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

[Grow Pattern]

Brett,
         I have flown the CAP 232 already, thanks to some super January weather in NJ. I have a series of posts on RCU.
http://www.rcuniverse.com/forum/m_3707956/mpage_1/key_/tm.htm

I put meters between the battery and the servos. I never saw much over 500 ma even when I loaded up multiple servos. The battery used up about 40% of its "safe" capacity in three flights. I'm looking at the 2100 mAh packs.

I heat sink my regulators.

Regards,

Eric.


  ----- Original Message -----  
  From: brett terry 
  To: NSRCA Mailing List 
  Sent: Monday, February 13, 2006 8:05 PM
  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 < 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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