Few years ago my grandfather passed away and he has all these rc boats he built himself. They all use the same motor for the propeller and steering. I believe they were remote controlled but I'm not sure how I can get them going. The motors battery connection is a large tamiya and he has all these old nicd batteries which I'm aware are very obsolete. There is a separate small motor for the steering with a small black connector with a black red and yellow wire all going to it. The thing I don't understand is if these are remote controlled how would the throttle be controlled of the propeller if it's directly wired to a battery. I am guessing the steering goes to some sort of wireless device maybe. I'll attach some pictures hopefully someone can understand. Any help is appreciated.