[NSRCA-discussion] Arming device

Sun May 17 12:10:44 AKDT 2015

-1

Jon

On Sunday, May 17, 2015 ronlock--- via NSRCA-discussion <nsrca-discussion at lists.nsrca.org> wrote:

+3 

From: "Ronald Van Putte via NSRCA-discussion" <nsrca-discussion at lists.nsrca.org> 
To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org> 
Sent: Sunday, May 17, 2015 9:57:15 AM 
Subject: Re: [NSRCA-discussion] Arming device 

+2 

On May 17, 2015, at 8:53 AM, Derek Koopowitz via NSRCA-discussion < nsrca-discussion at lists.nsrca.org> wrote: 

+1 

Sent from my iPad 

On May 17, 2015, at 9:37 AM, John Ford via NSRCA-discussion < nsrca-discussion at lists.nsrca.org> wrote: 

Well, I figured I would stay away from this discussion, but it scares the crap out of me so maybe I can scare the crap out of someone else and take the discussion in a different direction that could produce results… 

Rest assured, I won't even debate the merits of widgets…I won't argue in favor or against arming switches, failsafes, or anything else…how about that? 

So, from the perspective of someone who has managed (or tried to manage...) risk in professional settings for many years, here is how I see this whole debate and what, frankly, scares me… 

If you put yourself in the shoes of a spectator reading this year-long discussion thread, there is one thing that everyone seems to agree on…that an electric pattern plane sitting in the pits by itself is a "loaded gun". On that point, there seems to be universal agreement.  

The heated debate in this thread is about how to make that plane safe from inadvertent starts and causing damage or injury. I think we all agree on that. Simple enough. 

Now put yourself in the shoes of the lawyer who is working for the spouse of a pattern flier who bled to death before the ambulance could arrive at the contest site, because the prop sliced his femoral artery while he was squatting in front of the plane, while installing the canopy. 

The lawyer's case is pretty much made for him, isn't it? A known hazard, surrounded by 25 pilots (or at least one designated caller) all belonging to an organization that have established in 4156 emails that the hazard was real and present..all of whom neglected to restrain or mitigate the known hazard in any way. All of these people, whilst assuming the pilot had some sort of lock-out device in place, made no effort to determine if it was adequate or even installed correctly. And even if it had been, all these people are involved in a debate about the validity of such devices and have been unsuccessful in establishing a universal practice. Yet, they took no mitigating actions in the mean time, leading up to the fatality.  

So, I was at a contest yesterday, and I was asked to call for a pilot. If he asks me prior to putting the battery in the aircraft, I always hold the plane while he does it. When I set the plane on the centerline, I always look to him to signal me to let it go. When I return the plane to the pits, I always inform the pilot verbally that the plane is still armed and I wait until he disconnects stuff physically so I can see it, then I get up and walk away. I really don't care what failsafe, interlock, or widget he uses to disarm the plane electronically…I wanna see some sort of physical broken connection before I feel my personal responsibility ends.  

I've had several pilots say to me.."ok, John, I disarmed it already…it's OK"… NO, it's not OK! Not until I can see the physical disconnect.  

When you ask me to call for you, and you ask me to handle a 5-hp, 80 mph meat-cutter in the middle of a crowd of 30 people…I feel deeply responsible for IT, for YOU, and for ALL the pilots on the line. I WILL insist on you showing me that this thing is physically disarmed, or else you can find another caller…it's that simple. 

See, I promised I wouldn't discuss widgets…I didn't even tell you how mine is set up. But, did I scare the crap out of you? 

Out of the box… 

John 

On May 16, 2015, at 11:43 PM, John Gayer via NSRCA-discussion < nsrca-discussion at lists.nsrca.org> wrote: 

You need to have the motor at least idling before turning the transmitter off. The test should prove that failsafe will stop the motor and is not just a throttle hold. 
John 

On 5/16/2015 4:55 PM, David Harmon via NSRCA-discussion wrote: 

With as much talk that has gone on and on andonandonandonandon about this arming device......puff..puff....not much percentage. Especially when it is so easy to check..... Before the first takeoff of each pilot on the first round....the helper holds the plane off the ground and the pilot turns off the transmitter. The judges can verify that the motor does not start. Easy....no drama. Oh wait....this was never done with glow....but I HAVE seen several guys chawed up by a howling YS. One time a guys airplane chased him in a circle as he was trying to catch it...he had one leg in front of one wing and for an old guy he moved pretty quick. I can't describe how long I laughed about that incident. In the end....my opinion is checking the fail-safe function should be a must at each contest. David Harmon Sperry, OK -----Original Message----- From: NSRCA-discussion [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Ron Van Putte via NSRCA-discussion Sent: Saturday, May 16, 2015 4:58 PM To: General pattern discussion Subject: Re: [NSRCA-discussion] Arming device I have seen too many situations where an ID10T error caused serious damage that would have been precluded by the use of a shorting plug. What percentage of pilots’ transmitters would fail the fail safe test? Anybody? Ron Van Putte On May 16, 2015, at 4:08 PM, Whodaddy Whodaddy via NSRCA-discussion <nsrca-discussion at lists.nsrca.org> wrote: 

Seems like we have to many people with to much time on their hands sitting 

around fantasizing about what might happen if .... Really.... if u cant control the aircraft in all aspects then u prolly shouldn't have one... Let alone legislate what i need to be doing with mine... 

Gary Sent from my iPhone 

On May 16, 2015, at 3:58 PM, Jon Lowe via NSRCA-discussion 

<nsrca-discussion at lists.nsrca.org> wrote: 

Code doesn't apply to model airplanes. Cars do not disconnect the 

battery, except on race cars with a disconnect switch in case of a wreck. Normal road cars do not, and modern cars leave a lot of things connected when the ignition is off. A lot of cars have underhood fans that run for awhile after the car is shut off. 

If this was a big issue, AMA would address it with all model aircraft, 

not just pattern. Electric is common in helis, controline, etc. We are over killing this something awful. 

Jon 

On May 16, 2015 2:11 PM, Vicente Bortone via NSRCA-discussion 

<nsrca-discussion at lists.nsrca.org> wrote: 

the ignition switch. 

On Saturday, May 16, 2015, Vicente Bortone <vincebrc at gmail.com> wrote: 

On Saturday, May 16, 2015, Del R via NSRCA-discussion 

<nsrca-discussion at lists.nsrca.org> wrote: 

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 _______________________________________________ NSRCA-discussion mailing list NSRCA-discussion at lists.nsrca.org http://lists.nsrca.org/mailman/listinfo/nsrca-discussion 

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-- Vicente "Vince" Bortone 

-- Vicente "Vince" Bortone 

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