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Thread: twin AC R42 build

  1. #1
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    Default twin AC R42 build

    Hello, I tried to sell these motors and ESC'S with no luck. so I'm going ahead with this build inspired by Shawn ( Sirlash) lol. Converting this from gas build that never got finished. I have 2 neu 1515 1650 KV MOTORS AND 2 Etti speed controls plan on 5s per side. center mounted counter rotating props. and skag struts any input would be appreciated
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  2. #2
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    Eugene

    With 5S per side in that large hull, you may need more then a 120A ESC.

    I run a 36" Avenger twin for racing Oval and Offshore classes
    6S per side
    Trunigy marine 180A-V2's
    TP4050's -1575KV motors
    45mm- props

    https://www.facebook.com/groups/1675...1255439039918/

    Larry
    Last edited by TRUCKPULL; 05-22-2018 at 01:55 PM.
    Past NAMBA- P Mono -1 Mile Race Record holder
    Past NAMBA- P Sport -1 Mile Race Record holder
    Bump & Grind Racing Props -We Like Em Smooth & Wet

  3. #3
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    Haha, I am planning on using my Etti 120’s as well but with a pair of TP 4050 950kv’s on 10s which I’ve had around forever.

    And Gene I have logs stating 190 amps on BlownAway. Mind you those are Castle 1717’s and I think that boat is on the heavy side.
    Last edited by srislash; 05-22-2018 at 03:26 PM.

  4. #4
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    1515,s are way too small. Maybe 1521 per side or best 1527 per side. That’s a big boat. I built one with a 3080 Lehner and one with a 2030 NEU. 70 mph boats. I now run a Top Gun with duel Pletts and a dual Flier 300.


    Sent from my iPhone using Tapatalk

  5. #5
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    Howard is right, the motors are too small with too high a Kv for 5S. The props will be too small for decent efficiency. I raced this hull on 10S with a single Neu 2215 and x462 prop, it needs some power to perform well.


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  6. #6
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    thanks everyone for the advice looks like I'll have to look for some different motors.

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    How about the TP 4070 4Y 1090 KV would that work?

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    I thought you could go up to atleast 1600 kv,s running 6s in oval race trim, so you would think a 1600 kv motor running 5s would be fine.

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    Yeah, that sounds about right and should be just fine in that boat. If you set it up as a twin with each motor running 5s , you're only looking at 29,280 rpm's per motor

  10. #10
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    Geno, what size props are you aiming at? I am running 447’s on BlownAway with the 1717’s(1577kv) on 6s and that gets me 70’ish miles per hour. I am getting 4mins runtime but that is with 8,400-8,800mah per side.
    I would just like to try a lighter setup.

  11. #11
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    I do have a set of 447"s but could get bigger ones also

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    Quote Originally Posted by meangenesracing View Post
    I do have a set of 447"s but could get bigger ones also
    I just ordered a pair of CNC 50mm/2’s in bronze to try on that one. So as soon as they arrive I’ll toss them on and get back to you.

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    Quote Originally Posted by meangenesracing View Post
    How about the TP 4070 4Y 1090 KV would that work?
    For what it's worth, in my dual powered 50" H&M Supercat XL I run the same motors, TP 4070 1090Kv on 8S/side with a X447's and it moves the big hull easily with decent runtime, for more speed I'll run reduced (50mm) X457's and motors easily turn them too. For esc's I'm running MGM 25063's but certainly more esc than is required but the headroom is nice.

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    Quote Originally Posted by Lone-Wolf View Post
    For what it's worth, in my dual powered 50" H&M Supercat XL I run the same motors, TP 4070 1090Kv on 8S/side with a X447's and it moves the big hull easily with decent runtime, for more speed I'll run reduced (50mm) X457's and motors easily turn them too. For esc's I'm running MGM 25063's but certainly more esc than is required but the headroom is nice.
    can you tell me what batteries and how many mah per.
    battery thanks, geno
    Last edited by meangenesracing; 05-25-2018 at 09:14 PM.

