ORIGINAL: bikermonkey
Hey guys. I have a T-rex 500 all stock. Recently I bought two lipo 2600 6s 40c's, but have been flying 4400 5s 40c's. .. Here is the issue, the 6s seems to have a higher head speed, it's actually squirrely, and after 4 minutes the moter begins to surg,, you can hear it and see the effects of the head speed going up and down. It's done it with both batteries and now it does it even with the 5s batteries,,all after about four minutes. This nearly caused a crash. The 4400's would fly 9 minutes beforehand. Does this seem to be perhaps the esc going ape? Anyone had this up and down surging of the moter before.?
Hi and welcome BikerMonkey!
I have a Trex 500 stock and I fly in Stunt mode (wide open). The surge can be many factors from head bearings dying to the ESC dying.
I make certain to not fly over 2600 on head speed (from membory but look at the manual to be certain).
EDIT: Check distance between your main gear and pinion!
IHTH!
All the best!
b