Any RC submarine needs speed, whether it's a research sub or a full scale military underwater steel monster,
the propulsion unit is a one of the main features of any boat. For a sea ravaging steel shark like the Nautilus, ramming
ships along the way, it's gotta have sort of a kick!
For the motor, I took it out from an old VCR and tried various battery voltages, a nine volt battery seemed
to be a good choice. The motor works with a direct drive to the propeller shaft and since it's a brushless motor, not
a lot of sound is generated.
Propeller is 3 bladed (although in the novel the prop is 4 bladed, I plan to change that in the future), I got
it from a plastic fan and painted it gold.