Kitewinder

by Pierre Benhaïem in Airborne Windenergy Forum · · 6 Replies · View last reply Respond
Pierre Benhaïem
Pierre Benhaïem

https://kitewinder.fr/ : Olivier Normand realized a new design for a nice AWES with a loop-belt and designed for nomadic uses.

Gordon Spilkin
Gordon Spilkin

Kitewinder is a very good system for creating small amounts of energy.  Unfortunately scale-up is a severe problem.  For example to generate 10 kW of power we require a lifter kite of area greater than 40 sq. meter.  A lifter kite this size is dangerous to launch and retrieve in moderate to high winds.  The large kite is required because tension in both ropes of the cable drive must be maintained while power is being extracted.  Operating the lifter kite in crosswind mode would increase the lifting force, but operating in a figure-of-eight pattern would result in uneven pulling forces.  Perhaps a circular crosswind pattern would be satisfactory.  In any case, crosswind would require a  "Kite Control Unit" which is complicated.

Alexander Muzhichkov
Alexander Muzhichkov

This is a common misconception, the AWE system can easily be divided into many small devices without a significant increase of costs.

Pierre Benhaïem
Pierre Benhaïem

As the AWE system is divided into many small devices, as the tethers are numerous, increasing the tangle risk.

Alexander Muzhichkov
Alexander Muzhichkov

That's right, but if we speak about stationary AWE-system, each of them is relative stable.

Gordon Spilkin
Gordon Spilkin

The system I propose consists of a grid of multiple lifter kites linked together.  They are maintained in place by diagonal stays around the perimeter so the distance between the kites remains constant and the whole system is stable. Each lifter kite has its own set of turbines and a cable drive system. There is little chance of tethers and cable drive systems entangling.  The whole system is launched as a single unit and the diagonal stays must remain taut during the launch to prevent kites from colliding with each other and the tethers/cable drives from entangling.

Alexander Muzhichkov
Alexander Muzhichkov

It sounds good if want to solve a problem with a low wind in some point of kite filed. But we suppose that AWEs fly quit high and on this altitude wind is quit strong to achieve good result. It means also, that a gap of wind velosity is from strong to very strong (for example, form 10m/s till storm). So, the problem of falling down is not actual. If you have very strong wind connections between kites to avoid tangling does not help. The problem is to safe all the system. I mean, if we have a deal with a nature, we have to be very carefull with it potential.

Other problem with between connections is to start all the kites together. I can not imagine hoe to make it.