07-23-2017, 07:41 AM | #1 |
Quarry Creeper Join Date: Aug 2014 Location: home
Posts: 392
| Proper brushless set-up
Ok. So its said to tune your kv to your desired wheel speed. I tune for maximum runtime; with 4p brushless there is wheel speed. My problem that i'm having is that i have the smallest pinion and the only spur for my particular RC. I get abot 7mins of runtime on a quality 2s 5000mah pack. I know there are "slightly" higher mah packs that will fit my RC, but from experience i know that it will only add about 2 or 3mins of extra runtime... The motor is a 4p 3500kv gearing is 47/12 it is a 4x4 sc and there isn't a battery extension made for it. It weighs stock 5.5lbs. My motor temps after a full pack are about 135-140* mid-day and about 85-93* for the esc... Is the only option go with 2 super shorties in parallel? I can't remember the mah ratings of the last ones i saw...but i think it was around 4000mah. Also will Lowering the C-rating increase run time; as it's not pushing all the amps/capacity out of the pack? The C-rating of my pack is 65c 120c burst... I'm going to test my overkill motor theory...i have a 2150kv 6s capable 70mm 4p motor that should be arriving any day now. I don't plan on running it on 6s but with the gearing i was running a brushed 21t on and same cell battery should yeild great results...At least thats my hypothesis. T.I.A. Sent from my LGAS375 using Tapatalk Last edited by kongluc; 07-23-2017 at 07:48 AM. Reason: Edit |
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07-23-2017, 08:20 AM | #2 |
MODERATOR™ Join Date: Jul 2004 Location: Ohio
Posts: 18,928
| Re: Proper brushless set-up
7 minutes of run time in a crawler? That's pretty bad.
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07-23-2017, 08:27 AM | #3 |
I wanna be Dave Join Date: Jun 2016 Location: Deep in the Everglades
Posts: 5,818
| Proper brushless set-up Totally agree. Noticed you said sc..... Short course go fast ? I'm lost my slash4x4 give 25 min run time on a 5000mah. And it's a speed monster. High c batteries increase run time in a high draw rig Hang up and Drive |
07-23-2017, 08:31 AM | #4 |
MODERATOR™ Join Date: Jul 2004 Location: Ohio
Posts: 18,928
| Re: Proper brushless set-up |
07-23-2017, 08:37 AM | #5 | |
Quarry Creeper Join Date: Aug 2014 Location: home
Posts: 392
| Re: Proper brushless set-up Quote: And anyways it's being converted to a rally car and it's in the rally section...you should stop being so closed minded peepee Why'd you move my thread eepee? Sent from my LGAS375 using Tapatalk Last edited by kongluc; 07-23-2017 at 08:45 AM. Reason: Edit | |
07-23-2017, 08:39 AM | #6 |
Quarry Creeper Join Date: Aug 2014 Location: home
Posts: 392
| Re: Proper brushless set-up
It belongs in the electronics forum peepee Sent from my LGAS375 using Tapatalk |
07-23-2017, 09:06 AM | #7 |
MODERATOR™ Join Date: Jul 2004 Location: Ohio
Posts: 18,928
| Re: Proper brushless set-up
No it doesn't, it's not a crawler. I moved it because it's not a crawler. If it was a Rally car thread, it should be in the Rally forum (which makes no sense on a crawler site either, but that's another can of worms...).
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07-23-2017, 09:12 AM | #8 | |
Quarry Creeper Join Date: Aug 2014 Location: home
Posts: 392
| Re: Proper brushless set-up Quote:
Sent from my LGAS375 using Tapatalk | |
07-23-2017, 09:18 AM | #9 |
MODERATOR™ Join Date: Jul 2004 Location: Ohio
Posts: 18,928
| Re: Proper brushless set-up No need, I've been here 13 years now. I understand how this place works, unlike you who doesn't grasp the concept of this being a RC Crawler website (with stupid sub forums that are irrelevant other than money grabs). The Electronics Forum is for RC crawlers. Imagine if it were for everything electronic in the world, so how would that relate to RC crawlers? It wouldn't.
