Towards a viable AWES


#1

There is nothing new in the following design, excepted perhaps later improvements.
It is a rotor with secondary turbines under a lifter. The electric transmission allows reaching really high altitude. The main rope is motionless in order to avoid a too big wear and protect the electric cable. The lifter is also a supplementary safety in the case of computer failure. The rotor allows a constrained figure being not exclusively dependent on the computerized control. The rotor scalability can be a concern but rotor blades for autogiro or helicopter have higher aspect ratios than aircraft wings, and are far lighter. Then suspension lines reduce loads. Critics and observations are welcome.


#2

Except for the lifter kite that is basically what

http://bladetipsenergy.com

is developing - and actually already flying. Since they do not have a force vector from the lifter they do need active pitch control though.

/cb


#3

Blades tips energy, a French company based in Grenoble try to do that since 5 years but without a lifter. I don’t think that could work without a lifter anyway. I know the guy, Rogelio Lozano. They already began to pivot 1 year ago to do a radio transmission tower. Might be not convincing enough to go on power production as it is a clissical pivot. Zéphyr solar, a helium solar ballon did the same thing 1 year ago.


#4

If you want to build a small demonstrator of the concept this toy:

might be a good starting point :slight_smile:

/cb


#5

The active pitch control of a rotor is complex and expensive. There are two possibilities of doing without: putting a lifter, or making a gyro kite with a body like this:

See also “Centrifugally Stiffened Rotor (CSR)” on


Turbines in the tip of blades take faster apparent wind and can be smaller. I don’t think that centrifugal force is so important in regard to wind force, at least as the rotor scales. So a relatively rigid construction can be better.


#6

IMHO http://bladetipsenergy.com is developing a good concept that could be suitable as an AWES. For that some possible improvements are a higher aspect ratio of the blades, the secondary turbines in their tips, adding suspension lines or bridles to counter the bending moment of the blades, and a lifter. After there are some interesting possibilities.

See also their yoyo concept: