New Failsafe making throttle go crazy?

[HarryNuts]

I just put a New Dynamite failsafe in my buggy. It works but the servo goes crazy. When I hit the throttle sometimes it doesn't just go straight forward. Instaead it like zigzags forward and backward real quickly on its way to WOT. When I took it out everything is back to normal.
They mention that you can't use it with an Airtronics M8 radio. I have a JRXS3 synthesized radio and I'm using a JR Receiver(RS300). I'm also using a hitec HS-5625MG digital servo. Is there some kind of a compatibility problem here?

 

[spill]

Stupid question....

You don't have it plugged into the steering servo by mistake, do you?

 

[AaronBall]

Here some things to check.
Does the fail safe light blink red or orange when you notice the jerky motion?
Do you use rechargable batteries (4 or 5 cell?) or alkalines?

Make sure the fail safe is as far away from the receiver as possible, at least for testing purposes.
Unplug all servos except for the throttle and fail safe.
Test with a standard servo in place of the digital.
Test fail safe on another radio if possible.

I have seen Dynamite fail safes cause interference with the radio under certain circumstances. These tests should help narrow down the problem.

 

[Dbutch]

I don't understand how is the fail safe screwing up your steering. The fail safe should be hooked up to your throttle servo. You said "When I hit the throttle sometimes it doesn't just go straight forward. Instead it like zigzags forward and backward real quickly" well this should not be happening at all. Tell me something when you shut your radio off does the brakes apply, if not you have it hooked up wrong or its broken.

 

[Error401]

Originally posted by HarryNuts
I just put a New Dynamite failsafe in my buggy. It works but the servo goes crazy. When I hit the throttle sometimes it doesn't just go straight forward. Instaead it like zigzags forward and backward real quickly on its way to WOT. When I took it out everything is back to normal.
They mention that you can't use it with an Airtronics M8 radio. I have a JRXS3 synthesized radio and I'm using a JR Receiver(RS300). I'm also using a hitec HS-5625MG digital servo. Is there some kind of a compatibility problem here?

I'm running an XTM FS on the same setup with no problems, but, I had an Ofna micro FS that made the throttle do the same thing yours is doing. I don't know why, but it does, and I removed the Ofna FS and everything works right.

 

[BuckeyeStorm]

I have 2 venom failsafes. I put one in my savage and one in my storm. They both went crazy both throttle and steering. I'm using the JR SR3i. I'm using rechargeable ni-cads although fresh alkalides have given me better servo resonse.
I was really hoping they would work because I have had some major damage from run aways

 

[mattyk6]

I have a Venom Failsafe in my storm. Using a JR XR3 and a 5-cell NiMH receiver pack. Haven't had any problems.

Buckeye - Don't you mean XR3i or XS3? I've never heard of an SR3i.

Matt

 

[BuckeyeStorm]

Originally posted by mattyk6
I have a Venom Failsafe in my storm. Using a JR XR3 and a 5-cell NiMH receiver pack. Haven't had any problems.

Buckeye - Don't you mean XR3i or XS3? I've never heard of an SR3i.

Matt

Matt, your right XR3i. Could you or somebody give me a refresher on setting it up. I bought it used. TIA
BTW, I have 2 storms. The hobbtown mispriced the 2nd one so I got about $100 off:ha:

Todd

 

[HarryNuts]

The fail safe is in the receiver box right smack next to the receiver. The wires are too short to put it outside of the box. A 5 cell pack is positioned right on the outside of the receiver box also. The brakes apply when I turn the radio off and the light does change colors, but beleive it or not sometimes instead of the fail safe braking it goes to WOT:bling:
Once I seen that I knew that instead of a fail safe it would be a fail for sure. If I lose power it could go WOT and smash into who knows what. This thing is possessed by the devil. I'm gonna take it out in the grass and shoot it with my beretta.

 

[AaronBall]

I had to extend the wires on my Dynamite fail safe and locate it outside the receiver box. It was causing reduced range but was not quite as posessed as yours. Try some of the experiments I suggested or take the thing back. I have had better luck with a Mpi fail safe which appears to be a clone of the Futaba.
Its Friday, time for :beer:

 

[SkyMaxx]

This thread is yet another reason why I do not run a failsafe on my rides. More often than not, they cause problems of this nature.

From the sounds of things, you may have a compatibility problem. HiTec and Airtronic tend to get along well. Perhaps the warning about the Airtronics should be looked at as a bad sign.

