Fig. 1 shows a submerged experimental electric generator of high power (above 500 kW) having an exterior rotor and an internal stator. For testing purposes this generator has to be rotated a long period of time by a 1500-RPM, 1000-HP electric engine.
The question is: Will a (stainless steel) underwater gear, like in Fig. 2, formed by a 1500 RPM pinion and a ring cogged wheel 20 time its diameter (bolted to the rotor), work?
The speed of the pinion will be 25 rotations per second and that of the ring just 1.25 RPS. The outer diameter of the generator is of the order of 1 meter. In some tests the water will be mixed with small quantities of sand.