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11-12-2020, 02:43 PM | #1 |
Newbie Join Date: Feb 2013 Location: San Antonio
Posts: 4
| Do I need a bec to run a 1/10 servo?
Edit: I found a bunch of threads that had bec's buried in them. It looks like some folks with lipo don't need it and some run one regardless. I have a cc bec sitting in a drawer so I might as well use it. I know this may have been answered elsewhere but I couldn't find it. I built a custom servo tray and now I have a high torque 1/10 servo on my mrc. I'm not having brown outs yet while running a 2s lipo with the stock electronics. I'm wondering if I'm just lucky and it hasn't happened yet. My question after all that is, should I be running a bec with the 1/10 servo? I'm going to be upgrading to a brushless motor and esc soon. Yay. Last edited by Sabunimwil; 11-12-2020 at 02:58 PM. |
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11-12-2020, 03:53 PM | #2 |
I wanna be Dave Join Date: Jun 2017 Location: Humboldt county
Posts: 4,482
| Re: Do I need a bec to run a 1/10 servo?
Its not based on being 1/10 scale so much as it has to do with amp draw. The real metric is how many amps the servo is asking vs how many can the ESC provide. I tried to look up the stock ESC but cant find any specs listed, I guess you'll be swapping ESC's to go brushless soon enough anyway. You say its not browning out now but after you install your new motor you might check for that again. Its possible the new motor may draw enough to cause it. Last edited by HumboldtEF; 11-12-2020 at 04:01 PM. |
11-12-2020, 05:42 PM | #3 | |
Newbie Join Date: Feb 2013 Location: San Antonio
Posts: 4
| Re: Do I need a bec to run a 1/10 servo? Quote:
https://www.ebay.com/itm/RACERSTAR-1....m46890.l49292 Last edited by Sabunimwil; 11-12-2020 at 05:52 PM. | |
11-12-2020, 05:51 PM | #4 |
Newbie Join Date: Feb 2013 Location: San Antonio
Posts: 4
| Re: Do I need a bec to run a 1/10 servo?
Which would do better in this mrc, a 4500kv or 4000kv motor? I'm still learning about them. Both are 35amp. Here's the 4000kv one: https://www.ebay.com/itm/1-18-BRUSHL....m46890.l49292 |
11-13-2020, 11:58 AM | #5 |
RCC Addict Join Date: Jan 2016 Location: Kelowna, BC
Posts: 1,274
| Re: Do I need a bec to run a 1/10 servo?
Yowza, those are both extremely high Kv. In my rigs (trail truck/crawlers scx style rigs) I won't run anything higher than 3000, I try to stick to the 1400-2700 range. I don't exactly how that reflects through an MRC as I've never owned one but it's just something for you to consider. I suppose one advantage of high kv is that your gear your pinion & spur waaaaay down which probably helps to reduce the cogging in an unsensored system. Also, be careful with using esc's that aren't crawler specific, a lot of them don't have a drag brake and that's a non-negotiable must-have for me. As far as the bec and whether or not to run, it's already been touched on but I'll try and explain a little further for you. The need for a bec has very little (nothing?) to do with what type of batteries you use, it's purely related to the amount Amperage your servo wants and what your ESC can provide. Most ESC's are rated at 1-3Amps and many servos will draw up to 5Amps or more. If you're not getting brown outs right now, that's great, it pretty much indicates that your servo/esc are working well together. A bec will almost always provide increased performance because it has more Amps available but quite often you don't see the benefit's until you're trying to do stuff that's hard on the system - like wiggling the tires L-R to try get out of a tight crack. |
11-13-2020, 12:57 PM | #6 |
I wanna be Dave Join Date: Jun 2017 Location: Humboldt county
Posts: 4,482
| Re: Do I need a bec to run a 1/10 servo?
Yeah that KV is way higher than I would consider for a crawler. I stick to 1800 -3000 KV for a crawler. If you want an easer time browsing for crawler specific parts try RPP or Amain. I wonder if the HH revolver 380 would be a good fit for the MRC? |
11-13-2020, 01:48 PM | #7 |
Newbie Join Date: Feb 2013 Location: San Antonio
Posts: 4
| Re: Do I need a bec to run a 1/10 servo?
I ended up buying a 3000kv motor with a 35amp esc that's programmable. Finding a 380/370 motor for crawling is tough. It's slim pickings. I got it for under $50 so if it doesn't work well I'm not out much. I appreciate everyone's opinions and knowledge. I have a losi nightcrawler that I've added a bunch to but parts are readily available for it. Not so much for the mrc. |
11-13-2020, 06:39 PM | #8 | |
RCC Addict Join Date: May 2009 Location: In the warmth!
Posts: 1,163
| Re: Do I need a bec to run a 1/10 servo? Quote:
smooth with more than enough power & torque. | |
11-13-2020, 08:10 PM | #9 |
I wanna be Dave Join Date: Jun 2017 Location: Humboldt county
Posts: 4,482
| Re: Do I need a bec to run a 1/10 servo? |
11-13-2020, 08:55 PM | #10 |
RCC Addict Join Date: May 2009 Location: In the warmth!
Posts: 1,163
| Re: Do I need a bec to run a 1/10 servo? |
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