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<DIV><FONT size=2>There's a "trap" in using a LiPo and regulator in that
they work so well... <STRONG>right up until the LiPo voltage drops below the
regulator cut-out</STRONG>. (where it just passes the full LiPo voltage to the
RX) At that point you might have 1 min left... The LiPo will be below safe
minimum voltage (damaging the LiPo) and when the throttle falesafe indicates the
RX is getting less than 3.8 volts... you are about 10 seconds from total loss of
control.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Use of 3S LiPo in a TX that has a low voltage alarm can be a
similar trap... The alarm won't sound until the LiPo is ready to drop to 0
volts. (except the Futaba MZ's which are designed to use LiPo and should have an
appropriate alarm setting)</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>I have read of a few incidents of people thinking they were OK
for another flight or two, and the LiPos dumping. You have to check the
LIPO voltage before each flight, and you have to know what those voltages mean
in relation to remaining capacity.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>The incidents I have read about were ALL due to lack of
charging and lack of checking remaining capacity (or failure to understand that
9.6 V on the TX voltage indicator is NOT GOOD when using 3S LiPo) I have
not heard reports of the regulators failing. Just operator errors.
(failure to recharge)</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=cchariandy@yahoo.ca href="mailto:cchariandy@yahoo.ca">colin
chariandy</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, January 03, 2007 9:06
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] LiPO
Receiver packs</DIV>
<DIV><BR></DIV>
<DIV>Thanks Jason. </DIV>
<DIV> </DIV>
<DIV>What about reliablity? How do these batteries fail? Is it detectable
before it's too late?</DIV>
<DIV> </DIV>
<DIV>Is there a not too expensive charger ( not the 10101) that can be used to
minitor the LiPO condition?</DIV>
<DIV> </DIV>
<DIV>I have been using SR batteries forever and I have learned how these
batteries fail. As a result it's easy to avoid the failure in the air. How do
you plan to ensure that the LiPOs don't fail in the plane?</DIV>
<DIV> </DIV>
<DIV>Colin.<BR><BR><B><I>JShulman <jshulman@cfl.rr.com></I></B>
wrote:</DIV>
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<DIV><SPAN class=060415502-04012007><FONT face=Arial color=#0000ff>With my
new Integral with the OS-200/YS-160, I am running a TP-910 2-cell lipo with
a Shulman Aviation 6V regulator. After 3 flights, I put in 380 mah's. I
would imagine on a 2C it might be a bit better.</FONT></SPAN></DIV>
<DIV><FONT face=Arial color=#0000ff></FONT> </DIV>
<DIV><FONT
size=2>Regards,<BR>Jason<BR>www.jasonshulman.com<BR>www.shulmanaviation.com<BR>www.composite-arf.com</FONT>
</DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org]<B>On Behalf Of </B>colin
chariandy<BR><B>Sent:</B> Wednesday, January 03, 2007 9:51
PM<BR><B>To:</B> NSRCA Mailing List<BR><B>Subject:</B> [NSRCA-discussion]
LiPO Reciever packs<BR><BR></FONT></DIV>
<DIV>Hi all</DIV>
<DIV> </DIV>
<DIV>Just trying to get some background on the use of LiPOs for reciever
packs.</DIV>
<DIV> </DIV>
<DIV>What are you guys using...2 cell, 3 cells?</DIV>
<DIV> </DIV>
<DIV>Which regulators do you recommend? </DIV>
<DIV> </DIV>
<DIV>How do you monitor performance? </DIV>
<DIV> </DIV>
<DIV>How reliable are they in a 2C airplane?</DIV>
<DIV> </DIV>
<DIV>Appreciate any advice.</DIV>
<DIV> </DIV>
<DIV>Thanks</DIV>
<DIV>Colin.</DIV>
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