OK I know that it's probably tough to make any certain predictions, but I'm just wondering if say, 30,000rpm is too fast of a speed for a prop to ever spin. I'm trying to pair up the correct KV motor with a hull and I have no idea what approximation to use. For instance, the predicted no-load speed of a motor is 47,000rpm. I'm guessing that under the load, this motor will achieve maybe 30krpm. I'm wondering if this is just too fast or if a transmission needs to be used here.

Thanks