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07-23-2017, 09:22 AM | #10 |
Quarry Creeper Join Date: Aug 2014 Location: home
Posts: 392
| Re: Proper brushless set-up
I'm not going to argue with you...get-yourself-off on someone else Sent from my LGAS375 using Tapatalk |
07-23-2017, 09:27 AM | #11 |
Quarry Creeper Join Date: Aug 2014 Location: home
Posts: 392
| Re: Proper brushless set-up
I think you're just intimidated...and happy all you gotta do is sit behind your keyboard... Sent from my LGAS375 using Tapatalk |
07-23-2017, 09:52 AM | #12 | |
RCC Addict Join Date: Aug 2013 Location: Missoula
Posts: 1,346
| Re: Proper brushless set-up Quote:
EeePee has a pretty firm grasp on how the site works. Usually best not to start shit just to start shit. Running a big motor on lower volts will not be super efficient. Big motors are heavy, everything inside is heavy. Getting that going and keeping it going takes power. Matching an appropriate ESC, motor and battery to your rig will produce the highest efficiency. | |
07-23-2017, 10:03 AM | #13 | |
Quarry Creeper Join Date: Aug 2014 Location: home
Posts: 392
| Re: Proper brushless set-up Quote:
As for the other motor it is a 50mm 550 4p 3500kv...it is stock and that's the one i'm trying to get to run longer... I've talked with manufacturers C.S. agents and they'd claimed that 1/8 offroad buggy's run about 15-20mins on similar 4s packs in mains...i'm just trying to scale it down... Sent from my LGAS375 using Tapatalk | |
07-23-2017, 11:23 AM | #14 | |
RCC Addict Join Date: Aug 2013 Location: Missoula
Posts: 1,346
| Re: Proper brushless set-up Quote:
A complete 1/8 scale system on 4s in a 1/10 truck will work fine. It will be heavy and produce more power than you reasonably need. Putting a 2s in to slow it down will just make for a heavy, slow, unnecessary power system. Like I said, match the complete system to your requirements. A tiny ESC won't like a huge motor. A huge ESC won't like 7.4V. My 1/8 scales will run for a long time bashing around on 5200mAh batteries, 30+ minutes. That's with proper 1/8 scale systems, running 4s and 5s on 11lb rigs. | |
07-23-2017, 11:31 AM | #15 | |
Quarry Creeper Join Date: Aug 2014 Location: home
Posts: 392
| Re: Proper brushless set-up Quote:
The 70mm can will be run at 3s. It's a 550 The 50mm can "is" mostly run on 2s. It's a 550 They are different brands. Just like the castle 3800kv is not considered a 550 but it's significantly longer than a 540...still a 540.. but a few mm longer for they heavier duty.. Sent from my LGAS375 using Tapatalk Last edited by kongluc; 07-23-2017 at 11:32 AM. Reason: Edit | |
07-23-2017, 11:49 AM | #16 | |
RCC Addict Join Date: Aug 2013 Location: Missoula
Posts: 1,346
| Re: Proper brushless set-up Quote:
Good luck, your attitude will get you far. | |
07-23-2017, 11:52 AM | #17 | |
Quarry Creeper Join Date: Aug 2014 Location: home
Posts: 392
| Re: Proper brushless set-up Quote:
So you are saying the new castle slate does not come 1900kv and is not 4s capable even though it's a 540 and the manufacturer specs it as so? Sent from my LGAS375 using Tapatalk | |
07-23-2017, 12:00 PM | #18 |
Quarry Creeper Join Date: Aug 2014 Location: home
Posts: 392
| Re: Proper brushless set-up
I have no reason to lie...bc i don't lie 36mmD 70mmL read the specs... But one would be looney to run it on 6s Same size as castle 2400kv http://m.ebay.com/itm/GoolRC-S3670-2...%257Ciid%253A1 Sent from my LGAS375 using Tapatalk |
07-23-2017, 12:21 PM | #19 | |
I wanna be Dave Join Date: Feb 2013 Location: NW Indiana
Posts: 3,196
| Re: Proper brushless set-up Quote:
a 1/8 can certainly run in a 1/10 scale rally providing it fits with or without modification. That being said, as long as the entire system is matched as Maslin suggested, you will get good run times. It is painfully obvious that you dont have a good match with regard to the ESC and Motor. "Also will Lowering the C-rating increase run time; as it's not pushing all the amps/capacity out of the pack? The C-rating of my pack is 65c 120c" The c rating does not measure how much the battery "pushes" batteries dont "push" anything, its a measure of how easily and quickly they will allow the current to flow as needed. The demand comes from the ESC/Motor Last edited by allanon1965; 07-23-2017 at 12:24 PM. | |
07-23-2017, 12:27 PM | #20 | |
Quarry Creeper Join Date: Aug 2014 Location: home
Posts: 392
| Re: Proper brushless set-up Quote:
Sent from my LGAS375 using Tapatalk | |
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