[NSRCA-discussion] Kavan starter with Li-Po battery
adriancwong at earthlink.net
adriancwong at earthlink.net
Fri Aug 22 17:21:43 AKDT 2008
One charge will usually last for a month and a half with flying every weekend.
I soldered a male and female Astro zero loss connector between the li-o pack and the starter, and I always disconnect the two after each flying session. Therefore, the only way they will catch fire is while I'm at the field during start-up.
-----Original Message-----
>From: Lisa & Larry <lld613 at psci.net>
>Sent: Aug 22, 2008 7:08 PM
>To: 'General pattern discussion' <nsrca-discussion at lists.nsrca.org>
>Subject: Re: [NSRCA-discussion] Kavan starter with Li-Po battery
>
>One thing to keep in mind...I recently checked my Kavan Starter as it
>hesitated and I thought the brushes were going south. What I found is that
>the power cables were shorting together after being worn through from years
>of use. I've only used the standard NiCd pack...
>
>I shutter to think what might have happened if I were using a LiPo...
>
>Food for thought...You may want to check the wiring frequently and
>addressing a prevention method if you consider LiPo batteries...
>
>Larry Diamond
>
>-----Original Message-----
>From: nsrca-discussion-bounces at lists.nsrca.org
>[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Dwayne Brown
>Sent: Friday, August 22, 2008 5:45 PM
>To: adriancwong at earthlink.net; 'General pattern discussion'
>Subject: Re: [NSRCA-discussion] Kavan starter with Li-Po battery
>
>What makes me want any Lithium battery is I don't have to charge it the
>night before if I've charged it last week. Dwayne
>
>-----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 3:56 PM
>To: General pattern discussion; nsrca-discussion at lists.nsrca.org
>Subject: Re: [NSRCA-discussion] Kavan starter with Li-Po battery
>
>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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