In the past few years, I have had a few
crashes that could have been avoided:
Make
sure the pick up tubing in the tank is free to move around and the clunk does
not hang up, especially if inverted.
Replace
the fuel line pick up tubing in the tank at least 3 to 4 times a year,
especially if you are using 30% nitro. The nitro makes the tubing spongy and
then it comes off.
Check
the switch harness wires around the switch case where the wires come out as
they chaff, and ultimately break off.
Check
batteries often, even if you think it should be ok.