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

[vicenterc at comcast.net]

I am using the Sullivan Dynatron (the white one).  Using NiCads (12 cells).  It works great not only for me but also for others in the field when their starters don't work.  I am running a YS 160 DZ.  I will guess that should work for the YS 170.

--
Vicente "Vince" Bortone

-------------- Original message -------------- 
From: Michael Cohen <precisionaero at hotmail.com> 
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
> 
> 
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