Electric contra-rotating motor
I recently found this motor, seems light for a contra-rotating unit at only 640g. I don't think we need the motor mount but the spinner is quite heavy (can be replaced though).
Here's the link to the manufacturer page:
[link]http://www.gsmodels.com/en/products010.html?proTypeID=100097247&proID=101312967&fid=100080417[/link]
I'd like to give it a try but unfortunately i couldn't find where we can actually purchase this motor. I sent an e-mail to the manufacturer asking for more details but didn't receive an answer yet.