[NSRCA-discussion] Arming device

[Del R]

The nice thing about being brought up around GUNS.. It teaches people to respect it always as though it is loaded and cocked ready to deliver its physical life altering energy!!!.. < tic > 
 

  ----- Original Message ----- 
  From: David Cook via NSRCA-discussion 
  To: Jim Woodward ; General pattern discussion 
  Sent: Saturday, May 16, 2015 10:48 AM
  Subject: Re: [NSRCA-discussion] Arming device


  Just to open the can of worms from the other end.
  Now that I have seen the damage a runaway can do to a pool table even with an external arming device, I have begun to make it a common practice to remove the prop from the electric planes any time I am not at the field flying. Store the ammunition and the pin under two different locks. How easy is it to be careless in the shop or transporting a plane. This thread could just explode with stories of mishaps we have made or come way too close to. 
  You just can't be too carful with these things!!!
  DC


  On Sat, May 16, 2015 at 10:21 AM, Jim Woodward via NSRCA-discussion <nsrca-discussion at lists.nsrca.org> wrote:

    ... Going electric induces a mental physchosis that requires everyone else to switch, then go and change the rules for glow :) 

    Sent from my iPhone

    On May 16, 2015, at 9:38 AM, Keith Hoard via NSRCA-discussion <nsrca-discussion at lists.nsrca.org> wrote:


      I think the YS guys should have their caller remove the fuel tank and glow plug before picking up the plane and exiting the runway  . . .



      From: NSRCA-discussion [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of precisionaero via NSRCA-discussion
      Sent: Saturday, May 16, 2015 8:38 AM
      To: General pattern discussion
      Subject: Re: [NSRCA-discussion] Arming device



      I think we should reconfigure a YS engine to drive a generator to supply electricity to the electric motor.





      Sent via the Samsung Galaxy S™ III, an AT&T 4G LTE smartphone



      -------- Original message --------

      From: Peter Vogel via NSRCA-discussion 

      Date:05/16/2015 09:31 (GMT-05:00) 

      To: General pattern discussion , ronlock at comcast.net, David 

      Subject: Re: [NSRCA-discussion] Arming device 



      I think we're all in agreement, which is why the rules proposal we put forth requires a *physical* break in the circuit!

      Sent from Outlook







      On Sat, May 16, 2015 at 6:16 AM -0700, "ronlock--- via NSRCA-discussion" <nsrca-discussion at lists.nsrca.org> wrote:

        I'm in agreement.

        Ron Lockhart




------------------------------------------------------------------------

        From: "David via NSRCA-discussion" <nsrca-discussion at lists.nsrca.org>
        To: nsrca-discussion at lists.nsrca.org
        Sent: Saturday, May 16, 2015 1:14:21 AM
        Subject: [NSRCA-discussion] Arming device



        I'm not trying to bring up a sore subject but this has been bugging me since it was up a while back. I am the senior electronics technician in the plasma physics department at the University of Wisconsin. About a third of what I do is make interlock circuits for the Madison Symmetric Torus. I know that the best way of keeping things safe is to remove the potential energy from a circuit to keep bad things from happening. The problem with depending on a circuit such as the emcotec type of disconnect or to just relying solely on the radio and ESC to keep things safe is failure modes. You can plan for all different failure types but to make it a circuit that isn't a lead brick being added to the plane there are compromises that have to be made. This leads to designing systems that may deal with only the most common types of failures. For example most common diodes and tantalum capacitors usually fail in a shorted mode, but not always. Many carbon resistors will decrease in résistance just prior to opening up. You get the idea, there are just so many possibilities and combinations that in my opinion the only real way to safe a power system is to disconnect the energy source. Ok, now I feel better that I said something. 



        David




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