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hello bigamous,

Stepper motors produce a high voltage output for relatively low rpm, If i used a motor from an RC car for example I would have to spin the motor a lot faster to produce the same voltage, spinning the turbine faster is ok but it produces significantly more stress on the machine and higher vibrations and in plastic thats a worry. On the MKIII i've improved the structure to allow for higher RPM x3 relative to the MkII without any vibration issues so perhaps a DC might work? Please try it and let me know how you get on! I'd certainly switch if I knew it would produce more power :). The MKIII is designed in such a way you can pretty much fit anything to the back end with only limited changes to the turbine for example i've tested an NEMA11/17 & 23 without changing much at all.

MkII to MkIII unchanged parts are below, i've redesigned or modified pretty much everything to be honest to squeeze as much performance out of it whilst reducing the cost, I've totally got rid of the purchased tower bearings and design a printable taper roller location bearing as an example.

Tail fin body
Tail airfoils
Tower footer
Nose cone & tip