06-30-2011, 07:00 PM | #21 | |
Pebble Pounder Join Date: Aug 2010 Location: Arvada
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06-30-2011, 07:12 PM | #22 | |
RCC Addict Join Date: Jul 2009 Location: reelsville
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IMO if you run small wire and weak packs you might as well just run cheap machine wound motors. Why run a motor that can pull real power when you don't give it the power available to pull? | |
06-30-2011, 07:13 PM | #23 | |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
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EP- I have thought about doing threaded posts and plugs before. Not many people would appreciate a mechanical connection in this hobby. In robots they would love it. Not very often, unless I am bashing around or running a scaler. It is normally when I need to jump a gap or pop through a section fast. It would certainly be used less often in a comp unless you are Gatekeeper. I'm just a nut for thick wires though, I hate wire heat. My ebike has 4ga. Only needs 12ga considering the amp limit I run. It still runs cooler though, and my top speed and power is certainly increased. Quote:
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06-30-2011, 07:30 PM | #24 | |
I wanna be Dave Join Date: Nov 2010 Location: 07456 N. NJ USofA
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Resistance with no load does not equate to "current capacity" at high loads. Granted, I usually deal with 100KVA to 1200KVA UPS systems, a "Bit" () different than that our crawler applications. Regardless, all the best stuff through 98% of a system can be killed by the 2%. Gold plated connectors just means the connection won't change over time (measureably), it still comes down to cross section/contact area. You & I can toss back & forth all night, it really won't matter in the referenced application. Besides, it's posted on the Internet, so it must be true..... I will likely NOT argue electric motor theory with you or Eddie......I know a bit, but know when I'm likely outclassed. (I have tons of class....most of it low though.....hehe) | |
06-30-2011, 08:01 PM | #25 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
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I love a good conversation about it, I wouldn't consider it an argument at all. Educate me, please! Very good point about resistance not equating to current capacity. I'm more worried about voltage drop and heat. What are the next items down the chain for current capacity? Heat dissipation, duty cycle, thermal mass.....? You lowbrow, hehehehe Last edited by JohnRobHolmes; 06-30-2011 at 08:06 PM. Reason: speelllling |
06-30-2011, 08:10 PM | #26 | |
I wanna be Dave Join Date: Apr 2007 Location: Arlington, Washington
Posts: 2,303
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John only argues with me....ever one else he just has discussions. Look at this way.....wire is like tits....bigger is better..... I do promise you though, 1/4 throttle, 1/2 throttle or full throttle....voltage drop happens. The fact you are rarely at full throttle is irrelevant....smaller wire is making everything in the circuit work harder at all times. I spent 10 years in competitive car audio.........even worked in the business. Voltage drop is a big deal.....trust me....same thing, quarter volume, half volume or at full....just the way it works. Now whether most crawler guys can FEEL it, whole nother matter....... Later EddieO Quote:
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06-30-2011, 08:16 PM | #27 | |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
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Hey, we agree on everything this time Maybe we can make em discussions now Most people can't feel the difference between many system tweaks. Too much geardown to show subtle changes. In fact, the only thing I can actually feel with fatter wire is more broken parts in my palms Quote:
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06-30-2011, 08:25 PM | #28 | |
RCC Addict Join Date: Nov 2006 Location: Lowell, Arkansas
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A larger capacity pack will have higher voltage under load than a smaller one. I'd speculate that the voltage difference between a 450 and 850 pack under full load is far greater than the voltage drop difference between 18 and 16 awg wire. Just fyi, I run 850's. I wouldn't run anything smaller just because of smaller capacity pack's reduced voltage under load. I want power when it is necessary, but I'm practical about it. Hey, when I was racing touring cars (where you are WOT the vast majority of the time), I worried about getting the last fraction of a watt. But for crawlers, it's kind of like trying to pick fly poop out of pepper. Why bother? | |
06-30-2011, 08:38 PM | #29 |
I wanna be Dave Join Date: Jan 2008 Location: Arat Alabama
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06-30-2011, 08:42 PM | #30 |
I wanna be Dave Join Date: Apr 2007 Location: Arlington, Washington
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06-30-2011, 09:09 PM | #31 |
RCC Addict Join Date: Jan 2010 Location: Dallas
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I am an electrical idiot so here is one for you guys who get this stuff much better than me. I am running mini mambas and I used the stock wires that came with the mini's. I did wind up using what I had to connect the motor leads. As a result I now have a smallish gauge wire coming out of the esc to a larger gauge wire going to the motor. Is this bad?
