Optimum thruster RPM?

[Terrence]

I understand that the RPM at which a thruster runs depends a great deal on the design of the propeller, but is there an optimum RPM of the motors that I should be looking at for a thruster? Too low of an RPM and I won't get any speed and too high an RPM will be too much, hard to control, and burn through batteries.

Pointers?

Terrence

[jsut210]

Well all that I can help with is the brushless motors typically from hobby websites. For these, the lower the rpm, the better. Realistically, any kv rating of less than 1000 should work well. If you spin your prop too fast, the water will cavitate and you will loose thrust. Generally the lower the rpms the bigger you can make your prop and the more efficient your ROV will be.

[ERIEWRECKDIVER]

I used model boat props from Hobby Barn and put them on bilge pumps. They were very successful.

ErieWreckDiver