The principal assumption of the Betz model (for calculating of the best free flow turbine efficiency) was that the fluid flow remains rectilinear when passing through the turbine and maintains a uniform distribution of the fluid pressure on the turbine. In reality, the fluid streams are deflected from the rectilinear direction near the barrier. By taking account of the curvilinear trajectories for the streams and flow redirecting, one obtains a more correct turbine power and efficiency limit. In addition – if incoming flow is using not only one time but twice - Betz efficiency of 59% is not a limit. Jet blades and respective turbine is using the energy of incoming flow at least two times. That is why the theoretical efficiency is as high as above 80%. In reality the efficiency of well designed JET rotors is possible to increase up to 2 times in comparison with non-JET blade turbines.

Based on new invented ROTOJET fluid kinetic energy converters are developing number of wind JET rotor designs. Each of them is full scalable. JET rotor/blades concept require new line of airfoil cross section, new plan form, new pitch and twist designs, new hub etc. In addition we have developed complete new ROTOJET power system "flow - blade - rotor - drive train - electric generator - power controller/inverter" . ROTOJET power system design is easy tailored to the specific flow conditions (velocity, turbulence etc.) to achieve much better system capacity factor. Thanks to the additional JET mode of blade rotations new designed turbines can increase the turbine efficiency many times (see videos at www.b2b.bg/new.html )

The new invented Wind-PV synergy energy system exploits a passive ground based PV-modules supporting structure as an wind accelerator directed accelerated  wind to the swept area of the wind turbine JET blades. This invention is applicable as an upgrade of the turbines operating in Wind Farms, as well. The hybrid systems, generally, is better energy source from energy-system point of view. Another invention related to low cost energy storage system is applicable to all renewable power plants.

Wind-PV synergy energy system is easy applicable even together with existing renewable energy facilities/plants/farms. E.g. - Wind-PV synergy energy system is useful for any wind turbine and any manufacturer can incorporate PV-supporting ground structure around vertical mast of his horizontal axis wind turbine. In low wind speed areas is possible to increase wind turbine energy yield above 50%.

For some applications of ROTOJET power system is possible JET rotor upgrade / retrofit of the conventional rotors.

By new invented JET wind turbines is quite possible to double turbine power output of both axial and cross flow turbines (with same rotor diameters) at low wind velocity. Also is possible to reduce turbine spacing in Wind Farms and to guarantee the same overall energy yield as by non JET wind machines. See a comparison in operation of JET turbine vs. conventional turbine at: http://www.youtube.com/watch?v=ghp-7MqUyhs  

New invented end less JET blades of a wind / hydro kinetic turbine propeller

New invented (patent pending) end less JET blades of wind / hydro kinetic propeller. Blade tips of propellers create significantly energy loses and noise / cavitation. Newly invented JET blades avoid tip energy loses and and noise / cavitation. That is why new endless blades are much more efficient in the comparison with all known blades. Patent pending - see more at http://www.tonchev.org