[NSRCA-discussion] Electricity to the on-board radio system

[Koenig, Tom]

Gentlemen,

Very good points, I must admit.

My set-up may interest some. I have been using a Kokam 2 cell, 1500maH Li-PO pack in my Synergy for over 12 months now ( same pack)-I'll check my logs for flts/cycles. Sofar so good.

I regularly jam about 1300-1400 mAh into it. It has held that for the last 10 months, so it seems that all is well and on par with what is expected. I do monitor it fairly closely and if there is degradation, I'll pull her out. I use the Schulze 6-330d as a charger, Version 8.??
I make my own regulator, using the micrel chip-but I mount a heatsink to it. I also use the big JR switch( which I modify) in conjunction with the regulator. The beauty of the JR switch is that it has a little window on there to DSC with. It makes a very tidy, regulator/switch set up without a million leads everywhere.

The pack is mounted in that Du-bro R/C foam and is velcro'd down. I also use the Deans mini connectors between pack and regulator input.
So far so good-touch wood...or should that be touch 'composite' <BG>

Tom
-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of brett terry
Sent: Tuesday, 14 February 2006 12:05 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Electricity to the on-board radio system


Eric,

make sure the battery pack is up to the current consumption your servos will dish out!  If you figure each digital servo can draw more than 3A, that is 18A out of the pack.  This is only momentary, but some of these smaller packs can be damaged but the high current spikes.  Maybe you want to try a couple of the packs in parallel?

Also, the Li-Poly packs are very vibration sensitive.  Make sure you shock-mount them!  And you probably don't want to use the MPI regulators unless you parallel them so they draw 3A max each, and have plenty of airflow.

Good luck!  I want to hear how that Cap flies.  It looks very nice.  What motor are you using?

Brett


On 2/13/06, Grow Pattern <  <mailto:pattern4u at comcast.net> pattern4u at comcast.net> wrote:

Triggered by the tease I wrote on the "Smoking li-Po" I remembered that way back I photographed Jason's Impact at the beginning of the National's. The FAI where he won.

In his plane I saw a small (900 mAh) Li-Poly that he was using to work the radio. I am/was not sure if the electric community were still doing this, or if they had passed on the tip.

I know that a separate battery has saved quite a few electric pattern panes already. You tend not to hear about the catastrophic motor/Li-Po failures from the sponsored guys. So for what it's worth here it is.

Also, I am running one of these 2-cell 7.4V packs in a six digital servo Great Planes 79" CAP 232. Still measuring the consumption.

The pack weighs 1.33 oz BTW

Regards,

Eric.

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