Microlighters

Have a look on YouTube and found this - Microlight weightshift with twin prop (seems with 2 motors)

Pilot seems to start 2 motors on each side.

How does the 2 props work - is it a shaft in a shaft for each.

http://www.youtube.com/watch?v=u8QE8gBQN3w

Probably two lawnmower motors. Perhaps two being needed to be able to provide sufficient power for two people. I would say the left one is a direct drive and the right one, belt. Not sure how successfull this would be, one prop would be disturbing the airflow on the second.