It would work... but not recommended... though it should be ok for RC.

Another way would be to tin the two ends of the wire, then tin a piece of smaller 20ga wire. Butt the ends of the large wires together and put the 20ga wire next to them, and use it to bridge the pieces so you get plenty of solder for a strong joint. Or use a flat piece of copper or piece from a terminal lug.


The real question... why do you need to splice like that? Why not just cut to length and solder the connector directly to the wire?