[NSRCA-discussion] Arming device

[Matthew Finley]

In my two cents worth.....

For someone to say using an arming plug is not necessary is like saying I'm not going to tighten my prop all the way before I fly, or only put my wing bolts in half way..... Wheel pants, vortex generators, and canalizers cause induced drag, weight, price increase.....






Sincerely,

Matthew E Finley
QCI Technical Assistant
614-557-3846


-------- Original message --------
From: lucky macy via NSRCA-discussion <nsrca-discussion at lists.nsrca.org>
Date: 05/16/2015  10:14 AM  (GMT-05:00)
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


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
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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