I suggest removing the failsafe and making certain that everything works as it should without the failsafe. If it does, then reset the failsafe and try installing it again. Pay real close attention to the instructions with respect to proper set-up. If the funky behavior continues without the failsafe installed...or the funky behavior returns when your reinstall the failsafe, then perhaps we need to look deeper.

 

[robmob]

I run the Ofna ones and have not had any problems. I mount them on top, or next to the reciever box. I am also using the JR XS3 radio with RS300 receivers.

 

[spill]

Originally posted by SkyMaxx
This thread is yet another reason why I do not run a failsafe on my rides. More often than not, they cause problems of this nature.

In a word, "yikes".

I guess if you're in a wide open area, that's cool. More often than not, I'm not.

I have the Venom FS as well. No interference at all for me with the stock traxxas tq-3 stock Tx/Rx, and I even have it shoved into the receiver box/case on top of the receiver itself.

I did have a problem last week with my steering only being controlled by the throttle trigger... looked for shorts in my wires, tried each servo one by one in the receiver, replaced the receiver, changed crystals etc.

Turns out, it was the transmitter that finally crapped out on me... verified this by using my old crystals in a friend's transmitter (same TQ3).

Finding the problem is a tedious process of elimination, but this thread is the first time I've heard of failsafe's being a possible culprit in jittery controls (unless it's DOA itself).

 

[SkyMaxx]

To each his own...

If I were to do a search on this site, I'd be willing to bet I could turn up at least ten threads on the subject of fail safes interfering with proper radio operation.

Yes, they are tedious to trouble shoot. Yes, they might be worth the money. Until I get burned by not having one, I choose not to go to the trouble. So far, in more than several years of playing with RCs the only failsafe that I choose to use is a throttle return spring. And guess what, I have yet to have a runaway or any other problem with my rides. Kind of makes you wonder...doesn't it.

 

[Error401]

Good point Sky. As I stated earlier, I run one on my buggy, and none on my savage. The throttle servo I use on my Savage is a Futaba 9403. It's coreless and high speed (meant for aileron use on aircraft and is kind of overkill for the savage), but it has a really low resistance to turning w/o power or signal from the Rx. The TRS I run is more than adequate to do it's job, and I have had it work before. One time my Rx batteries ran down, and it would just go to idle sporadicly until I put new batteries in. The other times was when someone on my channel switched on, and it did the same thing. Alot has to be said for the radio here. The JR XS3 that I use doesn't freak out when it gets two signals, it just stops responding and lets the servos ack like the power is off. The 27 mhz AM's are the worst for freaking out. So, all in all, my sum total of experience has been one of not needing a FS (so far), but I do run one on the buggy where there is no TRS installed.

 

[spill]

By all means, if you have other means of stopping it (return spring), cool... or if you're better at maintaining your truck/car/buggy than someone who pulls it out every once in awhile and are confident in a runaway never happening, great. I didn't mean to start a pissing contest here by any means.

I've not had any problems with the Venom device. No jitters or weird behavior... simple throttle closed action. I have a return spring, but haven't taken the time to try to find a good way to hook it up to Sirio's linkages on my maxx... I'll probably wait until I have something stronger/quicker than the stock throttle servo in the truck, anyways.

 

[Çh®i§tiªñ]

Some guys take out the fire and glass riders on their car insurance and others dont......

Anyhow, out of 7 failsafes purchased, MPI, Venom and XTM being the brands, I have had 2 bad ones that had the same effect as what you are talking about. Took them back, got new ones and everything was fine.

I run NiMh packs in everything I own, Venom or MPI failsafes, Novak Synth RX's and all Hitec servos. Some digital. All with no problems.

I have heard of some brands not working with others. But I can't say for certain in your case. You may be better off contacting Horizon Hobby to find out if that may be an issue (they are the company that represents Dynamite)

For the 2 times my failsafes kicked in and worked, they have been worth every penny. I have wayyyyyyyy toooooo much money tied up into most of my rides to not spend the extra 25$ and take a gamble. When you put thousands into some of your cars......

On the other side of that coin is the HAVE TO HAVE mechanical failsafes as well. Throttle return springs etc.. Dont forget, mechanical failsafes cannot overpower a servo locked in any position and an electronic failsafe cannot do anything when there is a complete loss of power.

BOTH are the smartest way to go.