Around the carb lip and onto the throttle control lever.

Throttle springs are a life saver they are installed to pull the throttle to idle if the linkage pops off also some airtronic servos go to a neutral setting during batt. power lose and can free wheel thus the spring can pull the servo linkage and throttle closed with out any problem. The best thing to do is enclose all wires and tie them up. enclose them were they can not come loose and if you are running "AA" batteries then wrap a rubber band around them to hold them in the batt. case so they cannot fallout or bounce out. This is JMO. So take it how you well.




Opinions are like Butholes everyone has them

Dan1220, I've got a hyper .21 at home with a TRS on it. It looks alot like the picture of the buggy you're talking about. I'll post a pic of it when I get home tonight....

I had an actual spring for a TRS at one time, but it was too weak to close the carb during power loss to the throttle/brake servo.

I installed the two o-rings and the carb easily snaps shut with loss of power or (when the horn is still intact). I won't ever run without one now.

Of course, I'm still using a failsafe as well. You can never be too careful

-SlingItX

Here's my set-up.....I've got a fail-safe as well

sling and nitro

if you turn off the radio what happens?

if you turn off the rx what happens?

do you think that adds extra stress onto the servo when the carb is open?

I think we should put both side include at brake side, when Rx loss of battery this can push the servo horn to 0 degree and also push the oil thorttle to close...........any idea??

khoo

Kill radio ----> fail-safe returns throttle to idle and sets brakes

Kill Rx ----> TRS closes carb but brakes are not set (it didn't used to close the carb....hmmmmm)

do I think that the TRS adds extra stress onto the servo when the carb is open?

Of course it does, what is in question is whether it's enough to worry about. I just did a few calculations on the set-up I've got.....

With my servo (44.4oz-in.) and horn, the maximum force the servo can put out is 50.7oz = 3.17lb. The force required to overcome the TRS and bring the carb to full throttle is about 1.25lb (this is approximate, I hung a couple of water bottles from it and calculated the weight from the volume of water.....I don't have a scale :disappoin ) Anyway, what this all means is that the servo is working at about 40% of it's maximum capacity when at full throttle to overcome the TRS. Obviously, there's no problem with that, the servo will do fine opening the throttle to WOT......once

The problem, as occurs often, is with fatigue. Even though a part is stresses below it's limit, it may still fail if it is stressed repeatedly. The theory behind fatigue is pretty involved but as an approximation, the maximum repeated stress on the servo should not exceed a value equal to ~80% of it's listed capacity. If you stay under this limit, you should have a pretty long servo life.

In my case, that would be ~2.5lb so I should be okay for a while.....

did I lose everybody with my engineering ranting???

are you an engineer? Im 15, and thats what im looking to be.

Hi all the RC owner, yesterday night I try to put rubber bend at my throttle to return the throttle when the RX battery low volt, RX battery disconnected and the switch hardness off. Is quite safe but 1 question, will this rubber band force and spoil the servo ?? But it seem the servo is quite power, can pull the throttle easyly with the rubber band. Thanks.

khoo

thats debateable some say it puts stress on it some say it doesnt, I think that its fine.

dan1220, are you doing the same thing that what I done?? How long already you doing this?? The servo still OK?? Please advice.

khoo

im carless right now, and no I have never done the "rubberband" but I know people that use orings and they seem to be fine.

Not yet Dan, but I'm working on it. I'll be graduating with my bachelor's degree next June. Engineering is a great field, once you've got the knowledge you can apply it to just about everything. Mechanical engineering especially, becuase everything in this world somehow relies on a mechanical means to operate.

I wish you the best of luck if you choose to pursue engineering. Do you know what field of engineering you'd be interested in?

lol...well mechanical engineering I like cars a whole lot, and my dad told me mechanical engineering would alow me to work with cars.

You know, that's the biggest misconception about mechanical engineering. Many people think that since it has the word "mechanic" in it that it means it's all about cars. While it's true that you can definitely go the automotive route with it, mechanical engineering is much more diverse. Everything around you: mouse, keyboard, desk, the chair you're sitting on.....all required a mechanical engineer to design.

Your dad is totally right though, if you go into mechanical engineering you'll definitely have opportunities to work with cars. One of the major racing teams had their champ car(looks like a small Formula car) at my school yesterday. Talk about engineering. The whole body was carbon-fiber! The control arms for the suspension were shaped like an airfoil (wing) instead of just round tube to reduce drag. Pretty amazing stuff.

O yes, I know all the stuff that a mechanical engineering deals with. THats one of the bigger reasons i like it. I can do tons of different things, but engines are what I am really interested in. Any engine, car, boat, RC, lawn mower, Etc... What school did or do you go to? I would like to go to either the naval academy or perdue.

I go to Cal Poly Pomona in Southern California. I applied at the Academy in Annapolis when I was a senior in high school. I interviewed with my local Representative from Congress and got a referral letter from him.....I passed all of the rigorous physical and medical exams.....ultimately, I was turned down because I wasn't scholastically qualified. I was a little bewildered because I had a good GPA and a pretty high SAT score as well. But it wasn't my decision so I moved on to Cal Poly.

does anyone have a failsafe on a savage? if so where did you mount it?

IF your TRS can close the throttle when the RX is off then your servo will not last as long as it should, also you will drain more from your battery pack. IT indeed does put stress on your servo, anything that the servo has to pull is stress, in this case the servo would be suffering from lots of stress.

How long should a servo last?


Ever heard of one failing due to a TRS?

IT really depends on how much tourque the servo has. A high tourqe servo will last longer then a standard. Have you taken off your trs and then listened to the servo and then put it back on and listened? servos will sound different when they are pulling something hard. unless you are using a really high tourqe servo then you should hear a difference.

I Have A Losi XXX NT I could realy use a fail safe!!! Where would you buy one and what would you recomend? Thanks Bernie

i just bought a new Ofna failsafe for my t-maxx. and i have no clue where it plugs in on the throttle servo.

Plug one end of the failsafe to your rx and the other end for the servo. You can only install one way so its hard to mess it up.