Battery question

[Bob Pastorello]

Just a small observation - as has been noted recently by Eric H., if "something" goes awry, and you're forced to fly a "duration" flight, you need lots of battery reserve.  Like the hung throttle thing...lower throttle setting with a reasonable tank can force a 30 minute flight, easily.
    I have always chosen to carry more mah than I know that I'll need - ever - and don't mind the minor weight penalty.
    Flying 5 cells, I use a 1700mah NiMh.  On board battery doesn't show a loaded drop below 6 volts until after about 5 flights using 5 digitals servos on board my Petrel.  Usually, I can't focus enough to go more than 6 flights in a session...so it works for me.
    But, if still going on, I'll hook up the Sirius Field Charger and let it do it's work while I'm recovering between efforts...

Bob Pastorello, Oklahoma
NSRCA 199, AMA 46373
rcaerobob at cox.net
www.rcaerobats.net


  ----- Original Message ----- 
  From: Bob Kane 
  To: discussion at nsrca.org 
  Sent: Thursday, July 31, 2003 7:20 AM
  Subject: Re: Battery question


  # safe flights  = too many - one.  

  Seriously, I would check the voltage after each flight with voltmeter that puts a load on the pack. You own testing suggests you could fly three additional flights and still have a 380mAH reserve, assuming the flights are consistant in manuever content and duration. I would also cycle the pack to insure it delivers 1100mAH. 

  Terry Terrenoire <amad2terry at juno.com> wrote:
    Just flying my first ship with 4 digital servos. Power is supplied by a
    standard Nicad, 1100 mah, battery.
    After 3 flights the other day it took 361ma to refill it
    How mych reserve did I have ?
    Used an average of 120 ma per flight.
    How many flights can I SAFELY get on that 1100 mah pack?

    Terry T.
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  Bob Kane
  getterflash at yahoo.com


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