I have the strangest twitch I've ever seen in my life with my Eclipse 7. With 4 servos installed in my glider wing, whenever I quickly move the ailerons from left to right, the flaps start twitching and eventually my elevator and rudder also join in to add to the fun. Finally all of my servos will freeze up in a maximum throw position. I figured it was the either the transmitter or receiver batteries and made sure both were charged. To make matters even stranger, I found out that if I used my lipo with a voltage regulator or an old Nicad pack, there was no twitching at all regardless of what I did. As soon as I used ant 4 AA NiNh's again, the problem came back. Then I figured I'd change receivers and channels. All of my receivers did the same thing regardless of the channel. I figured maybe it was my long servo wires going through the wings so I just tried different servos plugged directly into the receiver....no difference at all. So I've concluded that it must be some sort of voltage issue since the problem only happens with my NiMh's. Right now, I have the lipo in the fuselage and everything is fine. I've never had any problems with this transmitter before for 2 years with all kinds of planes so I'm totally baffled. If anyone has ever seen anything remotely similar to this or have any suggestions, please let me know.

I have heard of it with NiMH bats quite a bit. Seems to me it was only when they were fully charged. Guess I wouldn't use them in the radios it they are causing this problem. I would never trust it.

Nimh batterys don't flow as much current as Nicads.

I have recently added 2 batteries and 2 switches to my larger planes.
I did this because I installes a battery monitor and when 3 or more servos were opperated at the same time the voltage dropped to an unsafe level, I was using 2400mah nimh batterys.

I was told that the plugs could only handle 1.5 amps max.


Ralph

seems like i got something kind of like this myself. the aileron servos in my spirit elite glider buzz a bit at idle and i cant really find a reason for it. the limkages are ok and this happens even when the linkages are taken off. only the aileron servos, both sides. all the rest of the servos behave perfectly normal. the setup is hitec 8 channel rx, expert servos (look a lot like hitec 81s) and a 4 cell nimh pack. eclipse tx. happens as well with a 4 cell nicd pack. i know sometimes a servo will buzz a bit but this seems excessive to me and why the aileron servos only? the ailerons operate normally and the only symptom is the buzzing. i may do a check and see if there is high current draw. if not, i guess i wont worry too much about it. its just odd. chillybee's issue sounds like a low voltage issue to me. another thing, the connectors that we use i think are pretty poor. when i charge a rx pack at much over 1 amp, the plug gets warm.

Your problem is the NiMh batteries can not supply enough current without dropping in voltage. You need a scope to see this. If you put the scope across the switch you will see a voltage drop. You can not see this with a meter. A meter is just too slow and does averaging. NiMh batteries have a high internal resistance, Nicads do not. NiCads can supply a big current peaks without a voltage drop like NiMh will do. To me NiMh batteries are great for transmitters and some uses in a receiver set up not requiring a lot of current peaks. There are some high end NiMh packs that can deliver the current but still not near as good as a NiCad can.

Pete