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08-24-2011, 06:32 AM | #1 |
Pebble Pounder Join Date: Jan 2009 Location: PCB, FL
Posts: 107
| Brushed and Brushless on the same tranny
I was thinkin' about mounting a brushed and a brushless motor to my ax-10 using one of those dual motor mounts. The idea is to have a two speed truck. Use the brushed motor for crawlin and switch to brushless for speed. Has this been done before? Also, I'm not sure what the best way to switch power between the two motors would be. Any input would be appreciated. |
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08-24-2011, 07:08 AM | #2 |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
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So many reasons why that is a bad idea, or at least one that isn't worth working out all of the issues. It'd be simpler to use a 2 speed transmission, a good motor, and a 3 or 4s pack. |
08-24-2011, 07:45 AM | #3 |
RCC Addict Join Date: Dec 2008 Location: Sonora, CA
Posts: 1,664
| Agreed, having a second motor (Brushed) at idle would create additional drag on the brushless motor. That is just one issue and my $0.02.
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08-24-2011, 09:27 AM | #4 |
I wanna be Dave Join Date: Apr 2007 Location: Arlington, Washington
Posts: 2,303
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Easiest way would be to have two speed controls..........use a futaba 4pk and set up a mix basically that turned off one..... The big problem you are gonna have though, besides all the mounting issues is that whichever motor is not being used is going to end up acting as a generator.......that created power is gonna end up back in the ESC......not sure how all speedos would handle that. I've thought of similar ideas, but just lots off issues to make it worth while. Instead of a 2speed tranny, you could get a high end racing speed control, and program the timing boost to accomplish nearly the same thing. Before it was banned in spec class racing, guys were turning lap times in stock with 17.5t as quick as guys running mod. Later EddieO |
08-24-2011, 10:40 AM | #5 |
Pebble Pounder Join Date: Sep 2009 Location: Canada
Posts: 156
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RC4WD makes a two speed tranny you might want to take a look at.
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08-24-2011, 12:02 PM | #6 |
Pebble Pounder Join Date: Jan 2009 Location: PCB, FL
Posts: 107
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Thanks for the info everyone. It makes sense that if something hasn't been done before, there is probably a good reason why.
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08-24-2011, 01:02 PM | #7 |
Shelf queen Join Date: Aug 2008 Location: Internet
Posts: 5,857
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That's it. i've decided to go 4 speed. How you aski? I'm gonna front mount a Summit 2 speed, and run a rc4wd 2 speed R2 as a "transfer case. Dual hitec 7980's running off of 14V will ensure smooth shift engagement. 10,000KV on 6S should get it going. It'll be top & nose heavy like a real truck, and have a transfer case for scale realism. |
08-24-2011, 06:09 PM | #8 | |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
| Quote:
Wasn't it Novak that had regenerative braking in one of their esc's? | |
08-25-2011, 10:43 AM | #9 | |
Shelf queen Join Date: Aug 2008 Location: Internet
Posts: 5,857
| Quote:
I thinkpst current esc's have regenerative braking now. Then again, with lipos being the norm, idk how it works. But, what Eddie O says is true. Take an moa rig using a punk dig. When yhe rig is off, and you turn one of the axles fast enough, it'll generate enough juice to spin the other axle. I.E. Spin the front fast and the rear will spin. NOT spin yhe left a d the right will spin (although it will, it doesn't prove the point.... Dicks) Last edited by TSK; 08-25-2011 at 01:42 PM. Reason: Because Duuuuuude is a 3rd gen frog spiner =) | |
08-25-2011, 11:34 AM | #10 |
I wanna be Dave Join Date: Apr 2007 Location: Arlington, Washington
Posts: 2,303
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Many speedos have regenerative braking, but yer talking a moderate amount of power being created during the braking action versus say a 17.5 brushless spinning at say full throttle making easily 125+ watts of power......not sure how any speedo would take that type of reverse input constantly..... Later EddieO |
08-25-2011, 11:37 AM | #11 |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
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08-25-2011, 11:41 AM | #12 | |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
| Quote:
I'm a third generation frog spiner and I can tell you I've never seen one spin its rear, no matter how fast you do it. I call bullocks on that one... | |
08-25-2011, 01:35 PM | #13 | |
Shelf queen Join Date: Aug 2008 Location: Internet
Posts: 5,857
| Quote:
I know! Use a R2 dual dig trans as a transfer case to the actual trans. The motors will drive the front/rear output shaft, and the main input would be the outdrive to the secondary (main) transmission. Then you us that to drive my 4 speed setup and voila, we have an 8 speed setup. Last edited by TSK; 08-25-2011 at 01:46 PM. | |
07-26-2012, 01:42 AM | #14 | |
Newbie Join Date: Nov 2011 Location: loveland colorado
Posts: 6
| Re: Brushed and Brushless on the same tranny Quote:
I do not post a lot. Duuuuuuuude you are right IT can be done but you will have more money doing it. Get a 2 speed transmission, a good motor, and a 3 or 4s pack. If you have your hart set on it pm me and i can help you set it up. | |
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