[NSRCA-discussion] Kavan starter with Li-Po battery
adriancwong at earthlink.net
adriancwong at earthlink.net
Fri Aug 22 12:42:04 AKDT 2008
Thanks to all the advice, I'll try a 3S 11.1V, 2100 mAh pack. Hopefully, it will have enough cranking power.
Adrian
-----Original Message-----
>From: Ed Alt <ed_alt at hotmail.com>
>Sent: Aug 22, 2008 1:54 PM
>To: jpavlick at idseng.com, General pattern discussion <nsrca-discussion at lists.nsrca.org>
>Subject: Re: [NSRCA-discussion] Kavan starter with Li-Po battery
>
> I'm using a 6S2100 LiPo setup with my HD Sullivan. The starter is rated at 12-24V and it handles the voltage just fine. I've also run it 4S2100 and it's more than adequate.
>
>Ed
> ----- Original Message -----
> From: John Pavlick
> To: General pattern discussion
> Sent: Friday, August 22, 2008 12:39 PM
> Subject: Re: [NSRCA-discussion] Kavan starter with Li-Po battery
>
>
> Ken,
> 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.
>
> John Pavlick
>
> Ken Velez <kvelez at comcast.net> wrote:
> 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.
>
> Ken
> ----- Original Message -----
> From: Robert Richards
> To: General pattern discussion
> Sent: Friday, August 22, 2008 11:31 AM
> Subject: Re: [NSRCA-discussion] Kavan starter with Li-Po battery
>
>
> Fully charged 4S lipo will be over 16v. Has anyone tried a 4S A123 pack? That would be 14v or less.
>
> Bob R.
>
>
> JShulman <jshulman at cfl.rr.com> wrote:
> 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
> 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
> trying to start the motor (setting and fine tuning), maybe.
>
> Regards,
> Jason
> www.jasonshulman.com
> www.shulmanaviation.com
> www.composite-arf.com
>
> -----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 3:26 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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