<div>Ken,</div> <div> THAT is the secret Ken. Good batteries are capable of delivering a higher voltage under a high current loading. If the starter is designed to run on 12V you're pushing your luck with anything much over 14V. That's why things are breaking. A GOOD 3S pack should be more than adequate.</div> <div> </div> <div>John Pavlick<BR><BR><B><I>Ken Velez <kvelez@comcast.net></I></B> wrote:</div> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid"> <META content="MSHTML 6.00.6000.16674" name=GENERATOR> <STYLE></STYLE> <DIV><FONT face=Arial size=2>I have a question about all this. I see people using 2S 7.4 @ 8.4V charged and a 4S @ 16.8 V charged. I'm using a 1950 mAh 3S Extreme V2 on mine and although I'm flying Pattern electric mostly I still have other glow set ups including a YS 1.60 and my starter has no issues starting any of this and while using the 3S doesn't give
you any advantage as power increase compeered to the 14.4 Ni-Cad packs available the Li-Po's hold a higher voltage under load without stressing the motor and components. Just my thoughts.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Ken</FONT></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=bob@toprudder.com href="mailto:bob@toprudder.com">Robert Richards</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> Friday, August 22, 2008 11:31 AM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re:
[NSRCA-discussion] Kavan starter with Li-Po battery</DIV> <DIV><BR></DIV> <DIV>Fully charged 4S lipo will be over 16v. Has anyone tried a 4S A123 pack? That would be 14v or less.</DIV> <DIV> </DIV> <DIV>Bob R.</DIV> <DIV><BR><BR><B><I>JShulman <<A href="mailto:jshulman@cfl.rr.com">jshulman@cfl.rr.com</A>></I></B> wrote:</DIV> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">I had the same thing happen to mine with a 4S set-up. The first warning sign was the starter had gotten really hot. The second, and<BR>final sign, was the starter locked-up. I think it's a combination of the higher voltage and, for me, the longer time running it<BR>trying to start the motor (setting and fine tuning), maybe.<BR><BR>Regards,<BR>Jason<BR>www.jasonshulman.com<BR>www.shulmanaviation.com<BR>www.composite-arf.com<BR><BR>-----Original Message-----<BR>From: nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org]On Behalf Of<BR>adriancwong@earthlink.net<BR>Sent: Friday, August 22, 2008 3:26 AM<BR>To: NSRCA-discussion@lists.nsrca.org<BR>Subject: [NSRCA-discussion] Kavan starter with Li-Po battery<BR><BR><BR>To all,<BR><BR>I have been using a Kavan starter with a 10 cell, 12V, 2.2A ni-cd pack for many years with good results. However, ever since the<BR>1400DZ came out, it required more cranking power from the starter and one charge would normally only last for two weekends of<BR>flying. By the time the 160Z came along, I've switched to a 12 cell, 14.4V, 2.2A ni-cd. Again, it performs flawlessly. However, as<BR>you are aware, the 12 cell pack is really heavy.<BR><BR>At the beginning of this year, I have switched to two li-po packs - 2 cell, 7.4V, 2100 mAh with 15C continuous, 20C burst on each<BR>pack. The first starter lasted for 6 months until it stopped working after normal wear and tear. The second one stopped working -<BR>frozen
solid - after about 2 months - I could tell this one had some strange noise to began with, like something was rubbing inside.<BR>Therefore, I wasn't surprise that it stopped working only after two months.<BR><BR>The third starter I rigged up was relatively new, and has been working perfectly, until this afternoon. After the first flight, it<BR>was frozen solid again. Like the second starter, it didn't give any warning sign whatsoever - slowing down, getting hot on either<BR>the starter or the battery.<BR><BR>My question:-<BR><BR>1) Am I using the wrong battery pack?<BR><BR>2) Too high of a discharge rate because it's a li-po instead of ni-cd?<BR><BR>3) Once the starter is frozen, is there a way to fix it? Sure hate to keep tossing away starters.<BR><BR><BR>Any advice or suggestion from you electric gurus are greatly appreciated.<BR><BR>Thanks in advance,<BR><BR>Adrian<BR><BR><BR>_______________________________________________<BR>NSRCA-discussion mailing
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