Dragonfly concept and Modelling
WITT ‘DRAGONFLIES’ are a great solution in developing and emerging economies, our Unique Selling Points are:
Low centre of rotation transfers moments to the ground better
Light and easily deployed/assembled for remote locations
‘Wings' can be made of fabric and easily ‘trimmed' for different conditions
Works with low wind speeds
Generator and assembly close to the ground, no special equipment for maintenance
Modelled using computational fluid dynamics, ‘Orcaflx' - initial results below.
Can be up to 3.5 m length wings – larger sizes are possible…..under investigation!
Aesthetic-wings/sails could be multi coloured or camouflaged
Rudder can be disengaged so the ‘dragonfly' turns to the wind at higher wind speeds or ‘wings' can be removed/furled
Main body can be secured to the ground/base structure to prevent theft, whilst fabric superstructure would be inexpensive and worthless without the generating system
Dragonfly modelling by Simon Hindley Solis Marine
Wind speed is 10m/s and playback is real time. The main body with wings when ‘flipping’ does so at about 2rad/s, the yaw rate is about 1.5rad/s. The wings move over a range of 70deg and the yaw motion is +/-40deg (range of 80deg). The rudder angle is proportional to the rotation of the wings around the main fuselage.