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

Sat Aug 23 05:31:32 AKDT 2008

I would try the new A123 cells (nano-phosphate) for this. Not quite as light as Lipo, but they can be abused without damage, charge quicker, and 4S will add up to between 13 and 14v fully charged.

  Bob R.

Dwayne Brown <dwaynenancy at suddenlink.net> wrote:
  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 
>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" 
>To: General pattern discussion ; General
pattern discussion 
>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 
>>Sent: Aug 22, 2008 1:54 PM
>>To: jpavlick at idseng.com, General pattern discussion

>>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 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 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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