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

Fri Aug 22 12:56:03 AKDT 2008

What drove me to li-po in the first place was the lighter weight

-----Original Message-----
>From: Bob Kane <getterflash at yahoo.com>
>Sent: Aug 22, 2008 4:49 PM
>To: nsrca-discussion at lists.nsrca.org
>Subject: Re: [NSRCA-discussion] Kavan starter with Li-Po battery
>
>FWIW, my 10 cell sub-C nicad powered Kavan started has no trouble starting up to 170DZ engines.
>
>Bob Kane
>getterflash at yahoo.com
>
>
>
>----- Original Message ----
>From: "adriancwong at earthlink.net" <adriancwong at earthlink.net>
>To: General pattern discussion <nsrca-discussion at lists.nsrca.org>; General pattern discussion <nsrca-discussion at lists.nsrca.org>
>Sent: Friday, August 22, 2008 4:41:57 PM
>Subject: Re: [NSRCA-discussion] Kavan starter with Li-Po battery
>
>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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