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

Mon Feb 9 13:03:01 AKST 2009

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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> >
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