ORIGINAL: bruce88123
The other problem with soldered connections is the solder itself. The solder "wicks" up the wire a small amount and the point at which it stops is a transition point where the wire changes from stiff to flexible. It's at this point where breakage can occur. Applying heat shrink to the wire beyond this point will prevent failures as well as prevent short circuits.
What he said is right on especially in the high vibration environment of an RC plane. not to mention the corosiveness of glow fuel.
I happen to now a lot about fuel corosion as I got a $140.00 lesson when I accidently sprayed my transmitter with fuel... it is toast!
but now I have a spare TX battery and antenae!!