  15. #15
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    Quote Originally Posted by meangenesracing View Post
    can you tell me what batteries and how many mah per.
    battery thanks, geno
    I run Revo 70C 5000ma packs.

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    Quote Originally Posted by Lone-Wolf View Post
    I run Revo 70C 5000ma packs.
    Just 1p per side Steve?

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    Quote Originally Posted by Lone-Wolf View Post
    I run Revo 70C 5000ma packs.
    diden't know Revo made 8s packs

  18. #18
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    Quote Originally Posted by srislash View Post
    Just 1p per side Steve?
    Yes 1P/side but should try 2P as the extra weight would really help this hull, I believe you run 2P correct?

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    Quote Originally Posted by meangenesracing View Post
    diden't know Revo made 8s packs
    They don't make 8S packs but of course I use two 4S packs in series.

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    Quote Originally Posted by Lone-Wolf View Post
    They don't make 8S packs but of course I use two 4S packs in series.
    hope I'm not being a pain in the a$$ lol. but one more question what's your run time on 5000 MAH ?

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    Quote Originally Posted by meangenesracing View Post
    hope I'm not being a pain in the a$$ lol. but one more question what's your run time on 5000 MAH ?
    Funny guy!...you are not a pain, that's why we are here so ask all the questions you want, glad to help if I can.

    I always try and keep my actual running in this particular boat to 5 minutes, I am always surprised to check the cells after the run and they are usually about 30% capacity still and that is with the larger X457 props, the X447's I have not accurately tested but the runtime will of course improve. This hull runs very loose on the water, a good thing for speeds and lower amp draw but not the best for overall handling, it likes to turn into an airplane pretty easily. It's quite an old design and I am sure back when it was designed nobody was thinking that anybody would be doing 80+mph with it. If you were to use the exact same setup in your hull the outcome will be different of course, maybe not far off and probably better handling than mine!

    Keep questions coming if you have more :-)

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    ok, I'm thinking that's the direction I'm going with the TP 4070 motors. I've been wanting to try the TP motors. thanks again

  23. #23
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    Quote Originally Posted by Lone-Wolf View Post
    Yes 1P/side but should try 2P as the extra weight would really help this hull, I believe you run 2P correct?
    Yup I run 6s2p per side in BlownAway. Those 1717’s are known ‘amp hogs’ because of their size. They are the size of LMT 2250’s.

    Quote Originally Posted by meangenesracing View Post
    ok, I'm thinking that's the direction I'm going with the TP 4070 motors. I've been wanting to try the TP motors. thanks again
    You won’t be disappointed Geno. My 4050 1020kv’s are on their 5th season of SAW running on 12s. Granted I’m certainly not out there every weekend but I’m impressed.
    If you are going with the 4070’s get 8mm shaft. Just makes for a sturdier motor

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    Quote Originally Posted by srislash View Post
    If you are going with the 4070’s get 8mm shaft. Just makes for a sturdier motor
    Good call Shawn on the 8mm shafts for the 4070 size.

    I too have had nothing but good luck with TP, the 4050's I had in my Cheetah were perfect and rock solid pushing them to their max often, these 40XX series seem very robust and the price can't be beat for quality and value.

  25. #25
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    yup, that's my plan 8mm shafts. thanks for all the help

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    got these in the mail today they should do the trick. 4070 1090 KV
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    NICE! Now you're cooking with gas!

  28. #28
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    got some work done this weekend. motors are a little forward than I would like but had a hard time with stuffing tubes being to short and flex cables with to much binding. I'm sure I can make up for it with battery placement. just waiting on my full hatch to set cog.
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    Quote Originally Posted by meangenesracing View Post
    got some work done this weekend. motors are a little forward than I would like but had a hard time with stuffing tubes being to short and flex cables with to much binding. I'm sure I can make up for it with battery placement. just waiting on my full hatch to set cog.
    Oh I didn’t think of that with the motors on tunnel. Maybe ESC’s over Motors if need be. That hatch is tall for the gas engines.

  30. #30
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    So how far from transom did you get the motors Geno?
    And if it helps progression my hatch weighs 18oz and it’s cg is at 13.5” from the front hatch lip opening.

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