hitec throttle/brake servo

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hitec

so you don't recommend on using them but considering that the 965mg tiny less torque but significant faster servo just need something for my 2WD MT project don't really wanna spend significant amount of money a local individual is selling relatively cheap
 
the instructions ive seen say you need a minimum of 8kg/cm torque for brakes, that converts to 111oz/in. either of the servos you listed should get the job done, however consider a 5645, its a digital version of a 645 with 164oz/in and .18 transit time.

i myself have some standard servos on the throttle/brake and brake duties on my touring car, they are both around 70oz/in. the rears, its got enough to lock the wheels up, the front is a bit under powered, however will stop the car. on an mt, things will be a bit different, you will need some more servo power to get the big tires to stop.
 
If you really want to get grunt enough to spare, consider HobgbyCity's BMS 860Dmax digital servo
http://www.hobbyking.com/hobbycity/...pion_Digital_Servo_(MG)_18.8kg_/_.18sec_/_54g
This has 322oz/in of torque (!!!) and .18 sec transit time. cost is $US59.79. Performance is almost identical to the Hitec955 which costs around $US100.

You could also use this for your steering as well, or
http://www.hobbyking.com/hobbycity/...ale_Digital_Servo_(MG)_22.3kg_/_.16sec_/_110g at $US49.29, or
http://www.hobbyking.com/hobbycity/...DMG_Digital_Servo_(MG)_19.8kg_/_.15sec_/_102g at $US24.79
 
5645 from great hobbies will do the trick nicely. I've used these from many of my LS's. Shop around but I think their prices are pretty good.
 
For the minimal difference I would stick with the 645mg until it dies unless you are going for something extreme like tonyscott suggests :cool2:
For bashing I don't think you will notice any difference between the 1s you mentioned :blush:
 
Also, what kind of car are you running? The reason i ask is because my MCD seems to require allot less torque than my HPI baja. On the MCD the stock brakes lock up with very minimal input. The HPI baja stock brakes were pretty bad until i upgraded to the Turtle brake upgrade.


Chris
 
hi im using a savox 20kg servo its running my tps rear layshaft hydro brake plus the throttle and front cable brakes works fine not had any problems its @£60 but has got titanium gears so should last well it locks all four wheels up on my marder on and off road no problem would recomend highly but listen to everyone on here as everybody has there own choice some will use seperate servo for front as will i when i get the tps front hydros as well when funds allow
 
<copied over from my other thread where I was too dumbass to notice you were already discussing this>

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i've just got myself some cable discs for my FG Baja, but am supprised at how hard it its to pull the cables once installed (takes very little effort to activate brake with a straight cable). I have yet to grease up the cables and trim the sheath properly to length, but figure that I will still need some serious power to apply the brakes effectively.

I'm going to run a servo just for the front cable brakes, and keep the existing HiTec 645MG on throttle / standard rear disc

At 6v, the HiTec 645MG (ultra-torque) will do 9.6kgcm, is this enough? or do I realy need to spend more money and get something like a 15 or 20kgcm servo?

p.s. I only bash
 
BrawnFG said:
<copied over from my other thread where I was too dumbass to notice you were already discussing this>

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i've just got myself some cable discs for my FG Baja, but am supprised at how hard it its to pull the cables once installed (takes very little effort to activate brake with a straight cable). I have yet to grease up the cables and trim the sheath properly to length, but figure that I will still need some serious power to apply the brakes effectively.

I'm going to run a servo just for the front cable brakes, and keep the existing HiTec 645MG on throttle / standard rear disc

At 6v, the HiTec 645MG (ultra-torque) will do 9.6kgcm, is this enough? or do I realy need to spend more money and get something like a 15 or 20kgcm servo?

p.s. I only bash
Click to expand...

7-8kgs will do it so the hitec is ok. Thats what I run for mine & they work well once they are set up properly :cool2:

http://www.fg-modellsport-gmbh.de/_PDF-ANLEITUNGEN/A.06250-02.pdf
 
yeah but

645MG & 9.6kgcm = £30
?? & 20+kgcm = £60 to £150

no point splashing the cash if the cheep one will do the job, then again, no point wasting £30 on a servo that isn't up to it.

If a 20kgcm one will do a rear hydro and front cable (renbar), is it an eaven force split between the two linkages, i.e. a cheap 10kgcm each end will do the job?


edit: thanks dwarfy, that manual answers my question. I either need to type faster or press refresh more often...
Interstingly my made-in-china brake are identical to the official FG ones :)
 
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Bigger the Better said:
Get the highest torque you can afford. Torque is your friend when it comes to brakes...;)
Click to expand...

Ya, your right.. I read the instructions
minimum regulating power of 7-8 kg
Click to expand...
I think the highest you could get would be best just like you said.



Oh, I said that. :lol: :clown: j/k

You will NOT be disappointed in an expensive higher torque servo for your brakes. I run this servo http://www.hitecrcd.com/servos/show?name=HS-5645MG and will be swapping it out for my MT disk brakes because it is not strong enough. I have heard others locking there front disks on there MT's and didn't believe it could happen until I bought a real nice servo for my Baja. I can now lock up my baja rear tires on road and off with 300oz/in.:D
 
I think that something we often forget is that the actual pull force of a servo is torque divided by disatance from the shaft to the linkage. so the closer to the shaft your linkage is, the more pull you get.

I'm agout to moddify my Ansman alloy horns with another hole to get a bit more pull from them, it will also give the servo more throw which should reduce the strain on the servo..

p.s. Looking at the 20gkcm savox for £60, it seems perfect for killer brakes. I've already put it on the christmas list, and hinted that it would make an awesome valentines gift......


just found this one, on teh main page it claims it is 20kgcm, but i can't find comfirmation on any other sites. But just £40? I suspect it has plastic gears and wouldn't last too long.
http://www.wheelspinmodels.co.uk/car/item/SCH-GM7952-GM-806MG-Digital-High-Torque-Servo__b846/
 
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Stay away from plastic gears and brakes. They will eventually tear a gear. Same with the steering servos. The only spot for plastic would be a throttle only since there is no real stress to the throttle.
 
apart from the radio plate not being the correct size (can be solved with a dremmel) is there any particular reason why 1/4 scale srvos don't get used on the throttle/brake?
 
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