need good HT servo
09-12-2012, 12:06 PM
#1
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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
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
09-12-2012, 12:28 PM
#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.
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.
09-12-2012, 12:30 PM
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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.
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.
09-19-2012, 11:42 AM
#5
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RE: need good HT servo
ORIGINAL: TheKennyKiller
Is the $25 limit arbitrary or all you can afford?
Is the $25 limit arbitrary or all you can afford?
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?
09-19-2012, 11:45 AM
#6
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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.
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.
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.
09-19-2012, 02:29 PM
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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.
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.
09-19-2012, 04:23 PM
#8
Thread Starter
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.
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.
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
09-19-2012, 04:26 PM
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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.
I have one of these, and while the rating on the site is somewhat inflated, it still outputs ~300oz-in at 7.4V.
09-19-2012, 04:30 PM
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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.
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.
09-19-2012, 04:47 PM
#11
Thread Starter
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?
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?
09-19-2012, 11:22 PM
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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.
'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.
09-20-2012, 03:06 AM
#13
Thread Starter
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.
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.
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.
09-20-2012, 03:19 AM
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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
Here, check it out...
https://www.google.co.uk/search?q=co...DOOj0QWMmoDgDg
