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Old 01-13-2007, 10:31 AM   #1
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Default Would this be a good surface steering servo?

Hello!
JR has a new servo, but it's listed as for an Air application. Wouldn't this be a good surface steering servo for a 1/8 scale nitro buggy? Check out the torque!

http://www.horizonhobby.com/Products...rodID=JRPS8711

Maybe I'm way off... Your thoughts?
Thanks!
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Old 01-13-2007, 10:47 AM   #2
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Looks like it would be a great servo! A little pricey at 140.00 (IMO) But its new..

I've been using Hitec 5995TG (Very similar to that one in performance) with great success, in both the S & T in my 8ight with zero problems. If you shop around you can find them for $94.00 + shipping.... (FYI)

http://66.221.209.115/html/hsr-5995tg_ultra_torque.html
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Old 01-13-2007, 11:14 AM   #3
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Thank you for the reply! That sounds like a really nice one too... Looks like it was designed for robots, that's cool it works good in buggies too.

Do you run it at 6.0V? I'm getting back into Nitro after being out of it for 10 years. How do I know if I'm running at 4.8, 6.0, or 7.4 volts?
Thanks...
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Old 01-13-2007, 05:47 PM   #4
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400oz at 6V seems excessive. I used a Futaba 9351 192oz at 6V for steering and a Futaba 3305 for throttle.

The last receiver pack I owned was a 6V Team Orion stick style. I'm not sure if lipo receiver packs put out more voltage or not tho. I've heard of people using AA batteries in their receiver packs for more mAh bu I don't know what the voltage is on those.
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Old 01-13-2007, 05:50 PM   #5
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It looks like a good servo. I use the Airtronics 361 servo on my buggy.
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Old 01-13-2007, 08:03 PM   #6
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Excessive or not, I'm thinking the more torque the better, right? As long as you have servo gears that can handle that torque. For things such as holding power, around corners or controlling landings after a bad line off of a jump, etc...

The specs on the HSR-5995TG show the following:

Stall Torque (6.0V): 333.29oz/in. (24kg.cm)
Stall Torque (7.4V): 416.61oz/in. (30kg.cm)
Standing Torque (6.0V): 433.27oz/in. (31.2kg.cm) 5 degree deflection
Standing Torque (7.4V): 541.59oz/in. (39kg.cm) 5 degree deflection

My question is what does stall versus standing mean when used with a buggie? I'm trying to compare apples to apples and the JR DS8711 specs are:

Torque: 403 oz/in @ 6v, 347 oz/in @ 4.8v

But the JR mentions nothing of stall or standing so I don't know what I'm comparing here...
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Old 01-14-2007, 04:46 AM   #7
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i used to run robot servos with huge amounts of torque. i also ran them because i could run unregulated lipo rx pack. if you run standard servos with lipo you need to run a regualtor because 2 cell lipo output is 7.4 volts.

standard "AA" is 1.2v per cell same as standard nihm rx pack.

you do NOT need that much torque in a buggy. i run JR9000S which has 128oz and is MORE than plenty for my 1/8th. go for speed not torque in steering unless you are running a truggy/mt.

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Old 01-14-2007, 04:47 AM   #8
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and btw the robot servos were 180 degree servos. so if you get one be sure to turn your epa l/r way down or have someone reprogram it to 60 degree.

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