New JR and Hitec HV servos. How to maximize their potential?
 

So JR came out with their new HV $200 servos a few weeks back and now Hitec has been advertising for their HV servos with titanium gears. stats on both servos are astonishing. 480 in/oz torque! anyway, the ads i have seen say that this is only possible with 2s lipo, or 7.4v input. i have also seen ads that say in small print something to the effect of "in order to generate this high output you need to have your system setup accordingly." i am wondering if anyone out there knows how to do this?

i run 1/8 brushless buggies and truggies on 4s or 5s setup with a standard spektrum reciever. can anyone tell me how many volts the spektrum sends to the servo? is it adjustable? would these new 7.4v HV servos be useable with my setup or should i just buy a standard high torque servo that lists the 4.8/6.0v stats? just looking for a better understanding of all this.

IIRC the SpeKtrum receiver is good for 9.6 volts, it's not adjustable just passes through whatever it gets. So you would have to have either a BEC with adjustable voltage, or you could just use a 2s lipo as a receiver battery, which is what those Servos are really meant to go with.

you're better off with a standard voltage servo in a buggy, plenty of torque and speed. the spektrum passes whatever voltage is input, so the output is dependent on your bec setting.

these high volt servos are aimed at rock crawlers where stalled turning can pull serious amps.

to feed high voltage servos, you either pull the red and black wires and still plug the white(signal) wire into the receiver. then wire the red and black to either a 2s lipo or a dedicated bec for your servo

so if i just plug this servo into my spektrum rx without doing anything else is it going to run at the 4.8v or 6.0v?

http://www.amainhobbies.com/product_...ducts_id/18804

The rec does not provide the power. What speed control are you using? Or do you have an external bec like the ccbec?

just using a MMM. although thinking of picking up a RX8 if i can find one in stock anywhere. i do have a CCBEC but i havent ever used it for anything and would rather not if it isnt needed.

The MMM will provide 6v to the Rx and operate that servo quite nicely. If not, disable the BEC from the MMM and setup the CC BEC.

In my opinion, a good servo rated for 200in/oz is all you need in a buggy, as long as it is a fast servo as well.

does the new tekin push 6.0v also?

i agree about the buggy only needing aobut 200 in/oz. but i run that on my truggy right now and it has been fine 90% of the time but i have noticed some give in high grip, fast turns so i want to go with something that is about 300 in/oz or higher. anyway, thanks for the info.

Hitec 7955tg! 333oz of torque at 6V, works incredible on my RC8T, never thought a servo could be worth that much money till I actually tried one.

If you want to run it at the 7.4V buy a CCBEC and hook up it's output to the servo power leads only, then use the castle link to set the output to 7.4V. That way your servo sees 7.4 and the rest of the system runs off of the MMM BEC. You would only plug the servo's signal lead into the RX.

The HV servos were designed for plane users. The 33% and larger planes often employ multiple servos on one control surface, and powering them was providing quite a challenge. With these servos they can just use a big 2s lipo, instead of having to use nimhs, or some sort of super high output regulator to drop the lipo voltage down to 6v... I have seen these planes, 12-14 of the 333oz/in hitecs or 8711 jr servos... That is some big money there!!!

i know the 8711 is for planes/helis but actually JR says their new 9100 HVT and HVS is made for 1/8 and 1/5 surface applications. i actually just picked up a couple of JR 9100t's from amain. they have them on sale at $119. cant beat that.(normally $139) i figure this will be the best all around servo for me. to date all i have used is the JR 9100s for both steering and brake but i sold off a couple of the 9100s's and replaced with the higher torque 9100t.

but now i have a much better understanding of how to control voltage output from the esc. thanks guys.

This might sound wierd but I actually think these servos are geared more towards the nitros. They all want to run a small 2 cell lipo Rx pack and not have to deal with a regulator. Personally I think they seem like a bit of overkill, but eliminating the regulator is a bonus.


Yes, the tekin is also 6v.

I only run 200oz servo in my buggy. I cant tell a difference between it and a 400 oz servo. 200 is plenty IMO. I have even run a 150oz servo in my buggy without any issues.

Yep. thats the servo I use in the truggy too. killer servo that will do anything you need.

Aannnyythingggg??? :whistle: :mdr: