[NSRCA-discussion] Fwd: Arming Switch

Sun Feb 12 15:30:37 AKST 2012

Hi Simon…..

Finally….your #3 makes a lot more sense to me.

I’m trying to take things OFF my airplane…not add any more weight or complexity TO it!

Of all the suggestions I have heard, I would be more likely to do it your way if there was a requirement.

Dave Harmon

NSRCA 586

K6XYZ[at]sbcglobal[dot]net

Sperry, Ok.

From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Simon Atkinson
Sent: Sunday, February 12, 2012 6:10 PM
To: NSRCA List
Subject: [NSRCA-discussion] Fwd: Arming Switch

Hi, 

Long time reader, first time poster to the list.

I favor a physical plug of some kind that disconnects the actual battery. I know that the ESC's we use are very safe and that you can use a hold switch to kill the throttle aswell but, hey, things happen and having a broken circuit to any battery guarantees that prop won't turn when I don't want it to. I see it as a simple and cheap safety feature, my argument is why wouldn't wouldn't you do something so simple, convenient and improves the safety of your hobby?

I have used three methods on F3A planes:

1. Deans (female in the plane, male plug to arm)

2. EC5 (ditto)

3. 5mm bullet (female plug fixed inside the plane, male plug on a lead)

For me the the last option is the best. It is the lightest version and doesn't require a plug to be kept separately. Yes, you do have to drill a hole in your plane but you can do it neatly, kind of like fuel line systems that many used previously.

Anyway, great to be part of the conversation.

Regards,

Simon  Atkinson

Brisbane,  Australia

Begin forwarded message:

From: "Dave Harmon" <k6xyz at sbcglobal.net>
Date: 13 February 2012 9:01:34 AM GMT+10:00
To: "'General pattern discussion'" <nsrca-discussion at lists.nsrca.org>
Subject: Re: [NSRCA-discussion] Arming Switch
Reply-To: General pattern discussion <nsrca-discussion at lists.nsrca.org>

Hi Keith….

Actually I DID take into account that there IS a possibility that the ESC could fail….but I feel the odds of that happening are as I said, a lot less than someone mishandling a transmitter.

How about just plugging the battery in and putting the canopy on within the 3 minute starting period??

The airplane should not have to just sit there plugged in and ready to go like a fueled up glow powered airplane….

After landing someone picks up the model and turns off the radio switch….if the helper picks up the airplane and the ESC malfunctions he has ahold of it.

I understand your and others concerns but I just don’t think the external plug thing is necessary.  

I just don’t see the need to have a battery in the plane unless it is manually restrained and going to be flown within the next 3 minutes.

I don’t mean to imply that I plug in the battery without straddling the fuselage….I do!

Dave Harmon

NSRCA 586

K6XYZ[at]sbcglobal[dot]net

Sperry, Ok.

From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Keith Black
Sent: Sunday, February 12, 2012 4:29 PM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] Arming Switch

Dave, you're points are correct, but you're not taking into account a malfunction of the speed controller itself. They have been know to malfunction, so the safest approach, as Earl suggests, is to assume that anytime the battery is connected to the controller the motor may go to full throttle. Until you unplug the battery the thing is hot and dangerous regardless of your fail safe or switches on the transmitter. 

Regarding pulling the disconnect (whether under canopy or via external arming pin), step over the model between wings and stab (just like we used to run up the glow models) and reach down to pull the plug. If it goes full throttle the back of your legs will stop forward momentum.

I see far too often that people switch off their radios with the plane in a potential dangerous position. This is putting a lot of trust in the technology when it's not necessary. When I retrieve my model,  transmitter in hand or not, I make sure it is pointed away from people or property.

Keith 

On Sun, Feb 12, 2012 at 2:28 PM, Dave Harmon <k6xyz at sbcglobal.net> wrote:

+1 on that.

Rather than having a disconnect, I think ensuring that the fail safe function of the radio is set properly is the way to go.

Generally…with today’s 2.4g radios…..not 72mhz PCM radios….I trust the electronics more than someone holding the transmitter. 

Besides….with a disconnect it would be my luck to rip the side of the fuselage off and start a fire that way………or not being able to let go of a full throttle model to pull the disconnect….in this case just turn off the transmitter and/or have an external radio switch and turn off the receiver.

The ESC will shut off the motor when the ESC loses the pulse from the receiver…even if the failsafe is NOT configured correctly.

Everyone already knows this….or should know it…. but it’s a good thing to mention anyway…..

Dave Harmon

NSRCA 586

K6XYZ[at]sbcglobal[dot]net

Sperry, Ok.

From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Keith Hoard
Sent: Sunday, February 12, 2012 1:44 PM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] Arming Switch

I'd rather not cut a hole in my plane in the first place, or add another point of failure to the system. . . .

Keith Hoard
Collierville, TN
khoard at gmail.com

On Sun, Feb 12, 2012 at 1:37 PM, Ronald Van Putte <vanputte at cox.net> wrote:

You can mount a female Deans connector in a piece of thin plywood, use Pacer Pro Zap to glue the Deans connector to the plywood and, after cutting an appropriate hole in the side of the fuselage, glue the assembly inside the fuselage.  Use a male Deans connector with the leads soldered together as an arming plug.

Or you can buy a SharpRC SafeArm (http://www.sharprc.com/catalog/index.php?cPath=43)

Being cheap, I do the former.

Ron Van Putte

On Feb 12, 2012, at 11:55 AM, Ron Hansen wrote:

What are the available arming switch options?

Thanks

Ron

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