I guess you can make that 4 divers. I got mine when I was 21...that was 30 years ago. I had a RMSS XXI but decided to get the one that Doug Badgley sold. Its now a Thor kit. I did my rudder very different and it was quit easy. As suggested by out VP I did it with cogged belt. Like used in Skips 3:1 motor reduction. The small gear fits very nice in the back of the boat and the larger gear is in the front .