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Thread: Few Questions

  1. #1
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    Few Questions

    sorry, i posted this in the reg e-revo thread, but i ment to post it here, sorry

    On the MMM will 2 11.1V, 5000mAh, 3S1P, 15C lipos wired in series making 22.2V, 5000mAh, 6S1P, 15C puff both lipos due to low C?

    On a single VXL will a 11.1V, 5000mAh, 3S1P, 15C lipos puff the lipos due to low C? if not, what will get hot, esc or motor?
    :-p:-p:-p:-p:-p:-p:-p:-p:-p:-p

  2. #2
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    I would be very careful about using any 15c rated packs in any brushless config. Gear low and with any luck due to the higher voltage (22.2) the packs will last you a while. Again if at all possible get something 20c or higher, 28c+ is ideal iMO I'd say even on the single vxl in a 3s config 15c is pushing the lower limit, keep it geared low and watch temps.

  3. #3
    RC Turnbuckle Jr. asheck's Avatar
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    For both, gearing would be the key.IMO the 15c for the E-revo is much more on the edge of just say no.The mmm can be a serious amp hog,even when geared conservatively.But geared maybe ,15/68, they should do ok.
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  4. #4
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    ok, so would a single vxl, 3s 15c lipo geared stock spur with a 15t pinon be good?
    or still uneasy?
    im selling my alum dt for $ for a mmm
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  5. #5
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    I have been running 15c packs from True RC, and they don't even get warm. I was geared stock (18/65) and now I run 18/58 with no issues. The helpful part for me is that they are 8000mah packs. If you are going to go that low for c rating, they better be offset by a high mah rating.
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  6. #6
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    Quote Originally Posted by Chachi_RC
    they better be offset by a high mah rating.
    care to explain? sorry havent played with my big toyz in a while
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  7. #7
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    Quote Originally Posted by hockeyplaya20@c
    care to explain? sorry havent played with my big toyz in a while
    the motor will want to draw amps. If the C rating is 15 and the mah is 8000, then the batteries are capable of 120A (8000 X 15 / 1000)

    If the batteries are rated at 15c and 5000mah then the batteries are capable of 75A.

    The mmm/neu combo is capable of bursts in the 120a mark.


    So the c rating of 15 is ok with 8000 mah batteries, but may do some damage to 5000 mah ones.


    FYI -- This is the cliff-notes version of the explination. There is more to it, but the bottom line is that you want to buy batteries capable of the highest possible amp rating you can afford.
    be nice.

  8. #8
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    An 8000mah pack at 15C is good for 120 amps constant whereas a 5000mah 15C pack is only good for 75 amps constant. Big difference.

  9. #9
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    I see Hoov was typing at the same time

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    Quote Originally Posted by skeppley
    I see Hoov was typing at the same time
    ahaha, so can i run 2 3s 5000mah 15c lipos wired in the unslow harness, and instead of plugging it into 2 vxl escs, i only plug one plug into the esc and leave the other plug alone?
    making 3s 10,000 mah 15c
    Last edited by hockeyplaya20@c; 03-22-2009 at 10:36 PM.
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  11. #11
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    so i would have 150 amps, right?
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  12. #12
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    Quote Originally Posted by HoovHartid
    the motor will want to draw amps. If the C rating is 15 and the mah is 8000, then the batteries are capable of 120A (8000 X 15 / 1000)

    If the batteries are rated at 15c and 5000mah then the batteries are capable of 75A.

    The mmm/neu combo is capable of bursts in the 120a mark.

    FYI -- This is the cliff-notes version of the explination. There is more to it, but the bottom line is that you want to buy batteries capable of the highest possible amp rating you can afford.
    One consideration is the burst of the pack vs. the constant C rating. A 75C pack can sustain 75C but burst to 120-150A (depending on the pack).

    The Castle New can maintain 1500W continuous and 2700W in a burst so using batteries providing 75A at 6S is running a little close but not significantly underwater.

