[NSRCA-discussion] bullets

Jon Lowe jonlowe at aol.com
Wed Mar 30 07:51:44 AKDT 2011 

It's caused by a build up of ohms and electrons.  That's why RVP carries a can of "Ohm Off" with him to clean his airplanes!


Jon



-----Original Message-----
From: AtwoodDon at aol.com
To: nsrca-discussion at lists.nsrca.org
Sent: Wed, Mar 30, 2011 10:41 am
Subject: Re: [NSRCA-discussion] bullets


I have had the same experience as Earl with regards to the Dean's Ultra connectors.  I use a Deans male as a shorting plug so it gets connected and disconnected each flight.  The spark does occur at the tip of the negative contact and gradually erodes it but as Earl says, the tip is not the contact surface, it is the flat side of the blade so no contact area is lost.  Over 1000 flights on one shorting plug and no problems or loss of performance.  Contact cleaner does work well at cleaning up the gummy residue that forms.  Anyone have any idea what that gummy/greasy stuff is or where it comes from?
 
Don
 

In a message dated 3/30/2011 7:40:49 A.M. Pacific Daylight Time, ejhaury at comcast.net writes:
Let's   leave the DWT alone!

I'll chime in with a different perspective on   connectors though. As 
mentioned, there can be a good deal of variance with   bullets. Providing good 
tension isn't easy and maintaining it over   repeated use is even more 
difficult. Some designs work better than others   and folks experiencing good 
service have done their homework. Bullets are   also easy to solder to heavy 
gauge leads.

OTOH - I've very good   service from the Deans Ultra. The attractive part of 
the design (to me) is   that they're simply buss bars held together with 
spring tension. The   surface area of the bars is way more than we need for 
contact and the   thickness is plenty for handling the amps. They do get a 
little nasty   looking on the ends - but I haven't found that to significantly 
reduce   contact area or function. In cutting the "female" side apart after 
1000+   flights I found no degradation of anything except the entrance end 
where   the arc occurs, the wear pattern demonstrated full contact. They are 
more   difficult to solder leads to and can easily be ruined in the process. 
If   the plastic is melted allowing the bar to become misaligned, full contact   
will not be achieved.

Also , either connecter will benefit from an   occasional cleaning with a good 
contact cleaner.

Great to have   choices!

Earl

----- Original Message ----- 
From: "Ronald Van   Putte" <vanputte at cox.net>
To: "General pattern discussion"   <nsrca-discussion at lists.nsrca.org>
Sent: Wednesday, March 30, 2011   9:15 AM
Subject: Re: [NSRCA-discussion] bullets


I am definitely   not going to argue with Verne on this one.  He's had
more experience   than I do on this subject.  However, if somebody
wants to debate the   "downwind turn", let's get started.  <vbg>

Ron

On Mar   30, 2011, at 8:42 AM, <verne at twmi.rr.com> wrote:

> FWIW, the   5.5 mm connectors I used were of the slotted variety. I  ended 
>   up abandoning those after discovering too much variance from  one   
> manufacturer to the next and sometimes within the same    manufacturer. I 
> had connectors that ranged all the way from too    loose to make a good 
> connection to so tight that you couldn't   put  them together. The bulge you 
> mention in the 4mm connectors   is  actually the "spring" that compensates 
> for slight   tolerance  variances. I agree that there's not as much contact 
>   area as the  slotted type, but it comes down to how much is enough? From   
> my  experience, the 4mm work just fine without the hassle of   trying to 
> find connectors to match what you've already got on all   your  batteries, 
> charge leads, and so on. It gets a little   pricey to  start all over and 
> I've done it twice. With the 4mm,   I just add as  I go without a hitch.
>
>   Verne
>
>
>
> ---- Ronald Van Putte   <vanputte at cox.net> wrote:
>
> =============
> I have   gotten these "no bulge/slotted design" connectors from two
>   sources:  HobbyKing and BidProduct.  You have to look at the   pictures
> carefully to see that they are the "no bulge/slotted   design".
>
> I really like BidProduct for acquiring large   quantities of the
> smaller items, like connectors, extensions and   hardware for my small
> hobby shop.  Many items can be purchased   with free shipping.
>
> Ron
>
> On Mar 30, 2011, at   4:09 AM, Houdini76 at aol.com wrote:
>
>> Ron, what brand of   connectors has the no bulge/slotted design?  Do
>> you use 4, 5   or 6mm?
>>
>> Rob
>>
>>
>> In a   message dated 3/29/2011 8:01:08 P.M. Eastern Daylight Time,
>>   vanputte at cox.net writes:
>> Good stuff Verne.
>>
>>   I have noticed the difference in bullet connector design.  I   used
>> to buy 3.5mm bullet connectors which had a "bulge" in the   center of
>> the male part.  Recently, I noticed some 3.5mm   bullet connectors
>> which had no "bulge" in the male part.    They push into the female
>> part because there's a chamfer on the   tip of the male part, which
>> compresses the slotted male connector   so it will fit into the
>> female part.  The big advantage of   this design is that virtually
>> all of the connector is mated with   the other half, unlike the ones
>> with a "bulge", which have   significantly reduced contact area.
>> Then I noticed that you can   buy this same design in 4mm, 5mm and
>> 6mm bullet connectors.    My opinion - these are far superior.
>>
>>   Ron
>>
>> On Mar 29, 2011, at 6:30 PM, Verne Koester   wrote:
>>
>>> Jerry,
>>>
>>> I   started out with Deans Ultra’s. They worked fine but didn’t   wear
>>> too well. The arc from connecting them together was   really chewing
>>> them up. Then I switched to 5.5mm bullets.   Those worked great and
>>> the arc did damage where it didn’t   matter. The problem I
>>> discovered later was when I needed some   more. Not all 5.5mm are
>>> created equal and I ran into some   serious fit problems from one
>>> batch to the next. I noticed   that most of the Europeans were using
>>> 4mm bullets. These are   made a little different than the 5.5mm
>>> and       have more “spring” in them so the tolerances don’t have to
>>> be   so close. Like the 5.5mm bullets, the arc damage happens on   the
>>> very tip which is not part of the actual electrical   connection.
>>> I’ve been very happy with the 4mm bullets and will   be starting my
>>> third season with them. BTW, I never noticed   any power changes
>>> from the Deans to the 5.5’s to the 4’s. Hope   this helps.
>>>
>>>
>>>
>>>   Verne Koester
>>>
>>>
>>>
>>>   From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-
>>>   discussion-bounces at lists.nsrca.org] On Behalf Of Jerry   Stebbins
>>> Sent: Tuesday, March 29, 2011 5:29 PM
>>>   To: Discussion -NSRCA
>>> Subject: [NSRCA-discussion]   bullets
>>>
>>>
>>>
>>> All   E's. What size bullets have you settled on for your packs/ESC
>>>   connections? Seems like something that would sorta get
>>>   standardized after a lot of 70A usage. I have heard from 3.5   to
>>> 6.0. Would think it would work itself out to support the   nominal
>>> max. I that most see. I am sure 3D needs all they can   get but for
>>> AMA/FAI patterns seems like it otta round off   pretty close for
>>> most using 5s   packs.
>>>
>>> Thanks   ahead
>>>
>>> Jerry
>>>
>>>   _______________________________________________
>>>   NSRCA-discussion mailing list
>>>   NSRCA-discussion at lists.nsrca.org
>>>   http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>>
>>   =
>>
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