DarkEnergy
RCTalk Basher
- Messages
- 40
- Reaction score
- 0
- RC Driving Style
HPI Savage SS built myself
Relevant parts:
JR Racing RS300 receiver
JR Racing Z590M
IMEX Fail Safe No.5000
I just replaced my 4AA cell pack with a 1200 NiMh and I haven't sufficiently tested this problem it with the old battery pack.
Long story short, my truck went wot and I had to chase it down and wrestle it to the ground just short of darting out into traffic. This was almost 100 feet from where I was playing. First it oscillated full wot and 1/2 wot for about 20 seconds, then it just layed it on full until I was able to stop the engine. Holy CRAP it was scary! I had partial control of steering in brief spurts as I chased after it.
Turns out it was the FAIL SAFE that caused the full throttle. With the engine off, I am able to reproduce the issue as the battery dies. The fail safe works correctly when transmitter is turned off (snaps to exact position I set).
When I remove the fail safe, the throttle stays solid with much less power left on my battery. I can play with the servo for another few minutes on the same charge and, while it becomes somewhat erratic right at the end, it never yanks over to full or oscillates.
The battery died before even a single tank. I'm wondering what is causing such high drain. I have a HiTec servo for my steering that is very beefy (sorry I can't remember which model# it is but its pretty much the highest end possible for steering - its "that one"). I'm also thinking it might be the fail-safe that causing drain because there seems to be more power available to the servos when I do a test with and without.
A different fail-safe, the futuba micro fail safe, has this note in the description:
One last note: I remember when first setting the fail-safe, it was actually set on the opposite end of the servo. Since servos can reversed depending on the orientation of the installation, does the fail-safe account for this? It almost seems like the servo uses the set position for reception problems but the "default" position for voltage problems. The way it was oscillating almost makes it seem like the two fail points were fighting as the voltage spiked up and down.
Sorry so long... Comment and recommend me a proper fail-safe. This thing almost caused me a heap of problems.
Relevant parts:
JR Racing RS300 receiver
JR Racing Z590M
IMEX Fail Safe No.5000
I just replaced my 4AA cell pack with a 1200 NiMh and I haven't sufficiently tested this problem it with the old battery pack.
Long story short, my truck went wot and I had to chase it down and wrestle it to the ground just short of darting out into traffic. This was almost 100 feet from where I was playing. First it oscillated full wot and 1/2 wot for about 20 seconds, then it just layed it on full until I was able to stop the engine. Holy CRAP it was scary! I had partial control of steering in brief spurts as I chased after it.
Turns out it was the FAIL SAFE that caused the full throttle. With the engine off, I am able to reproduce the issue as the battery dies. The fail safe works correctly when transmitter is turned off (snaps to exact position I set).
When I remove the fail safe, the throttle stays solid with much less power left on my battery. I can play with the servo for another few minutes on the same charge and, while it becomes somewhat erratic right at the end, it never yanks over to full or oscillates.
The battery died before even a single tank. I'm wondering what is causing such high drain. I have a HiTec servo for my steering that is very beefy (sorry I can't remember which model# it is but its pretty much the highest end possible for steering - its "that one"). I'm also thinking it might be the fail-safe that causing drain because there seems to be more power available to the servos when I do a test with and without.
A different fail-safe, the futuba micro fail safe, has this note in the description:
The discharge curve of alkalines and NiMH cells is different from that of the NiCd cells for which this unit was designed. Non-NiCd cells will not provide the warning at the appropriate time. Does not work with transmitter in PCM mode.
One last note: I remember when first setting the fail-safe, it was actually set on the opposite end of the servo. Since servos can reversed depending on the orientation of the installation, does the fail-safe account for this? It almost seems like the servo uses the set position for reception problems but the "default" position for voltage problems. The way it was oscillating almost makes it seem like the two fail points were fighting as the voltage spiked up and down.
Sorry so long... Comment and recommend me a proper fail-safe. This thing almost caused me a heap of problems.
Last edited: