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

[Jerry Stebbins]

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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