="true"
href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion"
target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a><br>
</blockquote>
</div>
<br>
<hr>
_______________________________________________<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></div>
</div>
</div>
<br>
_______________________________________________
NSRCA-discussion mailing list
<a class="moz-txt-link-abbreviated" href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a>
<a class="moz-txt-link-freetext" href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a></div>
</div>
<p>
</p>
<hr>
_______________________________________________<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></div>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
NSRCA-discussion mailing list
<a class="moz-txt-link-abbreviated" href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a>
<a class="moz-txt-link-freetext" href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a></pre>
</blockquote>
</body>
</html>