Some of my planes have it inside the fuse and others outside. Personally I prefer it inside for esthetics. But recently I built up an MK 90 size pattern kit with the wire inside and lost control on my maiden flight(radio failure). Every single part of the plane was brand spankin new including the YS 110. I must point out that I used carbon rod for all control. Whabam!!!! The only thing that I was able use after the crash was 2 servos the rest were totalled.

In less than a weeks time I got another MK kit and again brand spankin new hardwares, YS engine, etc.... Same carbon rod set up as the previous plane. Lost it again on the maiden flight due to radio failure.

Swore to myself that would be my last pattern plane. The pattern gods were not on my side. Eventually after a month I got another 110 size pattern plane and made sure to install the wires outside. Everything went smoothly and no more radio failures for me.