[NSRCA-discussion] Switch /replacement/reliability

Fri Jun 16 09:12:39 AKDT 2006

Here is another candidate for switch reliability.

One battery with two leads each to a switch, each lead from switch to RX.
If you can remember to turn on two switches (or mechanically tie both switches to a single
mechanical actuator) you get redundant switches and connectors to RX.
Zero additional single point failure items, not heavy or expensive. 

If you want to add battery redundancy; Two batts, each to it's own switch, each with
seperate cable and connector to RX.
You have to accept additional workload of checking both batteries often.

Later, Ron Lockhart

  ----- Original Message ----- 
  From: Wayne Galligan 
  To: NSRCA Mailing List 
  Sent: Friday, June 16, 2006 8:56 AM
  Subject: Re: [NSRCA-discussion] Voltageregulatormaintenance/replacement/reliability

  Chris,

  I have been using the MPI Miracle switch now for 5 yrs and 6 different planes with no failures of the electronics.  I have had two of them where the case has broken or the tab where the screw holds it has broken.  Maybe I tightened them too much.   I have concidered just using a H.D. Futaba switch and not using a regulator just to keep one more point of failure out of the equation.

  Wayne Galligan
    ----- Original Message ----- 
    From: White, Chris 
    To: NSRCA Mailing List 
    Sent: Friday, June 16, 2006 7:25 AM
    Subject: [NSRCA-discussion] Voltage regulatormaintenance/replacement/reliability

    I know when a regulator fails when using a li-on battery the results are catastrophic.   (lost one that way with a miracle switch)  How often should a voltage regulator be replaced?  Is one VR better than another?  Are there any checks which can be done to curtail disaster.

    At this point I prefer flying 5C non-regulated nimh or nicads..just to take the VR out of the loop.   I still have an airplane which has Li-on's and am thinking hard about how far I should push the regulator.   Airplane is probably 5-6 years old and equipment is probably original radio stuff.  I have 153 flights on it myself and don't know how many the previous owners put on it.  (The onboard Li-on is 2004 with the 153 flights..should it be replaced?)

    Your input is appreciated!

    Chris

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    From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of John Ferrell
    Sent: Thursday, June 15, 2006 4:48 PM
    To: NSRCA Mailing List
    Subject: Re: [NSRCA-discussion] JR and un-regulated 6V

    Three-terminal regulators dissipate the unused part of the power.

    My Prophecy takes about 135 mils per flight to recharge. There are a lot of factors that affect this number, especially airframe vibration.

    I keep an eye on it and am more worried about it being consistent rather than some value. 

    John Ferrell    W8CCW
    "My Competition is not my enemy"
    http://DixieNC.US

      ----- Original Message ----- 

      From: Wayne Galligan 

      To: NSRCA Mailing List 

      Sent: Thursday, June 15, 2006 10:21 AM

      Subject: Re: [NSRCA-discussion] JR and un-regulated 6V

      Does running a regulator, like a 5.1v-5.5v or 6.0v regulator, have any signifigant draw on the battery as it regulates the voltage?  I have been using the MPI Miracle switch that regulates to 6v.  I can get (4) 15 min flights on a 1650mil NiMh pack(Sanyo) before my ESC says to stop flying.

      I will put back about 700-750 mil on the recharge.

      Wayne Galligan 

        ----- Original Message ----- 

        From: White, Chris 

        To: NSRCA Mailing List 

        Sent: Thursday, June 15, 2006 7:54 AM

        Subject: Re: [NSRCA-discussion] JR and un-regulated 6V

        Hi Matt,

        Are you using low-impedence nimh packs?   Would you divulge your battery source?

        Thanks, Chris

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        From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of rcmaster199 at aol.com
        Sent: Wednesday, June 14, 2006 5:03 PM
        To: nsrca-discussion at lists.nsrca.org
        Subject: Re: [NSRCA-discussion] JR and un-regulated 6V

        I am doing that with NO problems. Fast charged on the way to field most of the time, with a Serius fast charger. In my set-up, a 1650ma NiMH lasts about 3 flights longer than a 4 cell pack of equivalent capacity. Equivalent ending cell voltages of 1.20v unloaded (1.15V loaded with 1000 ma draw) for either battery. 

        Getting greater torque and speed as well as longer flight time. Best all around

        MattK

        -----Original Message-----
        From: Gene Maurice <gene.maurice at comcast.net>
        To: 'NSRCA Mailing List' <nsrca-discussion at lists.nsrca.org>
        Sent: Wed, 14 Jun 2006 15:36:18 -0500
        Subject: [NSRCA-discussion] JR and un-regulated 6V

        Anyone aware of any issues running unregulated 6v Nimh pack with JR Digital

        servos??  

        Gene Maurice

        gene.maurice at comcast.net

        Plano, TX

        AMA 3408, NSRCA 877

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