Sunday, December 15, 2013

Mirage Drive System - Observations

The Mirage drive appears to be using a batoid inspired oscillating propulsion system, a biomimetic model imitating the movement of a manta ray. The flexible fin mates well to human powered pedals and allows for a smooth thrust with limited turbulence. The efficiency of batoid propulsion has been investigated by the military for obvious reasons.

Full Mirage Assembly

linkage detail

fin types

 Below is an abstract from the Journal of Fluid Mechanics exploring efficiency and turbulence in this type of system.

On the relationship between efficiency and wake structure of a batoid-inspired oscillating fin

Peter A. Dewey,Antoine Carriou and Alexander J. Smits (2012).
Journal of Fluid Mechanics, Volume 691, January 2012 pp 245-266
http://journals.cambridge.org/action/displayAbstract?aid=8474648