I have always wondered if a wire drive really has an advantage over a flex cable so I did an experiment. I made both a 0.062 wire drive and a 0.150 flex cable for my JAE 12 rigger. This boat has an OS T1202 engine and weighs 2.0 lbs. The strut runs 4 ball bearings with each shaft type and the shaft lube is castor oil. Fuel was 65% nitro with 15% oil, 3% of which is castor and the prop was a 1516-17-45. I have a Futaba GPS inside the radio box. The water was flat with no wind. The first run was with the wire drive and the top speed was 73 mph. Then I put the flex cable in with no other changes and the top speed was 68 mph. Then I went back to the wire drive and again got 73 mph. So the conclusion is that with this boat and engine, the wire gives 5 mph over the cable. The advantage would probably be much smaller on bigger boats with more powerful engines. In the case of the 12 engines, every bit of weight reduction and friction elimination pays dividends.