Excellent, good photos can make all the difference in the world. Ok those plugs are the still current Hitec (s) plug also known as a JR compatable so apparently that green Futaba 'G' plug is just on the charger and someone just picked up the old Futaba charger. The only question but not likely is if the original owner spliced the G plug female on the switch harness to use that charger?

But lets move on from that for a bit. Is Hitec a good system and the answer is oh you bet and I am a Hitec user myself but there is a hidden problem with your system. Those are HS 300 servo's which were perhaps a mistake by Hitec and in my opinion the most problematical servo ever produced by Hitec. They only lasted a couple of years before quietly disappearing from the market Now new batterys are going to cost around fifty or sixty bucks and that's a must. The little Focus four was an much older borttom line entry radio and totally devoid of all the modern features and functions that folks now demand. So here is what will happen if you are someone who is just passing through then yes I would patch up the old system but if you are someone who is motivated and intends to really get involved Then you will soon be wanting to replace that system just like everyone does and it makes no sense to drop money into when new modern systems jammed with features and functions you will soon want are starting out around 150 to 200 bucks.

You have a good start with the engine and airplane.

John