[NSRCA-discussion] Servo wire and battery questions

[John Ford]

Ed, Troy, Emory,
   
  Thanks very much for your help. I will go in that direction.
  Ed, I will look for your website, and discuss the reduncdant regulator off-line.
   
  Regards,
   
  John
  

Ed Alt <ed_alt at hotmail.com> wrote:
                John:
  You should not need any kind of signal buffer.  The main problem with long leads is excessive voltage drop due to higher resistance if the wire gauge is too light.  Just use 22AWG and also avoid any tin plated connectors and you should be fine. Braided wire can be helpful, but isn’t really necessary most of the time.  
   
  Re. the use of either Lithium Ion or Lithium Polymer batteries, yes, you need a regulator.  The Jaccio works really well.  I also make regulators that are adjustable and fill a niche if you have a need for redundant batteries and want some additional flexibility in the setup.  Either solution can work.  And you are correct that a 480 mAh pack isn’t a lot of capacity, however with a good LiPo, there ability to deliver current on demand is more than adequate.  Capacity for some number of flights is the bigger question.  
   
  The electric powered pattern models use a very small amount of current in flight because of the virtual elimination of vibration from the power plant, so you will see guys going all weekend with a pair of 2S480 packs.  I still fly glow and use a pair of 730mAh packs.
   
  Ed
   
  -----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of John Ford
Sent: Wednesday, December 12, 2007 11:10 PM
To: NSRCA Mailing List
Subject: [NSRCA-discussion] Servo wire and battery questions
   
    Hi all,

    Return-to-pattern after a long time questions...

     

    Question #1

    I used to use JR servo amplifiers on servos to eliminate noise and ensure strong signal over a long servo lead, especially to the back of the plane. Few of these, if any, are available commercially now, so I assume that there is little need for them any more? (Was never convinced they served a purpose to begin with, but I had never built a plane without them, and never had a problem)

    I will be using JR 955 RX and digital servos. 

    Maybe as simple an answer as "never an issue, regardless of servo wire length".

    Maybe I should twist my wires?

     

    Question #2

    I used to use nothing other than large SR nicads for the flight pack, usually 1100mAh.

    I notice that folks are now using Thunder Power Li-Po batteries, some as small as 480mAh, and several around 800mAh.  Doesn't seem to be much capacity to run six digitals.

    I assume there is a Jaccio regulator to cut it down to 5V or so. Are Li-Pos reliable enough that only one cell is used, or are some folks using a SmartFly dual battery regulator that ignores one battery if it should fail?

     

    I appreciate any calibration on what the "standard" setup might be. 

     

    Thanks,

     

    John

     

     

     

    
    
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