Battery question

[Tony Stillman]

Wayne:

The difference is in the power available to the servo, right off of center.  Std. type servos must have a large input change signal (lots of stick movement) to reach 100% of their rated torque.  The digitals give it all right away.  That leads to tighter control, but the down side is the high draw, especially on high-vibration models.  A soft engine mount will help a lot, but you really need to keep an eye on any new model that has digitals in it.  You need to check each flight until you develop a "feel" for the current draw.  As other stated, you time the flights, then discharge and see what you used.  I know of some top pattern pilots that use upwards of 500 mah in a single flight!  I use about 130 mah/flight.  Lots of things contribute to this, so you HAVE to check it out, or it WILL bite you....

Tony Stillman
Radio South
3702 N. Pace Blvd.
Pensacola, FL 32505
1-800-962-7802
www.radiosouthrc.com
  ----- Original Message ----- 
  From: Wayne Galligan 
  To: discussion at nsrca.org 
  Sent: Thursday, July 31, 2003 12:26 PM
  Subject: Re: Battery question


   Tony,

  Wouldn't that say something for the good ole std coreless servo then.  Does one REALLY need a digital for top performance?  I have coreless on my Prophecy and digitals on the Aries.    I can knife edge all day long on the coreless just like my digital.  My Futaba coreless 9101/9202 servos center well and probably as good as my JR digitals.  So where or when do I realize the difference?   

  Wayne G.
    ----- Original Message ----- 
    From: Tony Stillman 
    To: discussion at nsrca.org 
    Sent: Thursday, July 31, 2003 11:02 AM
    Subject: Re: Battery question


    Joe:

    That's because the control surfaces are bouncing up and down, and your
    high-current Digital servos are fighting to hold them in place.

    That is the advantage of using a soft engine mount.  It reduces the load on
    the servos by reducing the vibration transmitted to the controls, especially
    during low engine power settings.  Merle Hyde actually says you will see a
    300 % increase in battery performance using his mount!

    Tony Stillman
    Radio South
    3702 N. Pace Blvd.
    Pensacola, FL 32505
    1-800-962-7802
    www.radiosouthrc.com
    ----- Original Message ----- 
    From: "Joe Dunnaway" <dunnaway at geopath.com>
    To: <discussion at nsrca.org>
    Sent: Thursday, July 31, 2003 10:50 AM
    Subject: Re: Battery question


    > Hi Terry,
    >  I put one of those cheap Hobbico "VoltWatch" LED displays in my plane.  I
    > have 4 digital servos and during the 3rd flight, the display will show in
    > the green with the engine off but is bumping the red with the engine
    > running. I'm running a 1600 mah 4 cell Nihm pack. It's amaziing how much
    > current these digital servos are drawing just to stay centered with the
    > motor is running.
    >
    > Joe Dunnaway
    >
    > .
    >
    > ----- Original Message ----- 
    > From: "Terry Terrenoire" <amad2terry at juno.com>
    > To: <discussion at nsrca.org>
    > Sent: Thursday, July 31, 2003 9:47 AM
    > Subject: Re: Battery question
    >
    >
    > > That is the "technical" info I was looking for.
    > > Seems that 3 flights is very safe and will provide a reserve. I can
    > > recharge to fulll capacity with my Super Nova in 2 hours.
    > >
    > > Terry T.
    > >
    > > On Thu, 31 Jul 2003 09:09:12 -0500 VicenteRC <vicenterc at comcast.net>
    > > writes:
    > > > Hi Terry:
    > > >
    > > > I use the same pack and I can fly 4-5 times (2 Advance Schedules
    > > > each
    > > > fly) and never had a problem.  The rule of thumb is not to go far
    > > > below
    > > > 1/2 of the pack capacity.  In this case we don't want to use a lot
    > > > more
    > > > than 550 mah.
    > > >
    > > > Regards,
    > > >
    > > > Vicente Bortone
    > > >
    > > >
    > > >
    > > > ----- Original Message -----
    > > > From: Terry Terrenoire <amad2terry at juno.com>
    > > > Date: Thursday, July 31, 2003 5:22 am
    > > > Subject: Battery question
    > > >
    > > > > 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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    >
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