Current Developments: 4 papers on Wind Turbine Anaylsis In late 2004 I started some analysis of Vawt's in trying to help two friends, Peter Sharp and Ray Pasquan with their Vawt designs. This generated a new method for solving momentum theory, which led to some new results for Hawt's as well. That shows that fixing Hawt blades at 1/2 the design apparent wind angle or 1/3 the design nominal apparent wind angle gives a broadbanded and benign design. Click and save as target to download my trigonometric Hawt analysis, with its optimal pitch Vawt appendix. The Hawt aspects are further developed with drag and tip corrections and a numerical example in a followup paper to be published by AIAA and a slide presentation. A third helps explain the physical basis of the BEM approximation by critically applying Glauert's presentation of Joukowski's general momentum theory of propellors to windmills. In my Vawt algebraic analysis , fixed blade Vawts are narrow-banded, caught betweeen unsteady stall at low speed ratio; and high drag penalty and over-induction and overloading with "turbulent" backflow at high speed ratio but robust cyclic pitch Vawts seem more promising. Taken together, the papers effectively justify,solve,and extend Glauert's original Hawt aside to his propellor theory with a properly grounded, and more conclusive and consistent BEM treatment of Hawts AND Vawts. A general advance is the general BEM energy flux equation to show that the induced velocity can only differ from half the velocity change in the direction of the apparent wind. The specific Hawt advances are: 1)Exact solution of Glauert’s optimum rotor 2) Posing,solution and understanding of a new robust optimum criterion 3)Drag and tip corrections to 1)&2) 4)Proof that normal wind regimes and windshear favour robust blade pitch over standard min drag to lift pitch 5)Reduction of general momentum theory to absurdium 6)More sensible simpler equations for swirl expansion and decay 7) Prediction of hub vortex bursting 8) showing that the ordinary BEM Hawt equations mean the dissipation of all the swirl kinetic energy added at the rotor And Vawt advances are 1)a Hawt-and-Betz- consistent 2 pass BEM Model 2)its analytic solution for tangent and passive pitch Vawts at high speed ratio 3)Proof that these Vawts are more narrowbanded than Hawts, even without stall 4) Cam profile for a robust cyclic pitch Vawt with the same height but broader power peak 5)Relation of isolated blade induced drag correction to Prandtl tip correction 2) Updated Pullpump for the Flutterwell The first Pullpump prototype on the Flutterwell was a successful testbed for the self-snifting capability. However the original pull pump configuration used custom seals handcrafted from plasticised PVC which were very exposed to abrading if not jamming with dirt on a less clean well, and could not retain the head over a calm night. The ultra-convenient foot pump PE rising main could not be obtained at the 4" size and semi rigid 20’ lengths with connections proved no easier than PVC, though a bit cheaper. The current second prototype incorporates the latest pull pump configuration developed on the foot pumps with off-the-shelf seals well protected from dirt . The dedicated static seal has to be spring-loaded to maintain its static conformability despite potential contact every time the pendulum passes through center . Ordinary leather foot valves do not statically seal completely after all the hammering of pumping, and this leakback of head can represent a major inefficiency for windpumps with the intermittency of the wind. In all pull pumps, the ultimate hardstop will be the bottom of the plunger against the bottom cylinder bush. Again to protect the static leather seal, the inner cylinder pipe has been changed from copper to PVC and for straightness and flow efficiency sdr 21 will be tried first. Raingun 4" PE tubes are very thick wall to take the high spraying pressures and to avoid buckling in the powered tight winding. The biggest size of continous thin wall PE available is 3" which is smaller than desirable. To get a 3" cylinder one could insert 3" thin wall copper DWV which is expensive and easily dented, or glue an exterior 3.5' metal bushing (eg. 3.5" copper DWV) to a 3" PVC cylinder. The bushing must be long for the PE glues and to bridge an internal gap where the shuttle seal/valve clears enough to drain the water column. Another bushing and gap may be needed above the highest static water level to drain any renewed water column as the shuttle is raised This system should allow one person to put the entire pump into a high yield 4" deep well even through the Flutterwell’s yaw bearing though the base will be redesigned to avoid this..