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Unbelievavle Wreck - LST2

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IBinSaneDiego

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After weeks waiting for new parks, then strip the head button (but got another one at the LHS) I was out running it in a large parking lot, and everthing was working perfectly. Then after a couple of tanks, and more adjustment, it would hesitate/ brake on it's own while trying to accelerate. I had earlier tested and found the fail safe to be working. And as I was going at a moderate speed in a large oval, it took off straight ahead (without any hesitation/braking) and went head on into the curb. Had no steering, so I turned off the TX so that the fail safe would kick in, but had no effect. There was no one else with a RC in the area accept a Electric Airplane. I had been over in that area, designated for electric airplanes and found that they do not use channels 61-90... I was on 65. I swear I felt like someone did it to me??? Major damage.... frame rails, maybe the steering servos, various supports, linkage...ect.
 
your rx battery may have came loose or went dead.


ether way POST PICS!!!!!! you know we get off on carnage!!
 
really sorry to hear that
were you useing the 4 AA pack ...sounds like a battery came loose, the failsafe can't work if a battery pops out
 
Both TX/RX are rechargable. Testing it now, and the throttle/brake servo works fine for only the throttle, but it won't apply brake, either when applied thru the TX, or when the fail safe is applied? Servo Failed?? causing it to go full throttle?
 
yeah but you'd think because of the design, the spring would have pulled the throttle closed if it lost signal. very strange, that really sucks. It sounds to me like a channel mix up with the plane.
 
IBinSaneDiego said:
Then after a couple of tanks, and more adjustment, it would hesitate/ brake on it's own while trying to accelerate.
Click to expand...

The only thing that goes through my newb mind is the pack(s) lost charge after all that running around. That doesn't explain the fail safe not working though:ponder2:
 
Same thing happened to a friend of mine. His buggy all of a sudden went WOT and slammed into a curb. We later found out that the batteries in the buggy slipped off and that why it wasn't responding.
 
Earlier when it was driving ok, the reverse servo woudn't work? And still won't work. When I turn off the RX the throttle servo goes full throttle, when it should go full brake. I took out the fail safe, and it still goes full throttle. But with the additional dammage, who knows. Going to charge everthing up and test again.
 
I tell ya, man. From what you describe, either the battery unplugged itself just enough to lose power to the RX or you got some interference. I think it was the latter, personally, judging by what you've described driving near.

Either way, still bites!
 
Gave the RX battery some juice, and now the throttle/brake servo is working correctly... it will now apply the brakes. And when the RX looses the TX signal the brakes come on using the fail safe. But the fail safe will not apply the brakes when the RX is turned off (as in battery dropped below 4.0 v).
Also verified that the TX is working correctly. Moved the throttle/brake servo to the Aux slot (reverse) and it works... RX working correctly.
Could not get the reverse servo to work in any RX slot.

So a combination of the reverse servo failing, maybe caused a voltage problem preventing the fail safe to work???? Problem with the fail safe too?

Got it torn apart, got a list of parts, hope I can get it back together correctly.
 
So in English....the batteries was dead but the fail safe didn't work due to the batteries being to dead or disconnected?
 
Well as soon as I retreived the remains of the truck, I gave the servo's a quick test, and there was still some juice left. So the Fail Safe failed to
stop the truck at the low voltage, and the throttle went full at the same time. I'm going to be an expert soon on tearing down/rebuilding the LST2.
 
What FS are you using? What receiver are you using? What servo's are you using?

More or less, I'm just curious. I've had similar experiances when something gets wet and/or the receiver pack dumps. Even with a FS these two problems don't get caught by a FS. The unfortunate thing with NiMH packs is that when they die, they die fast. If you shut everything off for a few minutes and turn it back on, stuff will work for a little bit then stop working again.
 
olds97_lss said:
More or less, I'm just curious. I've had similar experiances when something gets wet and/or the receiver pack dumps.
Click to expand...


You're not lieing....It's not just an RX pack but my Mini T's die almost right away once I get them wet. Also I'm curious since I just bought me a FS for the Revo.
 
What failsafe? Some dont protect as well as others in freq. conflicts. Get a throttle return spring on that thing!!!!
 
Truck - LST2. RX JR3000, Steer Servo Z590M, Brake/throttle/reverse servo Z270, fail safe - dynamite

My new deduction of what happened. When the truck was acting up, that is, when it kept wanting to stop itself (That was the fail safe trying to stop the truck because of low battery) but since there was enough juice to transmit a signal to the RX in trying to give it throttle, it would start going again. And when the battery went to the lowest point, it caused the throttle servo to go full open and the servo would not apply the brakes.

But none of this explains why the Z270 servo controlling the reverse function failed... which I had tried to use earlier when it was running with juice.
 
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MOst FS's need to be programmed to go to the mode you designate when the batt gets low or the signal gets cut off. Silly question, but did you do the set up properly?
 
I had it set correctly when I first got it ( last month), and even tested the fail safe when I started the day it crashed by turning off the TX. The loss of signal/low voltage settings are the same.
 
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I feel ya.

I just had a huge crash also, I snapped or tweaked almost every thing. I bent my front center dogbone in a 30 degree angle, and broke a CF radio tray in 3 places. and what pissed me off the most, I had a Failsafe (almost new and in great con cheaked earlier that day), throttle return spring, and freshly charged batteries in both the RX and TX. and I still had a run away.
 

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