1. Proprietary Information ©2008 Viryd Technologies All rights reserved. Slide 1 Wind Turbine and Drive Train Development Project Presented by: Dennis Hechel Viryd Technologies dhechel@viryd.com 512-565-1560 www.viryd.com www.fallbrooktech.com

2. Proprietary Information Slide 2August 2007 Influence of TSR on Power Output Power in the Wind P wind = 1/2 ρ A V 3 Johnson, Gary. "Windbook.pdf.“. Dr. Gary Johnson's Renewable Energy and Tesla Coil Page 8 Mar. 2008. 10 Aug. 2008 <http://www.eece.ksu.edu /~gjohnson/>. Optimizing Cp Power generated = Cp x P wind – Cp is maximized when TSR is optimum – TSR is the ratio of the speed of the tip of the blade, to the speed of the wind

3. Proprietary Information Slide 3August 2007 Generator speed optimization Synchronous generator – Generator speed is constant – Power maximized if rotor speed varies with wind speed -TSR constant Asynchronous generator - induction – Generator speed varies a little with power output – Power maximized if rotor speed varies with wind speed - TSR constant DC generator – Generator speed variation produces voltage output change – Wide voltage changes requires wide input range inverter – Speed variation pushes generator off optimum efficiency – Power maximized if rotor speed varies with wind speed - TSR constant All Wind turbine architectures benefit from the rotor operating at optimal TSR

4. Proprietary Information Slide 4August 2007 NuVinci ™CVT Design CVT consists of rings and rotating balls. Operation Tilting balls changes contact diameters on each ring Resulting in output/input ratio changes Provides smooth shifting No gears involved. Allows generator speed to remain constant while rotor speed changes.

5. Proprietary Information Slide 5August 2007 CVT Range Approximate 0.5 to 2.0 ratio variation (factor of 4 ratio change) Allows rotor speed variation by 4 to 1 Control Electromechanical

6. Proprietary Information Slide 6August 2007 Drive Train Design Synchronous generator – rotor - gear box - CVT - synchronous generator – rotor - CVT - multi-pole synchronous generator Asynchronous – induction generator – rotor - gearbox - CVT - asynchronous generator DC generator – rotor - gearbox - CVT - dc generator – rotor - CVT - multi-pole dc generator

7. Proprietary Information Slide 7August 2007 Laboratory Testing Component arrangement Drive motor with gearbox - torque shaft - gearbox - torque shaft - CVT - torque shaft - induction generator Instrumentation Torque shafts, speed measurement, temperature, voltage, current, power Control NI Labview - Daq's - contactors - relays - servo loops - software

8. Proprietary Information Slide 8August 2007 Laboratory Testing Test sequence – Generator characterization – Component efficiency measurement – System control algorithm development – Wind profile input – Field operation control simulation – Durability under simulated real world conditions Wind simulation – Wind speed profile development – Rotor speed - wind speed - torque database – TSR optimization control – Dynamic stall control using CVT to maintain constant output power – Total system simulation

9. Proprietary Information Slide 9August 2007 Laboratory Testing Test results – Component characterization – Efficiency measurements – Control effectiveness – Durability & Reliability – Thorough preparation for field test

10. Proprietary Information Slide 10August 2007 Field Testing Test sequence Rotor data collection to verify optimum TSR versus wind speed Verification of closed loop control Data Analysis Wind profile data Energy generated Control stability System efficiency Validate Benefit

11. Proprietary Information Slide 11August 2007 Marketing Viryd Technologies Horizontal AxisDrive Train Wind TurbineSolutions

12. Proprietary Information Slide 12August 2007 Proprietary Information Notice This presentation and the information contained in it are the exclusive property of Viryd Technologies Inc. or Fallbrook Technologies Inc. and are protected by one or more of copyright, patent, trade secret, trademark and other laws. Any reproduction, distribution, or modification of any of the content of this presentation or any of the information contained in it in any manner without the express written permission of Viryd Technologies Inc. is strictly prohibited. Viryd Technologies and its associated logos are trademarks or registered trademarks of Viryd Technologies Inc., and all rights are expressly reserved. NuVinci and Fallbrook Technologies Inc. are registered trademarks of Fallbrook Technologies Inc.

13. Proprietary Information ©2008 Viryd Technologies All rights reserved. Slide 13 Viryd Technologies Inc* www.viryd.com *subsidiary of Fallbrook Technologies www.viryd.com Presented by: Dennis Hechel Viryd Technologies Inc dhechel@viryd.com 512-565-1560