Hey Guys, I have a little experience with this as I had issues before with using stranded audio wire for primary power wire in my car. While the skin effect is true, too many small strands cannot handle the amp draw and will fail and gain resistance. So its a balance between the number of strands and how thick they are.

Based on what your saying Solid wire did not improve your resistance, but I know from personal experience that solid wire is hard to work with in some cases and also it will break over time with the shock of landing etc without the flex.

In no case would I use a solid conductor unless it is permanent wiring like in homes where there is no movement and there is no risk to the wires. Your solid wires are going to transfer allot of vibration to your connections and you could break off a solder tab or something stupid, I do not recommend this. I have seen it happen before, just like the paperclip effect, you bend it too much it breaks. While I am pulling various non rc experiences into this, I am composing a conclusion that solid wire is not going to be good in the long run and serve no advantage now or later, but does introduce risk of breakage that you may not have experienced yet, but when it does could be an expensive breakage.

I think using 10GA stranded wire is fine for RC, but when drawing super high amps on something like a car starter you need to reduce strands and go to higher gauge strands.