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 Post subject: Castle magic smoke / mini servos
PostPosted: Sun Aug 25, 2013 5:49 pm 
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Joined: Tue Dec 18, 2012 1:31 pm
Posts: 268
Well... I let the magic smoke out of my Talon 90 ESC today. I've always had good luck with CC. Today was a major bummer... not because of the Talon 90 (which is relatively inexpensive)... but because it took out $300 worth of MKS mini servos when it blew up.

Anybody know a good mini servo for my E6-550? I was running MKS DS9660A+. The Spektrum A5040 specs look good and it's only $28 - but they repeatedly label it an "aircraft" servo for some reason.


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 Post subject: Re: Castle magic smoke / mini servos
PostPosted: Sun Aug 25, 2013 6:06 pm 
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Joined: Thu Aug 25, 2011 9:14 pm
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Location: Bryan, TX
Would this work?

http://www.spektrumrc.com/Products/Defa ... =SPMSH5010

What do you think of the E6-550?

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 Post subject: Re: Castle magic smoke / mini servos
PostPosted: Sun Aug 25, 2013 7:01 pm 
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Joined: Sat Aug 13, 2011 5:35 pm
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Location: Northern Michigan
Just be careful because (you probably already know this but it never hurts to mention it) the cyclic mechanism in the E6-550 is set up for JR splines. They make a conversion kit for Futaba splines but I am not sure of the availability. Just hate to see you go get new servos only to discover they won't work.

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 Post subject: Re: Castle magic smoke / mini servos
PostPosted: Sun Aug 25, 2013 8:54 pm 
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Location: Austin, TX
I believe most of the Spektrum-branded Savox servos are using the JR spline, whereas the Align-branded Savox use Futaba.

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 Post subject: Re: Castle magic smoke / mini servos
PostPosted: Sun Aug 25, 2013 9:27 pm 
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JustPlaneChris wrote:
I believe most of the Spektrum-branded Savox servos are using the JR spline, whereas the Align-branded Savox use Futaba.


I have found that the German Savox web site to be a good source of technical info on Savox servos, including their splines.


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 Post subject: Re: Castle magic smoke / mini servos
PostPosted: Mon Aug 26, 2013 4:20 am 
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Thanks for the comments. I am aware of the spline issue - I had to order the Futaba tubes for the MKS servos. The lady at the hobby store looked puzzled when I was checking out with my JR branded part labelled "Futaba type".

I'm still kicking myself for using that Talon 90. I was trying to save money and weight by integrating a 20A BEC into the ESC. Boy did that backfire. From now on I'm going for redundancy with a separate RX batt or BEC+backup guard.

I guess I'll replace it with a Hobbywing Platinum 100A. Although I should be pissed at CC... the Edge 100 still looks attractive to me because of the data logging. Is there an alternative with logging?


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 Post subject: Re: Castle magic smoke / mini servos
PostPosted: Sun Sep 01, 2013 5:25 am 
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I made a mention on the show! Of course it was a public service announcement... :roll:

Anyway, you guys have me seriously considering LiFe RX packs. I have some questions:

1) Are HV servos required? Or are you running 6.6V raw battery into servos rated for 6.0V?

2) Do the LiFe packs need to be "storage charged" Or can you store them fully charged without damage?

Thanks!

-Jon Vogel
(in case I'm on the show again for blowing something else up - ha)


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 Post subject: Re: Castle magic smoke / mini servos
PostPosted: Sun Sep 01, 2013 7:16 am 
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Location: Austin, TX
Jon, I've never had an issue running LiFe packs on servos rated for 6v. I do run regulators on those rated for 4.8v only, though, like tail servos.

I charge the pack the night before and leave it at whatever voltage it ends up at. They don't seem to mind being left at full charge.

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 Post subject: Re: Castle magic smoke / mini servos
PostPosted: Sun Sep 01, 2013 1:11 pm 
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jv8 wrote:
Anyway, you guys have me seriously considering LiFe RX packs. I have some questions:

1) Are HV servos required? Or are you running 6.6V raw battery into servos rated for 6.0V?

2) Do the LiFe packs need to be "storage charged" Or can you store them fully charged without damage?


I also use a 2S LiFe Rx battery with 6vdc servos works great.

A LiFe battery has an initial voltage drop from 100% charged, then has an extremely flat discharge curve; so don't worry about a storage charge one bit with LiFe batteries.

Here is the discharge curve that my Cellpro 8 produced:

100% 3.649vdc/cell
90% 3.391vdc/cell
80% 3.374vdc/cell
70% 3.354vdc/cell
60% 3.341vdc/cell
50% 3.335vdc/cell
40% 3.333vdc/cell
30% 3.323vdc/cell
20% 3.292vdc/cell
10% 3.247vdc/cell
0% 3.045vdc/cell


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