    I actually run a pair of TrueRC 11.1V 5000mah 15C packs in my MMM & Neu system and they actually perform quite well but I can get a little more speed out of my Thunder Power 11.1V 5000mah 25C packs so it does make a difference but unless you are constantly accelerating or at full speed your entire run you should do fine.

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    Quote Originally Posted by padrino
    One consideration is the burst of the pack vs. the constant C rating. A 75C pack can sustain 75C but burst to 120-150A (depending on the pack).

    The Castle New can maintain 1500W continuous and 2700W in a burst so using batteries providing 75A at 6S is running a little close but not significantly underwater.

    I actually run a pair of TrueRC 11.1V 5000mah 15C packs in my MMM & Neu system and they actually perform quite well but I can get a little more speed out of my Thunder Power 11.1V 5000mah 25C packs so it does make a difference but unless you are constantly accelerating or at full speed your entire run you should do fine.
    man u guyz are smart... lol

    but it still doesnt awnser my other q,

    can i run 2 3s 5000mah 15c lipos wired in the unslow harness, and instead of plugging it into 2 vxl escs, i only plug one plug into the esc and leave the other plug alone?
    making 3s 10,000 mah 15c
    Last edited by hockeyplaya20@c; 03-22-2009 at 10:36 PM.
    :-p:-p:-p:-p:-p:-p:-p:-p:-p:-p

  14. #14
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    I dont think running a single vxl is a good idea for a truck this size. IMO youve gone from underpowered lipos, to an all around underpowered system.

    Dont get me wrong, the vxl is a great ESC.....just not for the e-revo IMO.

    If you have an MMM and a vxl system, I suggest selling the vxl and using the money towards getting batteries with a higher amp rating.
    be nice.

  15. #15
    RC Turnbuckle Jr. asheck's Avatar
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    can i run 2 3s 5000mah 15c lipos wired in the unslow harness, and instead of plugging it into 2 vxl escs, i only plug one plug into the esc and leave the other plug alone?
    making 3s 10,000 mah 15c
    The unslow harness is not needed to produce running your batteries in parallel.Just run the 2 with a parallel adapter and you'll have your 10000 15c pack.
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  16. #16
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    Quote Originally Posted by asheck
    The unslow harness is not needed to produce running your batteries in parallel.Just run the 2 with a parallel adapter and you'll have your 10000 15c pack.
    well i don't have the supplies, $, and time to do that, so can i use a regular unslow harness and plug 2 batts in, then into the esc, leaving the extra plug for the 2nd esc move freely not pluged into anything?
    I used to run dual vxls
    but one fried on me, thus going MMM
    ill probably only run the truck 1ce to have some fun
    am i better off with a 15t pinon?
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  17. #17
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    Quote Originally Posted by hockeyplaya20@c
    well i don't have the supplies, $, and time to do that, so can i use a regular unslow harness and plug 2 batts in, then into the esc, leaving the extra plug for the 2nd esc move freely not pluged into anything?
    I used to run dual vxls
    but one fried on me, thus going MMM
    ill probably only run the truck 1ce to have some fun
    am i better off with a 15t pinon?
    any1? i wanna get my truck runnin ASAP today
    :-p:-p:-p:-p:-p:-p:-p:-p:-p:-p

  18. #18
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    anybody!? lol
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  19. #19
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    So what exactly are you running?
    One VXL ESC and One Velineon Motor?

  20. #20
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    Quote Originally Posted by skeppley
    So what exactly are you running?
    One VXL ESC and One Velineon Motor?
    yes
    im saving to buy a MMM
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  21. #21
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    Oh, got it.
    Yes, the unslow wired to 2 packs and one ESC will work.
    Run the smallest pinion that you can get on there.
    It will probably still need small breaks to cool off the ESC, cause it will get hot.

  22. #22
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    YAY! thanks, once i clean my room ill work on the revo!
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  23. #23
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    THANKS GUYS! i just ran my revo, and man what a blast!
    now i cant wait to get the MMM
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