The Quad Thrust Aerial Robot (QTAR) was my (Joshua Portlock's) final year Mechatronic Engineering Project in 2005 at Curtin University of Technology.
It is a quadrotor VTOL UAV with a 200 gram payload capacity and 15-20 minute flight endurance (depending on battery capacity and payload). I designed the attitude estimation and control system, which controls the pitch and roll angles within 15 degrees from level hover.
I undertook one year towards my PhD in VTOL UAV related research before beginning a career in the Aerospace R&D industry.
Feel free to contact me if you have any questions or want to share some knowledge about VTOL UAVs.