[NSRCA-discussion] Electric/IC ...was Arming Plug/Receptacle Problem

Mon Feb 9 14:40:09 AKST 2009

I was trying to say they'd be changed again.

Jim O

On Feb 9, 2009, at 2:02 PM, Richard Strickland wrote:

> The rules already favor IC--but we've been down that road...
> RS
>
> > From: joddino at socal.rr.com
> > To: nsrca-discussion at lists.nsrca.org
> > Date: Mon, 9 Feb 2009 13:54:18 -0800
> > Subject: Re: [NSRCA-discussion] Electric/IC ...was Arming Plug/ 
> Receptacle Problem
> >
> > I've been at this longer than most and have known from the beginning
> > that the propulsion system is the key to winning in Pattern
> > competition. It can also be the most frustrating due to constantly
> > changing conditions. I found that the gas engines with spark  
> ignition
> > were a lot more consistent than glow and that reduced the
> > frustration. I have more recently convinced myself that electric is
> > the least frustrating. A few folks have gone back to glow after
> > playing with electric to get more power for windy conditions. We are
> > now getting close to getting more than enough out of electric  
> systems
> > (3 to 4 HP?) and when that happens we won't have these discussions
> > anymore. However, before that happens, the rules will probably be
> > changed to favor IC.
> >
> > Jim
> >
> >
> > On Feb 9, 2009, at 12:39 PM, Jerry Voth wrote:
> >
> > > I've been lurking for a long time and after reading all the things
> > > that one needs to do to successfully fly electric, it makes one
> > > wonder how things would be if electrics were the norm from the
> > > beginning of powered R/C models. It might go like this;
> > >
> > > Hey guys, I just bought this little IC engine and I tried it on  
> one
> > > of my Pattern models and it works really well. "Look what it  
> will do;
> > > 1. It has just as much power as our electric motors.
> > > 2. The only batteries you need are for the flight pack, glow  
> igniter
> > > and the electric starter if you don't like to flip by hand.
> > > 3. All you have to do is pump fuel into the tank, spin the engine
> > > with the starter and fly.The tail gets a little oily, but what the
> > > heck, it's fairly easy to clean up.(Switching the radio on first  
> is
> > > a given.)
> > > 4. You don't have to haul a generator or an extra car battery  
> around
> > > to charge motor batteries."
> > >
> > > Please don't take this the wrong way. It is tongue in cheek and  
> just
> > > an observation. I also have too much time on my hands these days.
> > >
> > > JJV
> > > ----- Original Message ----- From: "Jay Marshall"
> > > <lightfoot at sc.rr.com>
> > > To: "'General pattern discussion'" <nsrca-discussion at lists.nsrca.org 
> >
> > > Sent: Monday, February 09, 2009 1:50 PM
> > > Subject: Re: [NSRCA-discussion] Arming Plug/Receptacle Problem
> > >
> > >
> > >> A 100 ohm resistor may be enough to charge the caps and make  
> the ESC
> > >> "active". Bad idea...
> > >>
> > >> Jay Marshall
> > >>
> > >> -----Original Message-----
> > >> From: nsrca-discussion-bounces at lists.nsrca.org
> > >> [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of  
> Ron
> > >> Van Putte
> > >> Sent: Monday, February 09, 2009 1:14 PM
> > >> To: General pattern discussion
> > >> Subject: Re: [NSRCA-discussion] Arming Plug/Receptacle Problem
> > >>
> > >> Good. I will try it. What wattage 100 ohm resistor? Let's see,
> > >> doesn't sustained power equal voltage squared, divided by the
> > >> resistance? If so, 42 squared, divided by 100 is 17.64 watts.
> > >> That's probably overkill, since the current surge is  
> transitory. How
> > >> about a 100 ohm, 10 watt resistor?
> > >>
> > >> Just thought of something: With the 100 ohm resistor across the
> > >> arming plug receptacle, won't the ESC be on whenever the  
> batteries
> > >> are plugged into the circuit?
> > >>
> > >> BTW, what about Castle Creation's statement that the "spark is  
> your
> > >> friend'?
> > >>
> > >> Ron
> > >>
> > >> On Feb 9, 2009, at 11:55 AM, James Oddino wrote:
> > >>
> > >>> Put a 100 ohm resistor across the arming plug receptacle. Then  
> the
> > >>> capacitors in the ESC will charge without a spark as you connect
> > >>> the batteries. When you connect the arming plug, no spark.
> > >>>
> > >>> Jim
> > >>>
> > >>>
> > >>> On Feb 9, 2009, at 8:08 AM, Ron Van Putte wrote:
> > >>>
> > >>>> I have a problem which I am sure many other E-powered airplane
> > >>>> owners have that I'd like to solve. I use an arming plug to
> > >>>> connect the two 5S Lipo packs to the ESC. On initial contact of
> > >>>> the arming plug with the receptacle, there's a big spark  
> thrown.
> > >>>> Eventually the contacts on the arming plug and receptacle get
> > >>>> burned to the point where the electrical contact is very bad.
> > >>>> Yesterday I had to land my airplane deadstick because (I think)
> > >>>> the ESC saw what it thought was low voltage out of the battery
> > >>>> that was actually due to the burned arming plug/receptacle
> > >>>> contacts. BTW, I am using high-amp Anderson Power Pole
> > >>>> connectors, which are probably more susceptible to having the
> > >>>> contacts burned than would Deans Ultra connectors.
> > >>>>
> > >>>> I have thought about putting a BIG capacitor in parallel with  
> the
> > >>>> arming plug, that would damp the initial current surge which
> > >>>> causes the spark. The capacitor could be removed before flight.
> > >>>> However, I'm wondering if there's a more elegant solution.
> > >>>>
> > >>>> Ron Van Putte
> > >>>>
> > >>>> _______________________________________________
> > >>>> NSRCA-discussion mailing list
> > >>>> NSRCA-discussion at lists.nsrca.org
> > >>>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
> > >>>
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> > >
> > >  
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