Zeeb

My Feedback: (41)

I beg to differ;

"I am a Service Representative for Hitec RCD USA, Inc. and we have extensively tested the HS-7955TG servo at direct 2S LiPo voltages and have found that it works absolutely beautiful. You should have no issues running all the way up to 8.4v (full charged 2S LiPo), the only thing is you may notice the Minimal Load Jitter that some of our 7XXX series servos will show, though this is a non issue- once you take to the air and there is air pressure on the control surface, the jitter will go away entirely.

I run HS-7955TG's on the ailerons and elevators of my personal 35% Pilot Yak 54 on unregulated 2S Fromeco LiIon (8.4v fully charged). I fly this aircraft numerous times every weekend and the servos are several years old, not once have they given me any sort of issue. You will be perfectly fine running them on HV.

Quote:Originally Posted by bryansifsof44
Hitec has said they are fine on HV... They also have the same motor as the 7954 which were released after the 7955s just different gear material. 7954s are HV.
The electronics inside of the 7955 are slightly different than the 7954. They both make similar torque and speed, but not exactly the same inside.
https://www.flyinggiants.com/forums/...postcount=1800

rjpmodel

My Feedback: (2)

I have been running HS-7955TG's in my jets on A123's for years with no problems. I quit using 8411's after I had at least 3 quit on me. I have been told by Hitec on several occasions that they are really HV servos but they do not advertise them as such.

i3dm

My Feedback: (51)

remove the servo, check its travek on a servo tester, look for offsets in motion.
then take it apart and examine whats going on - spline, gears, servo horns etc.

flyinfool1

My Feedback: (2)

One has to wonder, Hitec will tell you that they are fine on 8.4V but will not put it in writing in their advertising or specs.
Does that mean it is marginal at 8.4V?
Or at least one component in there that is not rated for 8.4V?
Or does 8.4V just leave zero safety margin?
You would think that if they truly were 8.4V capable it would be stated in the specs since that would be a selling point.

I am just asking the questions that this thread has raised in my mind since there is contradicting information.

scoeroo

My Feedback: (9)

One would think Hitec would at least change the spec sheet if they are rated for higher voltages .......a service rep is not an electronics repair Eng - big difference in knowledge

FalconWings

My Feedback: (57)

putting my developer hat on.....No, they want you to buy their dedicated HV servo line for HV applications, though their non HV line also worka fine.