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  1. #1
    nitrosportsandrunner's Avatar
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    need good HT servo

    I need a good high torque servo for my 1/8 (soon to be 1/5) MOA crawler.

    I posted here cause the crawler section doesnt get alot of traffic.

    I currently have a MG996R servo. It struggles at times, and if the tires are against a rock then forget it.

    that servo has 10kg torque (around 200 oz i think)

    I figure I need 300-400 oz.

    Now, does anyone know of a $25 or under servo that can put out that kinda power? I know there are servos with that kinda torque if I was willing to spend alot of money....but im not willing...lol

    SC10rs, 1/6 hummer crawler, Kyosho Twin Force, Lunchbox project, Techone P51,

  2. #2

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    RE: need good HT servo

    For something very strong, and relatively cheap, I would suggest this

    http://www.servocity.com/html/hs-5995tg_servo.html

    Youll end up choking it down a lot with your EPA from the stock 180 degree rotation, but its wickedly strong, and at that price cant be beat. I have one in each of my 8th scale buggies.
    Kyosho Inferno Neo Race Spec, and Inferno Ve Race Spec.

  3. #3
    Community Moderators Foxy's Avatar
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    RE: need good HT servo

    You are going to spend more than 25 bucks on just the BEC you will need to run a 400oz-in servo. What you ask is completely impossible.

    If I were you nitrosports, I'd try to find a way to make a large scale servo fit. The HS805BB for example, but you're still gonna need a BEC for a servo that strong in a crawler.
    Down with the crew known to pump up the bass...
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  4. #4

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    RE: need good HT servo

    Is the $25 limit arbitrary or all you can afford?

  5. #5
    nitrosportsandrunner's Avatar
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    RE: need good HT servo


    ORIGINAL: TheKennyKiller

    Is the $25 limit arbitrary or all you can afford?
    as is often the case, most of my builds are limited by funds.
    at the moment, I have mulitple credit cards which are way behind, winter coming and fuel I need to buy...ect.

    If money were not an issue, i could build some really sweet stuff. I buy some good metal working tools as well...lol.


    If I use a standard "AA" battery pack to power the Rx (or a 2s lipo rx pack) and pull the red wire off of the ESC's plug...then that should insure that my current servo gets max voltage all the time, right?
    SC10rs, 1/6 hummer crawler, Kyosho Twin Force, Lunchbox project, Techone P51,

  6. #6
    nitrosportsandrunner's Avatar
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    RE: need good HT servo


    ORIGINAL: Foxy

    You are going to spend more than 25 bucks on just the BEC you will need to run a 400oz-in servo. What you ask is completely impossible.

    If I were you nitrosports, I'd try to find a way to make a large scale servo fit. The HS805BB for example, but you're still gonna need a BEC for a servo that strong in a crawler.
    that would be sweet.
    but a decent 1/5 servo is well over $50, correct?

    If I run a 2s lipo pack to power the rx, and remove the red wire on the esc plug, then that should keep the servo's power at max no matter what the esc does.
    SC10rs, 1/6 hummer crawler, Kyosho Twin Force, Lunchbox project, Techone P51,

  7. #7
    Community Moderators Foxy's Avatar
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    RE: need good HT servo

    4 aa batteries, even 1.5v alkalines, will not be able to deliver the current required to turn a servo of that kind of strength in a crawler. If it were a regular car i'd say try it, but butting up against rocks, no way. Also with a direct connection without a bec you run the risk of burning the servo on burst draw. The lipo will power it fine but increase further the risk of overvoltage and overdraw.

    You can get an 805bb on ebay for 30 bucks sometimes, i think it would be your most economical option if you can be bothered to make it fit.
    Down with the crew known to pump up the bass...
    We rock the joint at a cool, steady pace.
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  8. #8
    nitrosportsandrunner's Avatar
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    RE: need good HT servo


    ORIGINAL: Foxy

    4 aa batteries, even 1.5v alkalines, will not be able to deliver the current required to turn a servo of that kind of strength in a crawler. If it were a regular car i'd say try it, but butting up against rocks, no way. Also with a direct connection without a bec you run the risk of burning the servo on burst draw. The lipo will power it fine but increase further the risk of overvoltage and overdraw.

    You can get an 805bb on ebay for 30 bucks sometimes, i think it would be your most economical option if you can be bothered to make it fit.
    ill keep that one in mind. found it on ebay for $33 shipped, and ships from usa.

    If I can make a 1/8 crawler into a 1/5, I atta be able to make a servo mount for that servo.

    I just finished the new chassis (for the most part)
    I just have to make a battery mount, and body mounts. And possible a front bumper to protect the body.
    Here is a pic of the early mock up
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    SC10rs, 1/6 hummer crawler, Kyosho Twin Force, Lunchbox project, Techone P51,

  9. #9
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    RE: need good HT servo

    http://www.hobbypartz.com/33p-solarservo-d772.html

    I have one of these, and while the rating on the site is somewhat inflated, it still outputs ~300oz-in at 7.4V.
    \"Politicians and diapers are both full of crap and should be changed regularly\"

  10. #10

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    RE: need good HT servo


    ORIGINAL: HPI_Savage_RC

    http://www.hobbypartz.com/33p-solarservo-d772.html

    I have one of these, and while the rating on the site is somewhat inflated, it still outputs ~300oz-in at 7.4V.
    I have one in my Exo and it is a decent servo just on the slow side. I think it really puts out more like 250oz at 6v, but for $18 it's a good deal I guess.
    - Hobby Shop Employee
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  11. #11
    nitrosportsandrunner's Avatar
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    RE: need good HT servo

    Ok, now i need a quick lesson in figures...lol

    the figure on my mg996r servo is 10kg (stall torque)

    how does that relate to oz? I thought my servo was around 200oz but maybe its more?
    SC10rs, 1/6 hummer crawler, Kyosho Twin Force, Lunchbox project, Techone P51,

  12. #12
    Community Moderators Foxy's Avatar
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    RE: need good HT servo

    Simply go to google and type carefully...

    'convert 200 ounce inches to kilogram centimeters'

    It'll give you the answer right away, but you ned to write it out exactly how google wants you to, usually with the long descriptions of the units (inches instead of 'in' for example). Works for almost any conversion you can imagine. 200oz-in is 15kg-cm.

    Also, stall torque is usually less than holding torque.
    Down with the crew known to pump up the bass...
    We rock the joint at a cool, steady pace.
    Foxy
    RCU Community Moderator

  13. #13
    nitrosportsandrunner's Avatar
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    RE: need good HT servo


    ORIGINAL: Foxy

    Simply go to google and type carefully...

    'convert 200 ounce inches to kilogram centimeters'

    It'll give you the answer right away, but you ned to write it out exactly how google wants you to, usually with the long descriptions of the units (inches instead of 'in' for example). Works for almost any conversion you can imagine. 200oz-in is 15kg-cm.

    Also, stall torque is usually less than holding torque.
    yeh, i posted the Q cause a google search gave me a few different answers...lol.

    but one i found said to multiply the KG by 13.8. That would make my servos around 138...and as you say foxy a 15kg servo would be 200ish.

    So the 300+oz servo mentioned above is probly worth a shot. I could have sworn at some point I found that the MG996r was 200oz. Its certainly much better than any RTR servo (not that thats a huge feat)

    Ill pick up the one mentioned above when I can. Thanx guys.
    SC10rs, 1/6 hummer crawler, Kyosho Twin Force, Lunchbox project, Techone P51,

  14. #14
    Community Moderators Foxy's Avatar
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    RE: need good HT servo

    Yeh I'm not talking about a google search. Google actually has a converter, you don't need to follow any links. Just type the conversion you want, and it gives you the answer directly, no need to guess which site is accurate or to try to remember how many to multiply by. But as I said you do need to type accurately exactly what you are asking.

    Here, check it out...

    https://www.google.co.uk/search?q=co...DOOj0QWMmoDgDg
    Down with the crew known to pump up the bass...
    We rock the joint at a cool, steady pace.
    Foxy
    RCU Community Moderator


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