[NSRCA-discussion] Servo wire and battery questions

[John Ford]

Hi Mark,
  I am still debating that. The Integral's rudder is even fatter than the Olympian rudder, so it would be easier to do. Would save cost on the rudder servo, avoid the whole pull-pull system, and save weight and battery draw. I flew that setup for almost ten years and replaced servo gears only once.
   
  John

Mark Atwood <atwoodm at paragon-inc.com> wrote:
  Am I the only one on this list working very hard NOT to run with the “More than a friend” comment??? Lol...

My question is whether you plan to imbed your rudder servo in the rudder again!  That was cool...

-M


On 12/13/07 9:56 AM, "Gerald Gallagher" <ggall at bellsouth.net> wrote:

  John are you from the KC Mo. area & know Charlie Reed? IN fact I think you were more than a friend of Charlie's. 

 
Jerry Gallagher

 
  
 
-----Original Message-----
From:  nsrca-discussion-bounces at lists.nsrca.org  [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of John  Ford
Sent: Thursday, December 13, 2007 7:17 AM
To: NSRCA  Mailing List
Subject: Re: [NSRCA-discussion] Servo wire and battery  questions


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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