[NSRCA-discussion] Kavan starter with Li-Po battery

[Michael Cohen]

Why the preference of Kavan (284 in-oz at 12 V) vs the Sullivan Hi-tork starter (210 in-oz at 12V) or the Sullivan Dynatron (340 in-oz at 12V or a lot more at 24V)?  I am asking since my Sullivan Hi-tork looks like it finally is done for after 20+ years of service starting everything up to the 160DZ.  I need to replace it soon.....

> From: don.ramsey at suddenlink.net> To: adriancwong at earthlink.net; nsrca-discussion at lists.nsrca.org> Date: Fri, 22 Aug 2008 08:36:25 -0500> Subject: [NSRCA-discussion] Kavan starter with Li-Po battery> > Adrian,> > I've had the windings of the armature break and stop the rotation. I did> once epoxy them back in place and it work for a while but soon failed. Did> you take the starter apart? If this is the problem it's easy to spot. I> couldn't find anyone who sold the armature as a part. Anyone know of a> source?> > BTW, the secret to reassembly is using 2 pins through the top of the started> to hold the brushes apart. Straight pins will work.> > Don> > -----Original Message-----> From: nsrca-discussion-bounces at lists.nsrca.org> [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of> adriancwong at earthlink.net> Sent: Friday, August 22, 2008 2:26 AM> To: NSRCA-discussion at lists.nsrca.org> Subject: [NSRCA-discussion] Kavan starter with Li-Po battery> > To all,> > 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 1400DZ came out, it> required more cranking power from the starter and one charge would normally> only last for two weekends of 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 you are aware, the 12 cell pack is really heavy.> > 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 pack. The first> starter lasted for 6 months until it stopped working after normal wear and> tear. The second one stopped working - frozen solid - after about 2 months -> I could tell this one had some strange noise to began with, like something> was rubbing inside. Therefore, I wasn't surprise that it stopped working> only after two months. > > The third starter I rigged up was relatively new, and has been working> perfectly, until this afternoon. After the first flight, it was frozen solid> again. Like the second starter, it didn't give any warning sign whatsoever -> slowing down, getting hot on either the starter or the battery.> > My question:-> > 1) Am I using the wrong battery pack? > > 2) Too high of a discharge rate because it's a li-po instead of ni-cd?> > 3) Once the starter is frozen, is there a way to fix it? Sure hate to keep> tossing away starters.> > > Any advice or suggestion from you electric gurus are greatly appreciated. > > Thanks in advance,> > Adrian> > > _______________________________________________> NSRCA-discussion mailing list> NSRCA-discussion at lists.nsrca.org> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion> > _______________________________________________> NSRCA-discussion mailing list> NSRCA-discussion at lists.nsrca.org> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
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