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

[adriancwong at earthlink.net]

I have to first find out how to open the Kavan, never done it before. With my clumsy hands I believe after it's opened, I won't be able to put it back together. Or, better yet, ended up with more parts than I first start with ... :-)

Adrian

-----Original Message-----
>From: Jerry Stebbins <JAStebbins at worldnet.att.net>
>Sent: Aug 23, 2008 7:49 AM
>To: General pattern discussion <nsrca-discussion at lists.nsrca.org>
>Subject: Re: [NSRCA-discussion] Kavan starter with Li-Po battery
>
>If you order new brushes from Hobby Lobby -they incude a special pin set to 
>hold the brushes open.
>I would take it apart and see if you can see nything obvious. I just 
>replaced the brushes on 4 of them , and each one was fine after the brushes 
>were replaced. I did have an armature winding break loose a long time 
>ago-sent it back and they sent me a new one with a fix in it.
>Jerry
>----- Original Message ----- 
>From: "Don Ramsey" <don.ramsey at suddenlink.net>
>To: <adriancwong at earthlink.net>; "'General pattern discussion'" 
><nsrca-discussion at lists.nsrca.org>
>Sent: Friday, August 22, 2008 8:36 AM
>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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