secondary stream of ambient air with the lower energy air stream via a mixer and an ejector sequentially downstream of the rotor mixing the secondary air stream with the lower energy primary air stream inside the ejector produces a series of mixing vortices due to substantial non uniformity of at least the turbine shroud downstream of the impeller and creates a transfer of energy from the secondary air stream to the primary stream a directing the primary air stream after rotating the impeller in the turbine shroud away from a rotational axis of the impeller and b directing the secondary air stream after entering the ejector shroud towards the impeller rotational axis while the preferred rotational axis of the impeller is illustrated as being coaxial with a central longitudinal axis of the shroud the impeller 39 s rotational axis need not be so for purposes of this method unlike gas turbine mixers and ejectors which also mix with hot core exhaust gases applicants 39 preferred method s entrain and mix a secondary stream of ambient air i e wind exclusively with lower energy air i e a partially spent primary stream of ambient air which has passed through a turbine shroud and rotor applicants believe that their preferred mewt embodiments 100 200 300 400 and 600 and applicants 39 preferred and alternate methods described directly above can consistently sustain with sufficient winds operational efficiencies beyond the betz limit for days weeks and years without any significant damage to the turbine in other words applicants believe their preferred mewt embodiments 100 200 300 400 and 600 and applicants 39 preferred and alternate methods described directly.