[NSRCA-discussion] Arming device

Sat May 16 12:05:48 AKDT 2015

Thanks guys for the refresher. Yes David if anything can go wrong it will - eventually.
I'm more concerned with human error such as not properly setting Fail Safe, leaving a surprised airplane handler about one second to get several horsepower under control.
I find using an external plug a convenient and visible indicator, and yes I've failed to remove it defaulting to TX and ESC safety features which worked - that time. I'm more attentive now.
Jim

From: NSRCA-discussion [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Keith Hoard via NSRCA-discussion
Sent: Saturday, May 16, 2015 8:26 AM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] Arming device

OK.  So if I move inside my plane, I'll install one. Thanks for the heads up. 

-Keith Hoard
-Sent from my Windows Phone
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From: Vicente Bortone <mailto:vincebrc at gmail.com> 
Sent: ‎5/‎16/‎2015 10:23
To: Atwood, Mark <mailto:atwoodm at paragon-inc.com> ; General pattern discussion <mailto:nsrca-discussion at lists.nsrca.org> 
Cc: Keith Hoard <mailto:klhoard at hotmail.com> 
Subject: Re: [NSRCA-discussion] Arming device
The code requieres external disconnect.  So that rule does not meet electrical codes.  

On Saturday, May 16, 2015, Atwood, Mark via NSRCA-discussion <nsrca-discussion at lists.nsrca.org> wrote:
No rule changes in effect for this year. 

Also, the rule that's proposed is to restrain the plane while running or armed.  No requirement that the arming plug be external.  Just that a physical disconnect is required to leave the plane unattended. 

Sent from my average intelligence  phone 

On May 16, 2015, at 10:16 AM, Keith Hoard via NSRCA-discussion <nsrca-discussion at lists.nsrca.org> wrote:
So, is an EXTERNAL ARMING PLUG required or not this year at the Nats?  Cause I still haven’t made hotel reservations . . 

From: NSRCA-discussion [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of lucky macy via NSRCA-discussion
Sent: Saturday, May 16, 2015 9:15 AM
To: nsrca-discussion at lists.nsrca.org
Subject: Re: [NSRCA-discussion] Arming device

As the original poster who started the original thread that sailed the seven seas and spun a new universe and war of words, I can tell you I was totally unswayed by proponents of not using something like the Power Unlimited Arming Plug.  This is despite the fact I didn't want to use one either if it made sense was really hoping there was more to the logic and technical execution of how those without external arming plugs were operating safely that what I was originally guessing was there.

 So I long ago added such a device like I've done previously to my new Mythos S Pro over the winter.  After reading every one of the emails I now think it's silly not to have an external arming plug and I hope the rules are enforced at the Nats this year on the subject cuz some of the line of the excuses that had me in stitches were that such a device adds unnecessary cost, weight, complexity or, god bless, extra drag that's not symmetrical on the airframe.  Those need to be, well, dealt with...  :-)

Member number 1 of the new external arming plug police...  ;-)

Lucky

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Date: Sat, 16 May 2015 13:16:37 +0000
To: circuitboard35 at yahoo.com; nsrca-discussion at lists.nsrca.org
Subject: Re: [NSRCA-discussion] Arming device
From: nsrca-discussion at lists.nsrca.org
I'm in agreement.
Ron Lockhart

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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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-- 
Vicente "Vince" Bortone
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