1. micro-UAV-2004 Petter Muren, 2004-9-15 Passively stable helicopter

2. micro-UAV-2004 Passively Stable Helicopter  A small electric flying sauser hanging in the air over your desk, stable and silent – 20 years ago this was a mere dream.  Helicopters are considered to be unstable and difficult to control unless they are equipped with sophisticated sensors and electronics.  A passively stable helicopter - is it possible ?

3. micro-UAV-2004 The Proxflyer idea  The Proxflyer co-axial rotor helicopters utilize a new mechanical and aerodynamically approach to the challenge of achieving stability  The main benefits are: - Passively stable - Simple electronics without any servos - Relative simple mechanics - High efficiency, long flight times - Very easy to pilot - Very low noise level  Possible disadvantages are: - Relative slow forward speed - Not possible to operate in wind (outdoors)

4. micro-UAV-2004 The Proxflyer principle  The rotor have a generally fixed geometry and is tiltably connected to the rotor shaft  The outer part of the rotor blades have a pitch angle that is fixed relative to the rotational plane of the rotor  The inner part of the rotor blades have a pitch angle fixed relative to a reference plane perpendicular to the rotor shaft

5. micro-UAV-2004 The Proxflyer principle

6. micro-UAV-2004 The Proxflyer principle The Proxflyer Mosquito - Rotor diameter 36 cm - Weight 100 grams

7. micro-UAV-2004 Remote operation In August 2003 the Mosquito performed what is believed to be the first ever controlled flight where the pilot operated the helicopter solely by looking at a large video conferencing screen displaying the pictures from the helicopter Wireless Camera This makes a great introduction to a meeting: Filming the audience while flying overhead inside a conference room.

8. micro-UAV-2004 Toy helicopter Because the helicopter is passively stable it is also extremely easy to fly. It is actually so easy to fly that a child without any experience from helicopters or model airplanes is capable of flying it, even the first time they try

9. micro-UAV-2004 Proxflyer Micron  Presented in December 2003  Weight 6.9 gram  Rotor diameter 128 mm  2 ch. FM radi control  C.G. trimmed forward  Motor 6mm, 4.5 ohm  Tailmotor 4mm, 25 ohm  Flight time up to 10 minutes

10. micro-UAV-2004 Proxflyer Micron

11. micro-UAV-2004 The Nanoflyer  Presented in September 2004  Weight 2.7 gram  Rotor diameter 85 mm  2 ch. IR control  C.G. trimmed forward  Motor (2x) 4mm, 25 ohm  Battery 20 mAh  Flight time up to 1 minute

12. micro-UAV-2004 The Nanoflyer

13. micro-UAV-2004 Passively stable helicopter.... It is possible !