1 minute Video:  Nymbus test flight at U of C,  2013
eVader 6D
grgress aux ucalgary pointe ca  .........research
info@gressaero.com  ...........all other inquiries
eVader 750
Video: Propellers as CMGs & momentum wheels
for 3D attitude control in air and outer space
Nymbus and eVader 6D on display at Ottawa's Aviation and Space Museum, 2012
Oblique Active Tilting paper AHS - Gress
Gyroscopically Controlled Air Vehicle - Thorne
Multirotor UAV with Tilting Rotors - Segui-Gasco
UAV having Two Tilting Rotors - Kendoul et al
Some of the aircraft designed by
Discovery Channel (Daily Planet) segment on Gary's aircraft and their control (2007)
(CMGs = control moment gyroscopes)
Nymbus 650
Video: Nymbus at Lake of Two rivers, Ontario, Oct 2011
Only two rigid, non-cyclic propellers are required for
hover if they are treated as CMGs (control moment
gyroscopes) and momentum wheels.  

The new control moments produced are independent of
distances to the aircraft center of mass, and, of course,
are independent of the atmosphere.  Yes, they can fully
control an aircraft about all three axes in outer space,
which translates to exceptional maneuverability and gust
resistance here on earth.
Related theses and papers:
Enhanced Control using Propeller Dynamics
Gary's artwork at Fine Art America
5 minute Video: Nymbus composite, Ontario, 2011
Test stand at U of C lab, 2014.
Gary's artwork on Facebook
Developing Nymbus 650 for
Gary Gress
Design Optimization and
Non-Cyclic Rotor Research,
University of Calgary
Passive Stabilization of VTOL Aircraft - Gress  M.Sc. thesis