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06-30-2011, 09:31 PM | #32 |
I wanna be Dave Join Date: Apr 2007 Location: Arlington, Washington
Posts: 2,303
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umm, well if you are adding unneccesary solder to the circuit, then you are adding resistance....the smaller wire will also become a bottleneck in the circuit. It's not very desirable and I would try to clean up your wiring if possible..... Later EddieO |
06-30-2011, 10:41 PM | #33 |
I wanna be Dave Join Date: Mar 2008 Location: In the Dark Edges of your Mind
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Building a dual esc MOA in the size of bodiless chassis we are running these days is like trying to shove 10 lbs of crap in a 5 lb bag. I use 16ga. wire in an effort to make it easier stuff the "bag". Many of the small lipos I use come with 16ga. or smaller wire anyway. I don't miss whatever amount of power the smaller wire or batteries lose. I'll touch my truck before I fold the chassis in half trying to power it out of a crevace. This thread is full of great information though. I was considering micro deans.... but not now |
06-30-2011, 10:45 PM | #34 |
RcBros Hobbies Join Date: Nov 2005 Location: Oregon
Posts: 4,646
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Just a little info for those guys who don't know a little trick to make the mini deans safe. I only use them on the MRC for size but to keep everything safe, run to your local auto parts store and pick up some vacuum line caps. They fit perfect on the mini deans and keep everything safe! I too run 16g just to save some room when possible. I'm not "good" enough to notice the difference, so no harm no foul lol. |
06-30-2011, 10:53 PM | #35 |
I wanna be Dave Join Date: Apr 2007 Location: Arlington, Washington
Posts: 2,303
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I liked it better when it switched to tits.... Later EddieO |
07-01-2011, 12:45 AM | #36 |
RCC Addict Join Date: Dec 2006 Location: Oak Ridge, TN
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Thought I was learning something but now all I can think of is tits...
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07-01-2011, 01:51 PM | #37 |
I wanna be Dave Join Date: Nov 2010 Location: 07456 N. NJ USofA
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07-01-2011, 02:16 PM | #38 | |
Quarry Creeper Join Date: Aug 2009 Location: Phoenix
Posts: 224
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I would say this thread is no good without pictures but that would just get us in big trouble.... I run dual Mamba Micro Pros and they have 16ga wire connected to them so that is what I used to wire up mine and a buddy's XR. Now I don't know if this limits my Brood's power capacity but they work for me. Hell I'm a rare one still running 2S batteries at this point. I had 5 new packs and wanted to use them. I will go 3S in the future though. | |
07-01-2011, 02:45 PM | #39 |
RCC Addict Join Date: Jun 2005 Location: St. Albans
Posts: 1,441
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I'm with EeePee... all black wiring but I'm a 13ga man. I still long for the days of hardwiring motor and battery. It made wiring jobs so nice and neat. Wiring always looked nice and there were never wires or plugs flopping all over the inside of a car. I hate using plugs.
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07-01-2011, 06:28 PM | #40 | |
I wanna be Dave Join Date: Nov 2010 Location: 07456 N. NJ USofA
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We chopped down all wires so they fit + a tiny bit. ESC was soldered direct to the motor (a bit of wire twisting to reduce EMI/RFI), packs had solder tabs on them to direct solder to the ESC. We used medium silver content solder to reduce resistance. The RX was soldered into the ESC & steering servo. This was for 27T "club stock" motors. Did it help? Who knows. Did I feel better? Absolutely! Granted it shafted me last fall when my son & I started carpet racing, we needed transponders that used external power. All my connections were soldered so I had to drag out an old RX connector & solder it in to power the transponder. In crawlers, going ~14ga wire is fine. If you have an ESC that has smaller ga wires on it, keep them really short to reduce losses. About the only time we really load a rig is when we're in a bind. That is usually a good time to limit power....BEFORE you break stuff. | |
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